Damn that’s the strongest running 305 I have seen. I played around with a 305 In a 1978 Chevy Monza Spyder in the mid 80s It came stock with a 305 with 140 hp at the flywheel. I put aluminum Edelbrock dual plane intake and a 600 cfm carb. Plus a edelbrock performer plus cam, I ran true dual exhaust and stock exhaust manifolds. Put a B & M shift kit in the Trans. Ran my buddies bone stock new 1985 Buick GN which was rated 200 flywheel hp. Beat him by 5 car lengths and was still pulling away. We raced probably 20 times from a roll on and a dig. He said you finally put a Chevy 350 in that Monza. I said it’s still the 305. He said damn that engine runs great. Believe it or not I beat many new muscle cars in the mid to late 80s with that little 305 Monza Spyder. Bought the wife a 1984 Pontiac Trans Am in 86. It came with the 190 hp 305 HO automatic. It ran a best of 15.40s at 87 mph at the track. . Only raced it at the track once. I impressed with the performance you have got out of your 305. I would lose the single plane and go back to the dual plane.,
One day maybe you can bump it up to 10 - 10:5.1 compression. A set of worked over Vortec heads to go with that big cam would pickup a bunch of power! And a 3200-3500 stall is only going to help you. And leave that "Boss Frog" on the pavement, get a decent Freak Show converter. What trans do you have? If you haven't already, upgrade it and put a manual shift setup in it, make it as hard hitting as you can, that will knock off more time. Depending on how far you want to go, every pound of weight you knock off of it is free horsepower! It's getting faster, love it! Reminds me of building my first car back in the 80's. Keep going, you're kicking butt! 💪👍
You can spray on a dp intake. We did a 150 shot on our 306 sbf and Went a best of 6.57 at 105 mph in a full weight 1985 LX. I do enjoy watching the 305 upgrades.
Cool build! Seen all your videos. If you use a dual plane with a spacer between the intake and nitrous plate, that will work fine. I have also milled down the center divider on a dual plane and run a nitrous plate right on top of the intake. A 150 hp shot of nitrous will not hurt that 305. Just make sure you add the supplement fuel for a nitrous solenoid from a electric fuel pump with a regulator to keep the fuel pressures constant. In addition the nitrous jetting chart from nitrous outlet are actually pretty close to optimal tunes. I think 150 hp shot will get you close to mid 12s. Probably need a loose converter to get into the 13s na.
That single plane intake is killing you. Definitely go back to a good dual plane. There are no problems with running a nitrous kit with a dual plane intake, I have done it many times before.
Install your 1.6 rocker arms on the exhaust valves, advance your cam 4 degrees, timing all in should be near 36 degrees. Install your dual plane intake
@@jesusavila7955 On our Dyno We have seen on 305 with vortex heads that a 1.6 rocker arm helps the exhaust to escape better clearing the cylinder to breath better air and fuel in the cylinder. You must get exhaust out better to allow the induction to breath better. This set up on 305 actually added 23 HP compare to just 1.5 rocker arms
👍 Been looking forward to this one for while. :-) Interesting results, it does sound like a higher stall will improve the 60ft by a bit, you can hear the engine stay at a constant rpm for a sec after launch before increasing in rpm. I'm no stall expert so a higher stall could hurt the performance and street ability a bit but it's worth a shot to break into 13s, your so close. Thanks for the videos and I look forward to the next one!
I had similar results with a 305, swapping intakes with little change at the drag strip. I think that lower gears will let your new setup show it's potential. Thanks for the comparison video!
Yup, you nailed it at the end... dual plane + converter. IMO - it would run a lot better with an RPM or RPM air gap style intake and a 3500+ converter. My friend Matt Walter had a 305 20-ish years ago that was very quick. I want to say low 13s or high 12s. His car was light, but the combination was simple. @MattWalter1 Maybe he'll see the tag and chime in.
Good video man. I’ve done the same with a single plane before on a mild 350. Certainly didn’t do as good as a dual plane, but had good power, and was fun. I had a bigger stall though. Also be careful when putting on the balancer without a proper tool. I’ve personally pulled some threads out of the crank before….not fun.
They say you learn from your mistakes and I've made a boat load in my time. First i want to say good job with the testing and taking the guess work out of what works and what don't. If you don't mind a few pointers from the mistakes I've made back in the day i believe you could save some time and money hopefully. First off i know and understand your wanting to make the 305 better and you're do great but it is what it is. Now everything performance you get like camshaft and intakes is based on the 350 especially camshafts so if a cam card says it's 480 lift and a mild idol it won't be in a 305. But by now I'm sure you've figured that out. My opinion is and you can take it for what it is " my OPINION " you have just about everything you need to go into the mid to upper 13s. The only thing I see you should've gotten was a 10" converter with 2200 to 2600 stall. That with the dual plane intake 1.6 rockers pretty sure that's the setup that would work best. Like I said it's just my opinion. Good luck with everything you do and have fun while you're young. JS
Rockers, bigger converter, more weight reduction, dual plane, vortech heads + compression, shift kit, and suspension might pull an 11.5-12.0 range! 5 speed conversion will also get you good amount of time + it’ll solve your stall issue. Be an upgrade overall.
