[Jay S]

Originally Posted by Formulajones

Thing is I'm not running any spring pressure to speak of. 135 on the seats is whimpy for a hydraulic roller ,, that's dam near solid flat tappet territory.

SBC doesn't need a ton of pressure anyway the valvetrain is pretty light. Not like a Pontiac or BBC where I typically run 150-160 seat pressure on a hydraulic roller

So to have sewing machine noise and also have one bleed down after sitting a bit with these little springs doesn't speak to well of the evolutions in my eyes.

If I remember right you have a Bullet cam in that SBC too. They are easier to make quiet than these XR comps. That should have been dead quiet. (Edit)think the Bullet is in the 327 has HLJ SE’s. I am not sure which engine has Evo’s?

[Formulajones]

Originally Posted by Jay S

If I remember right you have a Bullet cam in that SBC too. They are easier to make quiet than these XR comps. That should have been dead quiet. (Edit)think the Bullet is in the 327 has HLJ SE’s. I am not sure which engine has Evo’s?

That is correct the 327 has a bullet cam with HLJ SE's.
I just finished up a 383 (3000 miles so far) and put the evo's in it just to try them since they had rave reviews. Not working out for me.

[Jay S]

Originally Posted by Formulajones

That is correct the 327 has a bullet cam with HLJ SE's.
I just finished up a 383 (3000 miles so far) and put the evo's in it just to try them since they had rave reviews. Not working out for me.

What is the cam in the 383?

We took a G body with a 377 SBC to a few races last summer with a 242/248 XR comp. Which is the next step up from this 236/242 cam. It ran well, but was not quiet as far as sowing machine noise, it has the regular comp lifters, not the evo’s. We were shifting it a 6200, it nosed over hard after 6200.

[Formulajones]

Originally Posted by Jay S

What is the cam in the 383?

We took a G body with a 377 SBC to a few races last summer with a 242/248 XR comp. Which is the next step up from this 236/242 cam. It ran well, but was not quiet as far as sowing machine noise, it has the regular comp lifters, not the evo’s. We were shifting it a 6200, it nosed over hard after 6200.

The cam in this one is the summit 1203 hydraulic roller. LS fire order and 224 @.050
Idles nice and smooth and made peak at 5700 and makes 14" of vacuum. Perfect driver with lots of grunt. I have the trans setup to shift at 5800. It's a happy engine just lifters are noisy

[Jay S]

Originally Posted by Formulajones

The cam in this one is the summit 1203 hydraulic roller. LS fire order and 224 @.050
Idles nice and smooth and made peak at 5700 and makes 14" of vacuum. Perfect driver with lots of grunt. I have the trans setup to shift at 5800. It's a happy engine just lifters are noisy

I am familiar with those cams. That is a poster child for having an aggressive intensity. 50* intensity is 55 mm cam tunnel territory. I have done 49* before. It takes ultra ultra razor sharp lifter bleed rates to make that quiet with a SBC cam journal. They run good but usually you have to live with some noise. But I would have thought though the evo could handle it if any could.

[scott70]

Originally Posted by Jay S

I am familiar with those cams. That is a poster child for having an aggressive intensity. 50* intensity is 55 mm cam tunnel territory. I have done 49* before. It takes ultra ultra razor sharp lifter bleed rates to make that quiet with a SBC cam journal. They run good but usually you have to live with some noise. But I would have thought though the evo could handle it if any could.

How do you figure out what a particular cams intensity is?

[Jay S]

Originally Posted by scott70

How do you figure out what a particular cams intensity is?

Average Intensity =

Take Advertised Duration@ .006” tappet and subtract the .050” duation

287*-236*=51*

Smaller number means it is more aggressive.
.