Great video. Remember the days when we thought we knew so much when someone explained the advantages of a forged piston. Now we learn how many materials cams are made from. Thank you.
@@Compcams1976 i bought the big mutha thumpr roller cam for 351w sbf and was told by a comp tech that big mutha thumpr roller 35-602-8 is a 5150 Billet steel! Then i seen on speedway site that the big mutha thumpr roller cam for 351w sbf is a austempered ductile iron camshaft and what distributor gear material is appropriate???
Info may be outdated. Called Com Cams recently asking about 35-522-8 cam and the guy said they are no longer austempered steel but billet. Making it even more difficult to know which distributor gear to run. They recommend melonized but if it is billet steel would think steel gear is also fine. sigh.
What kind of distributor gear and fuel pump push rod does these austempered cast roller cams use? Mine is a SBC xr294hr retrofit hydraulic roller cam for SBC.
I just did the same swap on my BBC I called Comp Cam tech line they said melonized distributor gear which My MSD street fire dist came with they said it's compatible with the factory fuel pump push rod as long as I'm not using a really high pressure pump, so far so good it's a awesome upgrade and noticable my power, I would call there tech line just to be safe
@@johnweaver8470 Comp has told me a melonized gear and another told me a bronze gear. One told me a stock fuel pump pushrod and another said bronze tipped. All these answers came from comps service department.
@@inscoredbz that's frustrating indeed two people giving different advice, I've only got a couple hundred miles on mine so far but I'm daily driving it I'll try and give a update after a thousand miles
Well That Explains Why I Couldn't Get My 108 LSA Camshaft. You Talked About Changing The Base Circle Of The Camshaft. Does That Mean All Camshafts Have Different Base Circles If The Lifts Are Different? My Current Cam Was A .34" Lobe Lift. New Cam Is A .32" Lobe Lift. Does That Mean My New Cam Has A Larger Base Circle And That I Need Shorter Pushrods? (this is a hydrolic roller cam engine with fixed rockers, preload is adjusted with pushrod length)
I believe that at least some of the information in this video no longer applies. For example his statement about having many cam cores available. This covid thing has effected the availability of cam cores and it usually delays the delivery of custom ordered cams due to the wait time for the core being as much as 4 months. I recently purchased two custom order cams from another manufacture, and two different manufactures told me over the phone that cam core availability is greatly reduced right now from what it once was, and therefore the wait times are extensive for custom orders. And I suspect that tool steel cores might even be more of a problem to find. But that's just a guess
Do you sell cam cores to Herbert cams. I purchased a 4x7 swap retro roller with the pressed on and pinned cast gear for my 1990 454. It looks identical as the 8620 with the copper coloring etc. Just curious
Hi, I have a comp cam 35-283-3 in my 351w. I have a iron gear which was supplied on me fast ez-run distributor and seeing ware on the distributor gear after only a few miles. Do you recommend upgrading to a composite gear? Thanks
got a question i got chevy 355 in 1990 k5 blazer just rebuild the engine and i did a few up grades on it i up graded the cam i put a howard ratter cam in there lift 525/530 duration .50 227/235 centerline 103 everything is pretty mush stock it was a tbi with the computer i converted it to carb. i put edelbrock carb ...when i frist started it up i could hear the cam pretty good but after i drove it a few times i didnt go far i been letting it idle playing with the carb trying to set it,,i notice i dont hear the rattle sound enymore its like it got quiet and went away..
Hey Ken. Thanks for the question. Lift isnt a big factor in guessing what an engines vacuum will be. Overlap is important, along with duration. Like anything, knowing the entire package is also important. What intake (very important!)? What compression ratio? Our tech line can also answer any questions you may have.
Great video. Remember the days when we thought we knew so much when someone explained the advantages of a forged piston. Now we learn how many materials cams are made from. Thank you.
Lots more videos like this one coming soon! Thanks for watching!
@@Compcams1976 i bought the big mutha thumpr roller cam for 351w sbf and was told by a comp tech that big mutha thumpr roller 35-602-8 is a 5150 Billet steel! Then i seen on speedway site that the big mutha thumpr roller cam for 351w sbf is a austempered ductile iron camshaft and what distributor gear material is appropriate???
Good video -lots of information.
