Pontiac OHC-6 Tear Down - Top End Failure
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- Опубликовано: 30 авг 2022
- I’m finally diving into my 1967 Pontiac Tempest project. Started by pulling the original overhead cam 6 engine and turbine 300 transmission to make room for the new drivetrain. The OHC6 was making some horrible sounds the last time I had it running, so I decided to tear it down and see what the issue really was!
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LS Swap
Ratty Muscle Car
Roadkill
Engine Masters
Hagerty
Survivor Car
Pontiac Overhead Cam 6
Pontiac Tempest
Patina
Hot Rod
Daily Driver
QA1 Suspension
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in 69 the sprint 6 made 230 hp which is very impressive for a 6 cylinder in 1969, especially considering the base model 326 V8 only made 250! in 1993 the Ford 302 that came in the mustangs only made 225hp that little sprint was making five more horsepower with 2 less cylinders and 24 years prior! that's pretty impressive!
My friend had a Sprint, and it was impressively quick for a 6 cyl. It had a 4 bbl and long runner intake manifold, cast headers, pretty cool if you ask me.
Pre 72 used gross horsepower anything afterwards was net. Gross HP was basically how Holdener always says he dynos an engine where as net is with the accessories, full exhaust, etc
Your a different breed Girl…And it’s Awesome. Always an Adventure. Keep up the good work, can’t wait for the next step !! 🤘🏻😎🤘🏻
My dad bought a 67 tempest in about 1969 and that 6 cylinder was a hot little engine. Very fun car to drive. I used to get up in the middle of the night and sneak it out of town and drive the hell out of it. I didn't have a driver's license yet. I've always loved that car and would love to have one of my own. I'd definitely want a 6
Cam failures were extremely common for this engine back in the day. The oils were just not good enough, and lack of timely oil changes sure didn't help. Also the TORX bolts, that was the first time we saw anything with those. The tool trucks in the 60's didn't have them, we had to chisel the bolts loose...ugh!
One trick to extending the life of the cam and followers was to avoid pressing the accelerator and setting the choke when the engine was cold. It was beneficial to crank the starter until the oil pressure light had gone out. That meant oil had reached the upper end of the engine. Then it was time to set the choke and fire her up.
Liv;
I love your stuff, but that car would be 1000% better with the ohc 6!
You make watching the video worth it!
Keep up the great work
Looks like the same wear on the cam and followers that happened to my Pontiac OHC . Glad you did the teardown, a made the effort to diagnose the noise !
Just watched your video for the first time I'm a retired mechanic and drive a 69 firebird, my wife also has a 69 bird as well mine is a 5 speed manual her's is a 4 speed auto I also drive a 58 Ford Fairlane manual transmission ,if you can learn to drive that Camaro like a motorcycle meaning the shifting it won't beat you up and it will be fun to drive,injoy Ed the content.
Great Program, the young lady is very well versed in her knowledge of engines and there direction is very well grounded. Thanks for picking this car because I had been interseted in the grand prix
not realizing that the was before the grand prix became popular.
Happy see the OHC6 being saved, but years ago when I looked at building one of these, I couldn’t find a cam anywhere. Of course this was before the interweb.
Glad to see you guys are doing a collaboration with Richard!
Hello Liv great job on going through the engine to find out what happened looking forward to watching your build on the car Wishing you well Take Care
I learned something. Didn’t know the cam was in the cover.
It's a shame to park a car for a bad cam and rockers. Keep up the good work young lady.
This car would be a the perfect recipient of the 4200 Atlas I-6. With a turbo, it would have plenty of power up top, it woud cruise long distance efficiently, it would run silky smooth as I-6s do, and it might even be lighter than the original engine. Richard has some videos on them.
liv, i see your a vice grip garage girl, awesome! your show and dericks are my favorite to watch, such good content on both
Love you Olivia, real stuff, and so cool.
