Question for cam gurus

[AA Performance]

This one peak's at 6400rpm on pump gas and 10.75 comp!!

https://www.shafiroff.com/chevy-pump-ga ... d-sr20.php

I believe everything I read on the net. Never the less they dont give out anything on the cam anyway.

[CamKing]

CamKing, how aggresive are your lobes and how much spring would they need with steel valves?

They're not real aggressive, but how mild can a .500" lobe be ?
You would need 275-300# on the seat, and 780-830 @ Max lift.

[bob460]

CamKing, how aggresive are your lobes and how much spring would they need with steel valves?

They're not real aggressive, but how mild can a .500" lobe be ?
You would need 275-300# on the seat, and 780-830 @ Max lift.

How many miles will lifters last with them spring pressure's?

[AA Performance]

They're not real aggressive, but how mild can a .500" lobe be ?
You would need 275-300# on the seat, and 780-830 @ Max lift.

How many miles will lifters last with them spring pressure's?

I would think you would get between 2000-2500 miles with needles at best, maby if your lucky

[ProPower engines]

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.

[mopardave]

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.

[CamKing]

They're not real aggressive, but how mild can a .500" lobe be ?
You would need 275-300# on the seat, and 780-830 @ Max lift.

How many miles will lifters last with them spring pressure's?

With good lifters, 20,000+
Being a 632ci engine, it's not going to see much time above 6,500rpm.

[travis]

I would recommend a 273/283@.050", .500"/.485" Lobe Lift, 115 LSA

The reason for the longer exhaust durations, is that with an over-square 2-valve engine, you don't have enough exhaust valve area, so you need to add duration to evacuate the cylinder.

Is that the reason for the wide LSA as well, to start the exhaust earlier with the undersized exhaust valve area?

[bob460]

How many miles will lifters last with them spring pressure's?

With good lifters, 20,000+
Being a 632ci engine, it's not going to see much time above 6,500rpm.

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.

[ProPower engines]

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.

[bob460]

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.

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.

[AA Performance]

How many miles will lifters last with them spring pressure's?

With good lifters, 20,000+
Being a 632ci engine, it's not going to see much time above 6,500rpm.

20,000 miles???? You serious??? What are you running over the nose, 350 - 400 lbs.

[AA Performance]

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.

[CamKing]

How many miles will lifters last with them spring pressure's?

With good lifters, 20,000+
Being a 632ci engine, it's not going to see much time above 6,500rpm.

20,000 miles???? You serious??? What are you running over the nose, 350 - 400 lbs.

Try 800lbs at max lift.
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.

[AA Performance]

With good lifters, 20,000+
Being a 632ci engine, it's not going to see much time above 6,500rpm.

20,000 miles???? You serious??? What are you running over the nose, 350 - 400 lbs.

Try 800lbs at max lift.
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.

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.