lr172

I have a '69 427 (L-88 engine) on the '75 that I just bought. It has mechanical lifters and I would like to set the valve lash. Can anyone tell me what the recommended valve lash is for this engine?

I had the valve cover off to replace the gasket and to check the casting #'s on the head. One of the valves was quite looser than the .024 that I thought may be the suggested lash.

I would appreciate some guidance here.

Bob Onit

http://forums.corvetteforum.com/show...t=Solid+Lifter

lr172

Thanks for the reference here. The recommendations there vary quite a bit in the actual lash measurement. Does anyone know what was recommended lash is in the Service Manual for the '69 L-88?

TheSkunkWorks

L88 cam # 3925535 lash should be .020" hot for both intake and exhaust, per Chevy Power Book.

lr172

Thanks for providing this. I appreciate it.

The other post referenced going about .005 - .006 tighter when cold (aluminum heads). I think I will try that.

I saw reference to an adjustment method where the crank is rotated in 90 deg. increments and another method where you check the exhaust when the intake is closing and the intake as the exhaust is opening. Will both of the work effectively? Any suggestions on which is easier

TheSkunkWorks

Short of having an indexed balancer, I like the check E @ IC / I @ EO method myself.

Once you do a hot lash, then let it cool competely and recheck, you'll know the correct cold lash.

morganjd

On The 074 L88 Heads, The Difference Between Hot An Cold Is .006, Checked It 3 Different Times And Always The Same. I Let It Sit Overnight And Lash Em Cold Using The Eoic Method