Hi Liv looks like a fun project now that you've sold the hot rod you can focus all your time on this one looking forward to the next video love the knowledge you have and the eagerness to learn is infectious take care
Thanks for doing this vid Liv!!!!
Some fabulous cars in that garage, including the one you’re working on.
The OHC6 had oiling problems. The oil went from the (small) pump to the crank and rods first, and then to the head. As the bottom end wore, the oil delivery to the top end went down until, ultimately, there was insufficient pressure and flow to properly operate the lash adjusters and lubricate the cam.
They were sweet, but were prone to failure between 80 and 120k miles.
There is also the possibility of insufficient surface hardening of the cam and cam followers.
I can remember here in Australia that General Motors-Holden very nearly used the Pontiac OHC six in our HR series Holdens in 1967 but it never eventuated, we kept using a six that was the same design as a Chevy 2 / Nova and in 1968 we used Chevrolet 307 and 327 small blocks in our Holdens as well with Holden designed V8’s as well as 350 Chevs in later models, we used a variety of GM designed engines and also used the Buick 3800 V6 in front engine rear wheel drive from 1988 in atmo and supercharged forms for many years in our Holden commodores and many variants of the LS small blocks into the late teens
Pontiac Tempest - 2nd Generation 1964 - 1967: Base OHC Inline 6 (1Barrel Carb) 165 HP. Sprint Inline 6 (4Barrel Carb High Compression 207 HP) was a pretty respectful stock HP for it's time. One year later, the Ford Custom bone stock 302 V8 was 210 HP ... That's only 3 HP difference between a 6cyl & V8. There, was also a Tempest and GTO factory wagon.
I think and agree, the inline 6 engine(s) should be tucked away in a safe place - replaced by a modern power plant where parts are easily available. If for only as a weekend show car, trailer it, but keep the factory Inline 6 in it for it's originality. (IMHO)
One ride in a 400 GTO with a Turbo 400 trans and you quickly realize safe storage for any OHC 6 ( even the Sprint ) and that crazy switch pitch Turbin 300 two speed trans is the closest DUMPSTER ! and you are correct, the first year for the OHC 6 was 1964.
Also check out, "Mysterious Radical Race Engine! MUST SEE!!!" by Ellison's Machine Shop - Your Engine Guy... 👀 It's in 3 parts.
Cool Build! ✌
Oh yes and ona financial note O’Reilly‘s auto parts commercial that you did ,,, it pops up on Matt’s recovery and off road towing channel it hits on almost every commercial spot on that channel nice thanks I’m talking about the one at Travis shop/ rental house !!! ,,,thanks BigAl California. Just look up Matt’s off road recovery and towing and you will see your self on the O’Reilly‘s auto parts commercial nice BigAl
Pontiac always done major experiments....They had everything first... Electronic ignition etc.. Those are like the Ford cam followers on a 4.6 5.0 5.4 on that Pontiac... Awesome 😎 Thanks for sharing...
Hi Liv, this is very interesting to me. I have always wondered how it looked under that functionally animated designed cam cover. Thank you
bro I luv how u let her work on her on car so she can learn...boss move
Great video! Thanks for sharing. I came of age in the late 70s and early 80s and never even knew this engine existed. It's pretty cool, when you think about it, but we all wanted V8s, and a 6 cyl would have been completely out of the question.
Ah....for the love ❤️ of de Pontiac 👌
Pretty cool engine. I haven't seen the inside of one of those since the early '70s when my cousin came back from Viet Nam and had to tear into the top-end like you just did. Pretty exotic design for then.
Your Pontiac knowledge is impressive! Take notes, kids! The Liv is talking!
😎👍
Oh yeah. Tell Danny it's gallery not galley. A galley is the kitchen in a ship. Trust me. It took me a while of losing arguments before I finally caved into calling it a gallery. 🤣
Holy smokes I had feeling when he said he was bolting on that bracket. Good thing it snapped when it did luckily no one was injured. One of those career ending mistakes. After hours in the shop and hard to explain gezz ..it's going to be legend Best Wishes 👍
THE BEAUTY OF THE BELT DRIVE, IS IT WAS DESIGNED FOR THE FARMER TO FIX. CHAIN VS BELT, NOT ENOUGH HOURS IN THE DAY...😒😒😒 LOVE THIS EP.......
