Hi all,
My brother has a 396 in a 69 Chevelle that I need to know what is the current compression ratio. He could never get it to stop pinging on 93 pump gas. I have torn the engine down to the short block and here are the head and piston numbers: Heads- 3872702, pistons TRW L2242F30, gasket appears to be a felpro blue. From what I can find, this head has a 98cc chamber. From the Summit catalog, these pistons have 10.58 compression with a 109cc head. Could someone help me figure the ratio with this 98cc head? Would it be possible to get the compression down to 9.5 or 10 with just a head change? If so, what head? Thanks in advance for any help!
Steve