I believe everything I read on the net. Never the less they dont give out anything on the cam anyway.bob460 wrote: ↑Mon May 02, 2022 11:41 pm This one peak's at 6400rpm on pump gas and 10.75 comp!!
https://www.shafiroff.com/chevy-pump-ga ... d-sr20.php
Question for cam gurus
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Re: Question for cam gurus
Re: Question for cam gurus
They're not real aggressive, but how mild can a .500" lobe be ?AA Performance wrote: ↑Tue May 03, 2022 3:53 am CamKing, how aggresive are your lobes and how much spring would they need with steel valves?
You would need 275-300# on the seat, and 780-830 @ Max lift.
Mike Jones
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Re: Question for cam gurus
How many miles will lifters last with them spring pressure's?CamKing wrote: ↑Tue May 03, 2022 9:46 amThey're not real aggressive, but how mild can a .500" lobe be ?AA Performance wrote: ↑Tue May 03, 2022 3:53 am CamKing, how aggresive are your lobes and how much spring would they need with steel valves?
You would need 275-300# on the seat, and 780-830 @ Max lift.
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Re: Question for cam gurus
I would think you would get between 2000-2500 miles with needles at best, maby if your lucky
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Re: Question for cam gurus
Forget the needles use the bushed lifter.
BAM has two recent designs for the roller axle and bushing for the roller wheel lifters.
I talked to them the other day regarding some BBC lifters and they seemed like the answer to needles self destructing.
BAM has two recent designs for the roller axle and bushing for the roller wheel lifters.
I talked to them the other day regarding some BBC lifters and they seemed like the answer to needles self destructing.
Real Race Cars Don't Have Doors
Re: Question for cam gurus
A heads up on the BAM push rod oil lifters. You may need to modify them to get oil to the rockers. It depends on how tight they are in the lifter bore. Don't go deep with the cut, maybe .005-.010" deep cut. I cut mine about .020-.025" and it pushes almost too much oil to the rockers, so keep it shallow.
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Re: Question for cam gurus
With good lifters, 20,000+
Being a 632ci engine, it's not going to see much time above 6,500rpm.
Mike Jones
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Re: Question for cam gurus
Is that the reason for the wide LSA as well, to start the exhaust earlier with the undersized exhaust valve area?
Re: Question for cam gurus
WOW.....would never of thought that many miles out of them.
What size lifter? .904 or .937
Will your needle bearing lifters do the 20,000 miles or do you recommend using your bushed or DLC lifters.
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Re: Question for cam gurus
Any roller cam used in our stuff we always suggest the customer go with a bushed roller wheel lifter.
Solid or hydraulic roller lifters will last much longer and prevent engine damage from needles from going through the engine if they fail. On any BBC marine engine they all get bushed roller wheel lifters.
The BAM lifters have a couple options for bushings.
They use a bushed roller wheel and they also use a DLC coated axle which offers a larger surface area for the wheels to rum on. Pressure oiled as well.
Personally I have not used the DLC coated axle style but many sets of bushed roller wheel type.
And no issues with any so far. The oldest set is hyd. rollers about 10 years ago now and they are still going.
Solid or hydraulic roller lifters will last much longer and prevent engine damage from needles from going through the engine if they fail. On any BBC marine engine they all get bushed roller wheel lifters.
The BAM lifters have a couple options for bushings.
They use a bushed roller wheel and they also use a DLC coated axle which offers a larger surface area for the wheels to rum on. Pressure oiled as well.
Personally I have not used the DLC coated axle style but many sets of bushed roller wheel type.
And no issues with any so far. The oldest set is hyd. rollers about 10 years ago now and they are still going.
Real Race Cars Don't Have Doors
Re: Question for cam gurus
I thought bushings only come out in the last 3-4 years for hydraulic roller lifters, and only by isky lifters. So don't know how you have a set going on 10 years , unless your running hydraulic roller cam with solid lifters.ProPower engines wrote: ↑Thu May 05, 2022 1:23 am Any roller cam used in our stuff we always suggest the customer go with a bushed roller wheel lifter.
Solid or hydraulic roller lifters will last much longer and prevent engine damage from needles from going through the engine if they fail. On any BBC marine engine they all get bushed roller wheel lifters.
The BAM lifters have a couple options for bushings.
They use a bushed roller wheel and they also use a DLC coated axle which offers a larger surface area for the wheels to rum on. Pressure oiled as well.
Personally I have not used the DLC coated axle style but many sets of bushed roller wheel type.
And no issues with any so far. The oldest set is hyd. rollers about 10 years ago now and they are still going.
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Re: Question for cam gurus
20,000 miles???? You serious??? What are you running over the nose, 350 - 400 lbs.
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Re: Question for cam gurus
Pro Power Engines , I dont think time frame realy cuts it for how long the lifters last, my Isky EZE Max have been in my BBC for 8 years and I run a solid roller with no wear at all.
Re: Question for cam gurus
Try 800lbs at max lift.AA Performance wrote: ↑Thu May 05, 2022 5:55 am20,000 miles???? You serious??? What are you running over the nose, 350 - 400 lbs.
Great thing about these big inch Big Blocks, they need a lot of duration, and don't turn a lot of RPM.
The springs will wear out, before the lifters need rebuilding.
Mike Jones
Jones Cam Designs
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jonescams@bellsouth.net
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Jones Cam Designs
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Re: Question for cam gurus
Can't believe that Mike, not 20,000. Whos magical lifters will give that milage coz I will be using them from now on. Anyway the low RPM doesn't give much oil flow and pressure which will hinder the performance of the lifter. I would think they would be happier at 6000 rpm compared to idle at 1000 rpm.CamKing wrote: ↑Thu May 05, 2022 10:50 amTry 800lbs at max lift.AA Performance wrote: ↑Thu May 05, 2022 5:55 am20,000 miles???? You serious??? What are you running over the nose, 350 - 400 lbs.
Great thing about these big inch Big Blocks, they need a lot of duration, and don't turn a lot of RPM.
The springs will wear out, before the lifters need rebuilding.