Built a sprint engine! Such a cool engine for its time.
Yep I owned one in a 67 lemans OHC Sprint, . Q-Jet and had the factory cast exhaust header. Cracked lifter bore in the head killed it. It was a total blast to drive.
Yeah might have to weld up that bracket if not source able. Rockin the VGG Independence!
The parts for the OHC 6 are hard to come by. That bracket looks aluminum. Find an aluminum specialist in the repair.
Im not sure if Pontiac were ahead of its time there. Jaguar had been producing the xk 6 for almost 17 years by the time this engine was introduced. The xk was a phenomenal engine. Still is. Twin cam hemi inline six with a 4.125 stroke and rods that are 7.75” long. Still, Thanks for showing us this unicorn engine. Also thanks for the research on it. Many of them scrapped without a second thought.
This car would be best served by returning it to its original motive power and running gear.
I agree.Everybody and their grandmother has a V8.
@@deliveryguyrx It's too bad she can't appreciate the history. It's like bolting a gas turbine engine to a P-47 Thunderbolt because it's better than the original Pratt & Whitney R-2800 Double Wasp. True, it is. But it misses the point doesn't it?
Close, in 1966 the monojet single barrel 6 cyl. was 165hp and the Sprint was 207.
Also, the belt is adjusted by loosening the bolts holding the distributor/oil pump housing and sliding it up or down.
That engine is a really rare pc.I hope you saved it,Pontiac guys would scoop it up.
SOLD ME, get rid of six, my Dad had one in our Garage for years came out of our 1966 Tempest. I thought it was one of the most beautiful looking cars back in 1972 when i was 8 years old. We took it all apart and scrapped it in 1974. Back then it was just a junk car. Lots of people didnt take care of cars back then. Heck in looked like yours and it was only 9 years old at the time, Paint fade and bondo. Dad tried his hand at do it yourself bondo from Grand Auto, never painting it. Someone hit it in a parking lot and drove off taking out the quarter panel he spent weeks fixing. That and that engine was the death of our old Tempest.
I knew that bracket was going to break
that cam cover would make a cool piece of garage art
nice top end pics 👀👀👌👌
Looks like rookie engine swapping day
I say find and rebuild a big block Pontiac V8 (389,455). Put it in the Tempest. But save that OHC6. It can be rebuilt and can be used to power a generator in case of a power outage.
Jay Leno has a very similar car with Overhead Cam Six and it's a sweet car keeping the 6 and upgrading the brakes and suspension, incl. the steering box. John Delorean's idea to compete with the European cars he admired so much. He did also replace the cam rockers with hardened aftermarket's which were a problem on the original which also allowed him to raise the oil pressure as well and improve engine life. You should check out his video, these cars a kinda rare. Horsepower isn't really an issue as the handling and lighter weight make this a very fun car to drive.
I love your Pontiac and time to put that cool 455ci Big Block with dual carbs feeding that screw blower, so awesome 👍😎 ps/ be careful with those guys, they're reckless and ignorant with machinery. I've never seen such recklessness and unprofessionalism in my 30 years of doing engine work professionally. Thanks Liv!
Best lookin mechanic ive seen, she is
I ran into a problem like that years ago on a 4 cylinder Pontiac Sunbird that somebody did a head gasket and put to much silicone on the valve cover and the silicone covered the oil holes and restricted oil flow to the cam, I noticed all the orange silicone on the head so make sure the oil holes that go to the valve cover are clear, also an old engine just might have low oil pressure.