You're right there where I was with my '64 Buick Skylark with a Vortec sbc 305 topped with a RPM Airgap and 1.6:1 roller rockers. It had a 700R4 with a 3.73 rear gear. It still had the factory roller cam, was a very fun car to drive and got very good mileage. More cam with more lift would of helped a lot. But I stopped driving it when the gas tank fell off at the track.😂 The fuel hose dragged it, I ended up putting the tank in the trunk and routing the fuel line to drive it home. If you get a chance to score a set of 305 Vortec heads, do it, they'll probably drop another .2 to .5 off those times? Use a set of 1.6 rockers with them. Make sure you do what is necessary to run higher lifts with Vortec heads. Unless you get the new ones GM is having EQ make, those are already machined to handle the extra lift and they are machined for screw in studs. Or run what ya got?😎👍
If you haven’t subscribed yet might want to, already have a 99 305 vortec on engine stand soon to be replacing the one in car at a certain point this summer. Also have another roller block with aluminum 113 heads. Plan to go small to big and maximize each combo until very end should have a low 10sec 305 on spray time I’m done. Thanks for watching!
Ya. Lost alot on the low end with the single plane and the cam. Your previous combo worked really well with the milder cam and the 107LSA. The 110LSA on the 280H and the 230deg duration probably isn't doing you any favors. Those heads would benefit from a higher lift cam with the porting you did tho. Ive heard they flow close to the stock 305 vortec heads when ported and they flow very good up to .500-.525 lift and fall off after that. Those 081 heads are going to be close to what stock vortecs flow. Looks like your on your way to dialing it in. Looking forward to the next vid. Cheers👍
305s got a bad rap because of the stupid low compression. I've seen higher compression 305 builds that would spin to the moon and made pretty.good power
Would definitely go back to the dual plane and go up to a minimum of 2600 converter. Dont remember what gears you have, but a 4.56 may be a good jump if you go to any larger of a cam
150 shot of NOS WILL blow a 305 with stock mechanicals and an 80's edelbrock performer sooner than later, if this is in the back of your mind...good luck. If it isn't beware. It's capable of about a couple dozen runs with a 150 shot of nos before it starts spitting parts, I wanna say just over 2 10 lb bottles worth.
I plan to swap in a more nitrous capable 305 before I blow it up. Also gonna use a nitrious progresser to ramp in the spray instead of whacking it over the the head. If it doesn’t work in the end it’s just a 305.
@@Krikkebobbyracingchannel Good luck man, I appreciate that you're not just slapping an LS in it like everyone under the sun. It takes balls to be different- especially nowadays.
Almost in the 13’s…0-60 time well under 5.7 sec. Looking good with a 305 backyard build. 👍
Damn that’s the strongest running 305 I have seen. I played around with a 305 In a 1978 Chevy Monza Spyder in the mid 80s It came stock with a 305 with 140 hp at the flywheel. I put aluminum Edelbrock dual plane intake and a 600 cfm carb. Plus a edelbrock performer plus cam, I ran true dual exhaust and stock exhaust manifolds.
Put a B & M shift kit in the
Trans.
Ran my buddies bone stock new 1985 Buick GN which was rated 200 flywheel hp. Beat him by 5 car lengths and was still pulling away. We raced probably 20 times from a roll on and a dig. He said you finally put a Chevy 350 in that Monza. I said it’s still the 305. He said damn that engine runs great. Believe it or not I beat many new muscle cars in the mid to late 80s with that little 305 Monza Spyder.
Bought the wife a 1984 Pontiac Trans Am in 86. It came with the 190 hp 305 HO automatic. It ran a best of 15.40s at 87 mph at the track. . Only raced it at the track once.
I impressed with the performance you have got out of your 305. I would lose the single plane and go back to the dual plane.,
Love the before and after side by side comparisons! Thumbs up 👍
I'm a Ford guy, but I've been following this car. I like your approach.
And this is why we Test.
One day maybe you can bump it up to 10 - 10:5.1 compression. A set of worked over Vortec heads to go with that big cam would pickup a bunch of power!
And a 3200-3500 stall is only going to help you. And leave that "Boss Frog" on the pavement, get a decent Freak Show converter.
