Comp Cams Valve Lash

Got a question. I have an iron head 460, running a Comp Cams 294B-8 solid flat tappet cam. Stainless valves. Roller Lifters.
The lash recommendations are.030 intake and exhaust. This seems a little big. Anyone running this? What would you set them at?
Thanks!

I don’t like them that loose, I’d try .020-.022

dfree383 wrote:I don’t like them that loose, I’d try .020-.022

x2

Ol Yaller 73 wrote:Got a question. I have an iron head 460, running a Comp Cams 294B-8 solid flat tappet cam. Stainless valves. Roller Lifters.
The lash recommendations are.030 intake and exhaust. This seems a little big. Anyone running this? What would you set them at?
Thanks!

That cam is designed with a .0175" lash ramp on the lobe so, .030" is the maximum HOT valve lash which should be run when using a 1.73/1 rocker arm.

I would set them wherever it runs the best between .012" and .030"; intake and exhaust do not need to be the same.

rmcomprandy wrote:

Ol Yaller 73 wrote:Got a question. I have an iron head 460, running a Comp Cams 294B-8 solid flat tappet cam. Stainless valves. Roller Lifters.
The lash recommendations are.030 intake and exhaust. This seems a little big. Anyone running this? What would you set them at?
Thanks!

That cam is designed with a .0175" lash ramp on the lobe so, .030" is the maximum HOT valve lash which should be run when using a 1.73/1 rocker arm.

I would set them wherever it runs the best between .012" and .030"; intake and exhaust do not need to be the same.

I agree 100%

I've run mine at .012 and .014 intake/exhaust (hot) because the loose lash tents to beat the crap out of the pushrod ends!!

BBFTorino wrote:I've run mine at .012 and .014 intake/exhaust (hot) because the loose lash tents to beat the crap out of the pushrod ends!!

If you stay on the intended lash ramp of that lobe profile, the contact velocity of a flat tappet cam will remain the same 99% of the time. It just takes less duration from there to get going faster up the ramp, sooner.

rmcomprandy wrote:

BBFTorino wrote:I've run mine at .012 and .014 intake/exhaust (hot) because the loose lash tents to beat the crap out of the pushrod ends!!

If you stay on the intended lash ramp of that lobe profile, the contact velocity of a flat tappet cam will remain the same 99% of the time.  It just takes less duration from there to get going faster up the ramp, sooner.

That's right most solid lifter cams have a constant velocity ramp for that very reason. On some old factory cams this area can be pretty long which should make the lash setting very forgiving in that some valves could be quite a bit looser and not make any more noticeable noise than one set significantly tighter. With this type of cam setting the valves tighter really doesn't do anything except add some duration.

Where most people screw up is with what to do with the lash when changing the rocker ratio. Since the lash setting happens at the valve it should be increased as the rocker ratio is increased to keep the contact points on the ramps (duration) the same.

Ol Yaller 73 wrote:Got a question. I have an iron head 460, running a Comp Cams 294B-8 solid flat tappet cam. Stainless valves. Roller Lifters.
The lash recommendations are.030 intake and exhaust. This seems a little big. Anyone running this? What would you set them at?
Thanks!

The question is why are you running a solid lifter camshaft with Roller lifters?

Albert Clark wrote:

Ol Yaller 73 wrote:Got a question. I have an iron head 460, running a Comp Cams 294B-8 solid flat tappet cam. Stainless valves. Roller Lifters.
The lash recommendations are.030 intake and exhaust. This seems a little big. Anyone running this? What would you set them at?
Thanks!

The question is why are you running a solid lifter camshaft with Roller lifters?

Albert is the only guy with a keen sense for the odious

Albert Clark wrote:

Ol Yaller 73 wrote:Got a question. I have an iron head 460, running a Comp Cams 294B-8 solid flat tappet cam. Stainless valves. Roller Lifters.
The lash recommendations are.030 intake and exhaust. This seems a little big. Anyone running this? What would you set them at?
Thanks!

The question is why are you running a solid lifter camshaft with Roller lifters?

YES ... that fact went un-noticed.
That sure should not be done ... ever.

I just figured he said "lifters" when he meant "rockers". He had just stated he had a solid flat tappet cam.
Maybe he can come back on here and clarify - oops or BIG OOPS.

294B-8 is a flat tappet grind number.

How about running roller pushrods with your solid rockers and plastic lifters??

BBFTorino wrote:How about running roller pushrods with your solid rockers and plastic lifters??

Let me ask you something? You just come on here to flap your lips and or to hear yourself don't you?

some of the things you spout off make as much sence as going to a proctologist to have your teeth worked on

Yours Truly Albert

Albert Clark wrote:

BBFTorino wrote:How about running roller pushrods with your solid rockers and plastic lifters??

Let me ask you something?  You just come on here to flap your lips and or to hear yourself don't you?

some of the things you spout off make as much sence as going to a proctologist to have your teeth worked on

Yours Truly Albert

OUCH

Albert Clark wrote:

Ol Yaller 73 wrote:Got a question. I have an iron head 460, running a Comp Cams 294B-8 solid flat tappet cam. Stainless valves. Roller Lifters.
The lash recommendations are.030 intake and exhaust. This seems a little big. Anyone running this? What would you set them at?
Thanks!

The question is why are you running a solid lifter camshaft with Roller lifters?

Good catch. I have the same cam and I even did not snap to the roller lifters and had to do a double take.

Guess it will take a bunch of the lope out with roller lifters, LoL.

rmcomprandy wrote:

Albert Clark wrote:

Ol Yaller 73 wrote:Got a question. I have an iron head 460, running a Comp Cams 294B-8 solid flat tappet cam. Stainless valves. Roller Lifters.
The lash recommendations are.030 intake and exhaust. This seems a little big. Anyone running this? What would you set them at?
Thanks!

The question is why are you running a solid lifter camshaft with Roller lifters?

YES ... that fact went un-noticed.
That sure should not be done ... ever.

Good catch on the lifters... I've seen that done a few times and one that I can think of was on a Chrysler 2.5 overhead cam engine that came in with a noisy valvetrain. They were known to break a cam once in a while out near the middle. This must have happened to this engine one time or another and somebody changed the cam but used the one for the non roller followers! The rollers wore a groove close to 1/8th inch in the lobes and put a bunch of crap into the engine but after swapping on the right cam it ran once again.

OOPS, I meant roller ROCKERS, not roller LIFTERS. Thanks to all the sharp eyes out there! I stand corrected.