Yes please rake it . Ol drag racer trick shift weight to rear wheel's. And looks great 👍🤳
That six is a gem of innovative, cost effective engineering that just missed the mark. In a pristine environment their cam oiling solution probably worked great. In the real world of missed oil changes and sludge buildup it became a point of failure. Too bad.
i am a professional transmission rebuilder and shop owner, retired 2 years. your transmission is a Super Turbine 300, 2sp. most had a maple leaf embossed on the top of the bellhousing. they were made in Canada, and they were air cooled, that is the reason for the holes in the bell housing,,,,,,,,,,,,,,,,,,
I remember seeing very few of these engines as a kid, the few I saw were in tempests
you have a gem girl the best car ever love it from bedford va
The Independence shirt was almost a neat as seeing the inside of that cam cover.
Really good how-to video. Peace!
I love this car!
I'd take it, my Beaumont has a clapped out 250, and would love the upgrade, also I wish up here in Canada we could ditch the inner fender wells but they are a must to be inspected.
What year Beaumont do you have mate?
@@CJColvin 69
@@billwall3913 Awesome brother.
My first car was a '69 Firebird I bought 1 year old for $1750. It had the basic 6 cyl engine and a 2 speed automatic, it wasn't fast but it was a nice driving car, top end was 105 mph.
Poor straight sixes. They never get any respect. Everyone always goes with a V-8. I think it would be way more interesting to build a high performance straight six and see how fast you could get it to go in the quarter mile. In the late sixties early seventies a friend of mine held the NHRA national record for low e.t. in his class runing a straight six in a '65 Chevy Bel Air. All his friends would brag about fast their cars were and then he would take them to his garage and show them the plaque on his wall for his NHRA national record and that would shut everyone up real quick! Cool video.
A 4200 straight 6 out of a Trail Blazer would be cool
How did the oil get to the cam. Wonder if all that silicone plugged some oil holes
Are you going to Tucson for Duct Tape drags this year?
That noise are the cam lobe riders that connect to the hydraulic lifters. You’ll need a cam, cam riders, hydraulic lifters. Good luck finding them. Jay Leno has blog restoration update done in the last 6 months on his channel. He goes over what he had to do on his 4V OHC engine. Basically the same problems as yours.
Good morning from Indiana!
To awesome girl I'll definitely be following along, and weighting to see that OHC 6 on the turbo booster, right after he does his thing with the Northstar. Just kidding of course, lol.
OH!! memories 223378U607387 '68 F'bird Sprint OHC 4bbl,, put over 150K,,LOVED that car! Ordered new whilst stationed at DOW AFB, Bangor Me. 6 cross country trips. The distributor drive/oil pump carrier was the adjustment for the belt, it slid on a "ramp" up and down. The 230 had shorter cam finger lifters than the '68 250. I believe Clifford Research 6=8 still has parts avail.
My uncle had that very car.
I remember It said Sprint, on the fender. 4-speed.
Very advanced, for the time.
I was hoping you would do a tear down of that top end.Pretty interesting how that worked.Or didn't work apparently.Still pretty cool though.
Hell yes Mr.Holder Can't wait to see on Dyno, turbo charged?
hope he installs a Clifford 4 bbl step up on it first.
OOOOOPS , That broken bracket might be a little hard to replace ;(
callmenort nortin And they dodged a bullet when that bracket came Real close to breaking the windshield. You can hear it bounce off when it hits right where the rear view mirror is.
was thinking the same thing...... what a foolish mistake.....a very potentially dangerous mistake
@@neal6418 Sometimes it's better to be lucky than good . And I think this was one of those times. The way that they don't even say anything about makes you wonder if they even know how close it was.
I was waiting for the cam gear that she was beating the crap out of to break, these parts are going to be tough to replace!!
@@robertcates4066 That's why she's giving the engine to someone else and she's putting in an ls. Yawn.
What I know for sure Is" She Is Sweet! and she works on cars! RARE" Whoever the boyfriend Is Marry Her Now" You won't find one as Sweet as she Is Ever again! Beautiful!
that is a great engine. Given the sludge that is present in the engine, it is likely that the oil passage to the cam was partially block starving the cam and rockers of oil. An interesting point is that the engine had hydraulic lifters/lash adjusters.
