piston deck ss engine
 

I have an issue with my small block chevy . The piston is .002 over the block on the left cylinder bank and .002 down on the right bank . Is it legal to use a thicker head gasket to correct the piston deck clearence ?

Thank!

Re: piston deck ss engine
 

Yes. The .004" difference probably would be insignificant otherwise. Next time its down for a rebuild, get the deck heights equalized.

Re: piston deck ss engine
 

I am not sure you can run a deck above block. That is the way the rule use to read.

Re: piston deck ss engine
 

If deck height is suppose to be below deck that's what it has to be. Even when it's suppose to be above block it has to be above.

At least that's the way I remember it.

Re: piston deck ss engine
 

Oops. I didn't remember the legality of that issue. I never had a plus deck engine like that. Better find a way to make it a minus deck engine. If you have rods with the small end bushed, it might be wise to rebush them and offset the pin bore a few thousandths. Otherwise, it's block time again.Best wishes on your project!!

Re: piston deck ss engine
 

Since we are talking an SS engine, just deck the pistons.

Re: piston deck ss engine
 

Guys , That plus deck , minus deck rule had been rescinded 6-7 years ago.
I remembered that, but I called the guys at Rick Watters to confirm.
They build them either way as long as the math adds up, and have been for a while.

Re: piston deck ss engine
 

Check section 11a pg 3" Gaskets" in 2013 NHRA rule book

Re: piston deck ss engine
 

In the STOCK section 10A page 4 in the ruel book under GASKETS.

Re: piston deck ss engine
 

Good! It's very clear in the rule book. Yes, you can use a thicker head gasket to compensate for the deck height being insufficient.

Class racer is full of good tech info .
Thank! everybody for your help.
Sincerely!