Valve lash adjustment

Ronald Weishaar · Oct 29, 2018

lost the spec sheet on my cam and don't know the make or lift. I do know it is a flat tappet mechanical cam. How can I find out what the lash to set in/ex? Forgot to mention that is a 440 big block. I thought it was either a M/P or Comp some where around a 509 or better.

Roughbird72 · Oct 29, 2018

Ronald Weishaar said:
lost the spec sheet on my cam and don't know the make or lift. I do know it is a flat tappet mechanical cam. How can I find out what the lash to set in/ex? Forgot to mention that is a 440 big block. I thought it was either a M/P or Comp some where around a 509 or better.

You're going to have to have more info than that, cam grinders/brands vary on lash. Does the cam have numbers on it?

threewood · Oct 29, 2018

Aluminum or iron heads matter too.

Ronald Weishaar · Oct 29, 2018

threewood said:
Aluminum or iron heads matter too.

It has Indy EZ 440-1 heads. Had the cam out long ago and it had no markings. I thought the M/P cams were like this with no markings. I did find some notes of a M/P P4120661. What if I adj it to 28/32. any foreseen problems

doublekrossd · Oct 29, 2018

mine is called out for .016 int and .018 exhaust when hot on the cam card. Indy EZ 440-1 heads? EZ is a different head than the 440-1 but that shouldn't change much since they are both aluminum. I also believe that what rockers you use can effect the lash as well, i.e. aluminum or steel expand at different rates...

383man · Oct 30, 2018

Are you sure its a solid cam ? The MP .509 is a hydraulic cam. If you know for sure its a solid cam then I would set them around .024 and give it a go. I used to set my .557 cam at .024 on both lobes. Which on a cold aluminum head car would mean set them around .018 which will get you in the ballpark. Ron

dvw · Oct 30, 2018

The part number you listed is a Mopar .557 solid. The factory numbers I believe are .028/.032 hot. That with aluminum heads would be about .022/.026 cold. Better a little tight than loose, easier on the valve train.
Doug

Ronald Weishaar · Oct 30, 2018

383man said:
Are you sure its a solid cam ? The MP .509 is a hydraulic cam. If you know for sure its a solid cam then I would set them around .024 and give it a go. I used to set my .557 cam at .024 on both lobes. Which on a cold aluminum head car would mean set them around .018 which will get you in the ballpark. Ron

I had just set the lash at 20/22 when I started questioning the lash

dvw said:
The part number you listed is a Mopar .557 solid. The factory numbers I believe are .028/.032 hot. That with aluminum heads would be about .022/.026. Brtter a little tight than loose.
Doug

I had just set the lash at .020 and .022 when I started questing that setting. The .024 lash on both rings a bell from long ago! I was thinking of setting the lash at .024 but thought my mind was playing tricks. So, you think with aluminum heads I should go with .022/.026?

dvw · Oct 30, 2018

.020"/.022" old doesn't scare me. To be honest I believe Dwayne from PRH has a fair amount of experience with these cams and would be someone I'd ask.
Doug

Ronald Weishaar · Oct 30, 2018

dvw said:
.020"/.022" old doesn't scare me. To be honest I believe Dwayne from PRH has a fair amount of experience with these cams and would be someone I'd ask.
Doug

I don' know Dwayne or how to reach him. What does PRH stand for? So, you think the cold setting of .020/.022 will be OK! If so, that would save me from taking all apart to readjust.

1967coronet440 · Oct 30, 2018

@PRHeads

Valve lash adjustment

Ronald Weishaar

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Roughbird72

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threewood

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Ronald Weishaar

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doublekrossd

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dvw

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