What trans do you have? If you haven't already, upgrade it and put a manual shift setup in it, make it as hard hitting as you can, that will knock off more time.
Depending on how far you want to go, every pound of weight you knock off of it is free horsepower!
It's getting faster, love it! Reminds me of building my first car back in the 80's. Keep going, you're kicking butt! 💪👍
You can spray on a dp intake. We did a 150 shot on our 306 sbf and Went a best of 6.57 at 105 mph in a full weight 1985 LX. I do enjoy watching the 305 upgrades.
Its really cool seeing what a 305 is capable of
Cool build! Seen all your videos. If you use a dual plane with a spacer between the intake and nitrous plate, that will work fine. I have also milled down the center divider on a dual plane and run a nitrous plate right on top of the intake. A 150 hp shot of nitrous will not hurt that 305. Just make sure you add the supplement fuel for a nitrous solenoid from a electric fuel pump with a regulator to keep the fuel pressures constant. In addition the nitrous jetting chart from nitrous outlet are actually pretty close to optimal tunes. I think 150 hp shot will get you close to mid 12s. Probably need a loose converter to get into the 13s na.
That single plane intake is killing you. Definitely go back to a good dual plane. There are no problems with running a nitrous kit with a dual plane intake, I have done it many times before.
I like it! I love the step by step changes and the Dragy results with them. Planning to do this with my 301 Pontiac swapped 82 Trans Am.
Great video as usual. Thanks for the update!
Converter should make a big difference.
Damn you could of used a way looser converter now
And another rear gear. Higher ratio.
@@machwind3266 yeah for sure I used 4.56s on my 305 but I had a 4 speed auto and 3600 stall
no. let the engine do the work. Just gear down
He has 4.10s.
Very cool.thanks for sharing.
Install your 1.6 rocker arms on the exhaust valves, advance your cam 4 degrees, timing all in should be near 36 degrees. Install your dual plane intake
No, you need more lift in intake no exhaust... The exhaust Is no sensitive for lift like intake
@@jesusavila7955
On our Dyno
We have seen on 305 with vortex heads that a 1.6 rocker arm helps the exhaust to escape better clearing the cylinder to breath better air and fuel in the cylinder. You must get exhaust out better to allow the induction to breath better.
This set up on 305 actually added 23 HP compare to just 1.5 rocker arms
Now this is a great video.
👍 Been looking forward to this one for while. :-) Interesting results, it does sound like a higher stall will improve the 60ft by a bit, you can hear the engine stay at a constant rpm for a sec after launch before increasing in rpm. I'm no stall expert so a higher stall could hurt the performance and street ability a bit but it's worth a shot to break into 13s, your so close. Thanks for the videos and I look forward to the next one!
I had similar results with a 305, swapping intakes with little change at the drag strip. I think that lower gears will let your new setup show it's potential. Thanks for the comparison video!
Yup, you nailed it at the end... dual plane + converter. IMO - it would run a lot better with an RPM or RPM air gap style intake and a 3500+ converter. My friend Matt Walter had a 305 20-ish years ago that was very quick. I want to say low 13s or high 12s. His car was light, but the combination was simple. @MattWalter1 Maybe he'll see the tag and chime in.
I had that exact same cam with a little 600 Holley in a Chevelle. It was mean. Get RPM air gap intake and dial in your timing. 3000 stall
Good video man. I’ve done the same with a single plane before on a mild 350. Certainly didn’t do as good as a dual plane, but had good power, and was fun. I had a bigger stall though.
Also be careful when putting on the balancer without a proper tool. I’ve personally pulled some threads out of the crank before….not fun.
Throw some trick flow heads, dual plane and a converter.
nice video.. is time raise your compression ratio... thah all
I built a similar deal back 10 years ago but with trickflow 175 56cc chamber heads and flat top pistons .030 over
single plane intake manifold with stock 305 heads. still impressed
Good video but man I don't think I would have put that rusty water pump back on!
New water pump just oxidized rust I never painted or coated it WD40 when I originally put it on.
Maybe try the old set of rockers with this new cam
I would stick with the dual plane
They say you learn from your mistakes and I've made a boat load in my time. First i want to say good job with the testing and taking the guess work out of what works and what don't. If you don't mind a few pointers from the mistakes I've made back in the day i believe you could save some time and money hopefully. First off i know and understand your wanting to make the 305 better and you're do great but it is what it is. Now everything performance you get like camshaft and intakes is based on the 350 especially camshafts so if a cam card says it's 480 lift and a mild idol it won't be in a 305. But by now I'm sure you've figured that out. My opinion is and you can take it for what it is " my OPINION " you have just about everything you need to go into the mid to upper 13s. The only thing I see you should've gotten was a 10" converter with 2200 to 2600 stall. That with the dual plane intake 1.6 rockers pretty sure that's the setup that would work best. Like I said it's just my opinion. Good luck with everything you do and have fun while you're young. JS
Rockers, bigger converter, more weight reduction, dual plane, vortech heads + compression, shift kit, and suspension might pull an 11.5-12.0 range!