Should pulled the front clip then it would a few things done at one time , all aluminum block is what it needs just wait til you get one to go in it nice O’Reilly‘s auto parts commercial thanks BigAl
Interesting video but you should know that sixes were very common back in the sixties. Muscle cars of any type were fairly rare, maybe one out of every ten or fifteen vehicles, but they are the ones people remember. The best selling muscle car at the time was the GTO and they sold 130,000-ish in their best year. The best selling car was the Impala with 1.4 million sold in '64 so there were more than 10 time as many Impalas as "Goats". Lots of cars back then had OHV sixes and three-on-the-tree manual transmissions bur OHC sixes were very rare in detroit iron. The OHC sixes were considered to be higher performance option compared to the workhorse OHV sixes but did not give as much power as a high-compression small block V8 with a 4bbl. The Sprint powered cars were quicker than the same cars powered by a V8 with a 2bbl.
First time I saw one of these was in 67 in front of our barracks in the army
This was one of first uses of timing belts
Said would run for 500 tho without trouble
Looks like that one may have almost made it
Do Not throw away that powerglide transmission. the OHC 6 makes a good boat anchor.
Pleases save the OHC6-everybody scrapped them for a V-8-they are cool-as is your channel!
Now this is just me but instead of sticking the ls in it I'd go through that straight six and overhaul it put a bigger cam and a larger Turbo with a 4l80 transmission and drive that road warrior. ..
The old motors of yesterday need Zinc in the oil . The government had zinc removed if you dont use a zinc supplement you will blow your camshaft.
Good time to look for a Sprint 6 engine to replace this one. There is a seller in Ga. on ebay that got a 1 bbl of this "Rehol-261".
Impossible
Clearly you didn't listen to the video. She's swapping it to a v8. Due to parts availability and budget. Plus She's got quite the surplus of LS engines if that's what she chooses. While dissapointing it's completely understandable as to why she's swapping the engine.
@@KatarinasGarage Apparently you don't understand finding a Sprint OHC 6 is impossible.
@@Hanzyscure She can always grab some Hemming Motor News and talk with Sprint 6 fourms as well to look. Every once in a while a rebuilt one does come up.
Needs the quadrajet upgrade used on some of the OHV 6s
And 3 or 4 speed tranny...
@@BuzzLOLOL I didn't know a tranny had 3 or 4 speeds ..the ones
I know only have reverse. ....oops
Different story .. lmao
Cool yanked that SOHC out. Stay focused. Yeah get things moving forward. 👍🏻😎
5:40 good thing you moved!
Had one of those when I was i kid Grampa had a 65 GTO tri-power I am now work at Ford in Dearborn R&E center
I had one of those overhead cam sixes I rebuilt it high-compression Pistons Portishead Turbo make 418 horsepower
Damn why is all good fun ladies taking
I had a 67 chevelle 300 post car like that. They are lighter than the Malibu. That rear window is hard to get!
New cam and rockers and it's good as new 😀
It's got a hard rod knock.
@@Hanzyscure I was just joking , but people always feel they need to put their 2 cents in 🙄
Richard Holdener ? cool 👍
They were famous for timing belt breakage
What Mopar is under that cover?
Is that a matching number car???
One thing I learned a long time ago, if you don't break the cam in correctly ,it will be rounded off after 15 minutes or less.
LS and a 5 speed swap!
I would drop a nice LS in make it a sleeper.😎
Every cam is a turbo cam except that one this one went from a stock round lobe cam to a flat lobe cam
I am so excided for you and seeing you start your project. If you need any help I'm a Certified Mechanic and I will work for Free because I got you and your team back 100%.
Air Cooled Poweglide..or is it a switch pitch tranny?
Put C10 2wd truck springs in it....I did this in a GTO of mine car had a nice stance....