I have a stock bottom end 350 with new bearings, gapped rings, and a high volume oil pump. I'm putting lt1 aluminum heads on it with a static compression ratio of around 10.2:1 and a dynamic compression ratio of around 8.1:1 could the stock bottom end handle that on 91 octane. Or will I be eventually be referring to this engine in the p*** tense.
Dynamic ratio is rated in "pressure". Try again..! 10 to 1, with aluminum heads...you "should" be fine with todays gas, depending on the overlap ground into your cam. Tight lobe center, good, wide lobe center, bad. Mike
Detonation is what you are trying to avoid. Quench distance will play an important role here. With those aluminum heads, you need to run a composition gasket like Felpro 1003 @.041" compressed thickness. Steel shim gaskets will fret the head. The thinnest composition gasket I know of is .026". This all leads up to trying to achieve correct quench of .035" to .045". In order to achieve.035" to .045" quench with aluminum heads the block must be decked. In your case, if your quench is terrible you may have detonation. Good quench-- probably not. All that said, I run 11.3:1compression on the 383 in my 27 roadster. It has .035" quench with the pistons .005" out of the hole. Never a problem.
The Jalopy Journal