5 speed conversion will also get you good amount of time + it’ll solve your stall issue. Be an upgrade overall.
Need to find some 113 aluminum vette heads. Pretty cheap and they will bump the compression. Less weight too.
Have a set going with a roller block 11:1 compression in near future
Put a 2500-2800 converter in it with 3:73 or 3:90 gears help out a lot
Has 2400-2800 stall with 4:10 gears currently
You're right there where I was with my '64 Buick Skylark with a Vortec sbc 305 topped with a RPM Airgap and 1.6:1 roller rockers. It had a 700R4 with a 3.73 rear gear.
It still had the factory roller cam, was a very fun car to drive and got very good mileage. More cam with more lift would of helped a lot. But I stopped driving it when the gas tank fell off at the track.😂 The fuel hose dragged it, I ended up putting the tank in the trunk and routing the fuel line to drive it home.
If you get a chance to score a set of 305 Vortec heads, do it, they'll probably drop another .2 to .5 off those times? Use a set of 1.6 rockers with them. Make sure you do what is necessary to run higher lifts with Vortec heads. Unless you get the new ones GM is having EQ make, those are already machined to handle the extra lift and they are machined for screw in studs. Or run what ya got?😎👍
If you haven’t subscribed yet might want to, already have a 99 305 vortec on engine stand soon to be replacing the one in car at a certain point this summer. Also have another roller block with aluminum 113 heads. Plan to go small to big and maximize each combo until very end should have a low 10sec 305 on spray time I’m done. Thanks for watching!
@@Krikkebobbyracingchannel
I have been subscribed for a while now.😎👍
Ya. Lost alot on the low end with the single plane and the cam. Your previous combo worked really well with the milder cam and the 107LSA. The 110LSA on the 280H and the 230deg duration probably isn't doing you any favors. Those heads would benefit from a higher lift cam with the porting you did tho. Ive heard they flow close to the stock 305 vortec heads when ported and they flow very good up to .500-.525 lift and fall off after that. Those 081 heads are going to be close to what stock vortecs flow. Looks like your on your way to dialing it in. Looking forward to the next vid. Cheers👍
305s got a bad rap because of the stupid low compression. I've seen higher compression 305 builds that would spin to the moon and made pretty.good power
Try some aluminum heads along with that dual plane intake
Ah the days of changing a cam without pulling the heads lol
Your life is dope
id love too see you get your hands on some aftermarket cylinder heads and throw on a turbo and go hellcat hunting!
Thats still prity quick for a 305 Im gonna put vortec heads and a cama and 1.6 rockers shorty headers on mines try to make 305 HP
Would definitely go back to the dual plane and go up to a minimum of 2600 converter. Dont remember what gears you have, but a 4.56 may be a good jump if you go to any larger of a cam
4.10, don't need 4.56s. The converter will get him there.
Can bump you bump the ignition advance.
Needs a converter. Surprised the mph went down though. How much timing are you running?
naw, let the engine do the work
dual plane all day, gobs of hp/tq under curve... you will be happy
is this before you added the Heads?
Try locking out the timing ? I have a lot of suggestions I have done the 305 thing and maybe it needs more jet in it from the cam and intake
Timing is lock out at 36 degrees and have
A/f gauge to help guide tune up along with reading the plugs.
@@Krikkebobbyracingchannel ah it’s weird it lost mph up top what do you shift at
Ill trade you a electric water pump for those 1.6 roller rockers. Lol
She needs a torque converter with that cam
You sure about that?
whats the duration of that cam at .050? is it 230°?
Yes
Add some heads.
Trying to build this same car with my son so he’s not driving some electric pos like everyone else
150 shot of NOS WILL blow a 305 with stock mechanicals and an 80's edelbrock performer sooner than later, if this is in the back of your mind...good luck. If it isn't beware. It's capable of about a couple dozen runs with a 150 shot of nos before it starts spitting parts, I wanna say just over 2 10 lb bottles worth.
I plan to swap in a more nitrous capable 305 before I blow it up. Also gonna use a nitrious progresser to ramp in the spray instead of whacking it over the the head. If it doesn’t work in the end it’s just a 305.
@@Krikkebobbyracingchannel Good luck man, I appreciate that you're not just slapping an LS in it like everyone under the sun. It takes balls to be different- especially nowadays.
Enough with that crap music man