I mocked up the motor tonight and came up with the following clearances:

Crankshaft endplay: .0055
rod-to-rod gap: .020
piston to deck height: .020

The one i'm looking at is of course, is how far the piston is sitting in the hole. With the Fel-Pro 1074s, I end up with a .059 quench height; not good.

-Should I zero deck the block to get the quench down to .039? Or should I just use the .029 Impy gaskets and only drop my quench down to .049 and will that be tight enough on the 8-10 lbs of boost I plan on running?

- If I need to deck the block, can I do so without distorting the cylinder bore, or do I need to have the torque plate hone redone as well?

-Tightening the quench of course will raise my compression, but i'm going to open up the head chambers from their current 52 CC to around 58; giving me 9.2 to 1 on the .029 gasket or 9.4 to 1 on the decked block option.

To summarize, which is better. 9.2 to 1 w/.049 quench (.020 deck height) or 9.4 to 1 w/.039 quench (zero deck height)?

Cheers,
John

 

I'd go with the .039 quench and 9.4 compression. The 9.4 is will be good with the modest boost and can take even more. Are you using dished pistons? You know that will mess your quench.

 

I'm using the Wiseco Tru-Forged, D shaped dished pistons.