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Well i have ported and polished heads that i am putting on this weekend and we are going to re-ring the pistons b/c they are in good shape still. My question is

1. What headgasket will raise the compression up just a tad bit and what would that do for performance?

2. if i would do 2.25 inch from manifolds to the cat then 2.5 from catback would that do ne thing for performance?

thanks for your help guys
adam
 

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Chevy 3.1L vin "D" 3.1L TBI engines from the 91?-95 Lumina APV vans'..

0.040 compressed thickness..

i run them on my engine.
 
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