Excellent in dept explanation really neat video. A cam is not just a cam.
Thanks! We seem to think so.
Info may be outdated. Called Com Cams recently asking about 35-522-8 cam and the guy said they are no longer austempered steel but billet. Making it even more difficult to know which distributor gear to run. They recommend melonized but if it is billet steel would think steel gear is also fine. sigh.
What kind of distributor gear and fuel pump push rod does these austempered cast roller cams use? Mine is a SBC xr294hr retrofit hydraulic roller cam for SBC.
I just did the same swap on my BBC I called Comp Cam tech line they said melonized distributor gear which My MSD street fire dist came with they said it's compatible with the factory fuel pump push rod as long as I'm not using a really high pressure pump, so far so good it's a awesome upgrade and noticable my power, I would call there tech line just to be safe
@@johnweaver8470 Comp has told me a melonized gear and another told me a bronze gear. One told me a stock fuel pump pushrod and another said bronze tipped. All these answers came from comps service department.
@@inscoredbz that's frustrating indeed two people giving different advice, I've only got a couple hundred miles on mine so far but I'm daily driving it I'll try and give a update after a thousand miles
@@johnweaver8470 I'm going to run a melonized gear and I have a bronze tipped aluminum fuel pump pushrod. I'll just have to check it periodically.
Well That Explains Why I Couldn't Get My 108 LSA Camshaft. You Talked About Changing The Base Circle Of The Camshaft. Does That Mean All Camshafts Have Different Base Circles If The Lifts Are Different? My Current Cam Was A .34" Lobe Lift. New Cam Is A .32" Lobe Lift. Does That Mean My New Cam Has A Larger Base Circle And That I Need Shorter Pushrods? (this is a hydrolic roller cam engine with fixed rockers, preload is adjusted with pushrod length)
Good video, nice quality
Thanks and thanks for watching! More of these coming very soon!
Great information. Thank you.
Thank you James!
I believe that at least some of the information in this video no longer applies. For example his statement about having many cam cores available. This covid thing has effected the availability of cam cores and it usually delays the delivery of custom ordered cams due to the wait time for the core being as much as 4 months. I recently purchased two custom order cams from another manufacture, and two different manufactures told me over the phone that cam core availability is greatly reduced right now from what it once was, and therefore the wait times are extensive for custom orders. And I suspect that tool steel cores might even be more of a problem to find. But that's just a guess
Do you sell cam cores to Herbert cams. I purchased a 4x7 swap retro roller with the pressed on and pinned cast gear for my 1990 454. It looks identical as the 8620 with the copper coloring etc. Just curious
Hi, I have a comp cam 35-283-3 in my 351w. I have a iron gear which was supplied on me fast ez-run distributor and seeing ware on the distributor gear after only a few miles. Do you recommend upgrading to a composite gear? Thanks
My installer ordered my cam two weeks ago today still haven't came in yet, is it like a slow process? He ordered with Flyin ryan performance
So a 32-651-8 is ok to run with a factory distributor gear then ?
What makes you think that you can buy an aftermarket cam and run a factory gear?🤡
got a question i got chevy 355 in 1990 k5 blazer just rebuild the engine and i did a few up grades on it i up graded the cam i put a howard ratter cam in there lift 525/530 duration .50 227/235 centerline 103 everything is pretty mush stock it was a tbi with the computer i converted it to carb. i put edelbrock carb ...when i frist started it up i could hear the cam pretty good but after i drove it a few times i didnt go far i been letting it idle playing with the carb trying to set it,,i notice i dont hear the rattle sound enymore its like it got quiet and went away..
A ratter cam? Isn’t that for a big block 🥩
I bought a Comp camshaft with .566 lift exhaust and intake lift, can you tell me what kind of vacuum I would have?
Hey Ken. Thanks for the question. Lift isnt a big factor in guessing what an engines vacuum will be. Overlap is important, along with duration. Like anything, knowing the entire package is also important. What intake (very important!)? What compression ratio? Our tech line can also answer any questions you may have.
Hoover or Dyson?
What is the copper color on the 8620 cam?
It’s a ford copper cam, kinda like a mopar purple cam👍
@@alanmeyers3957 my 454 4x7 swap roller cam is copper colored as well, may not be just a Ford thing idk