What is the SCR with a 72cc head? 
larger than 72cc chamber heads?
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with a 28cc dished piston, assuming you are using stock thickness gasket, you will be at about 8.3 to 1
by my calculations, providing you use a .040 gasket with a 4.060 gasket bore, you will need a 20 cc dished piston, or with a 28 cc dished piston you will need to mill your heads to 63cc's
by my calculations, providing you use a .040 gasket with a 4.060 gasket bore, you will need a 20 cc dished piston, or with a 28 cc dished piston you will need to mill your heads to 63cc's
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Verdad Gallardo Give me your current piston cc spec, head cc spec, gasket spec and bore/stroke and deck height(if known) and let me calculate your SCR. Got to many different answers going on here.
Its 4.005 bore
Bore.......4.005
Stroke....4.00
Piston...... -32 cc
Head......60 cc
Head gasket bore....4.100
Head gasket thick....0.53
Meased piston out of hole ....0.005 out
Scr.......9.04 :1
Bore.......4.005
Stroke....4.00
Piston...... -32 cc
Head......60 cc
Head gasket bore....4.100
Head gasket thick....0.53
Meased piston out of hole ....0.005 out
Scr.......9.04 :1
I'd say good thinking tho. looks to be ballpark, but never 100% accurate until OP gives exact measurements.
I am the OP......lol... im building my own motor again ....the n/a style 403 i built yeilded a .005 out hole pistion so using the same company piston just -32cc this time give or take some thousandths.... head gasket is ls9 thats there specs....
