h.o.conversion 5 litre January 22, 2006, 10:25:11 AM Does anyone know what comression ratio and horse power to expect when installing e7te heads,19# inj.,h.o pleneum,mass air,h.o. cam; on an 86 roller block with stock flat top pistons? Quote Selected
h.o.conversion 5 litre Reply #1 – January 22, 2006, 11:07:30 AM compression wont be much different than one with valve reliefs. Youll probably make the same 225ish horsepower as an HO 5.0 Quote Selected
h.o.conversion 5 litre Reply #2 – January 22, 2006, 04:21:28 PM From what I've seen, compression nears somewhere around 9.5:1 with flat top pistons and E7's. Bu that's what the calculators say... Quote Selected
h.o.conversion 5 litre Reply #3 – January 22, 2006, 08:05:28 PM Yeah it is 9.1:1 Stock HO motors are actually 8.9:1James Quote Selected
h.o.conversion 5 litre Reply #4 – January 22, 2006, 10:20:32 PM so how with flat tops do you get more? is it bc of the valve relifes in the pistons ? Quote Selected
h.o.conversion 5 litre Reply #5 – January 22, 2006, 11:44:40 PM 190-220 flywheel h/p on a fresh stock spec shortblock. Quote Selected
h.o.conversion 5 litre Reply #6 – January 23, 2006, 12:06:32 AM you can get a good idea with this calculator http://kb-silvolite.com/calc.php?action=comp and you can get exact compression with this one http://kb-silvolite.com/calc.php?action=comp2 sorry i can help any more then this Quote Selected
h.o.conversion 5 litre Reply #7 – January 23, 2006, 10:05:32 PM I thought H.O.pistons were dished with valve relief?Are 86 flat tops cast? Quote Selected
h.o.conversion 5 litre Reply #8 – January 23, 2006, 11:17:31 PM HO just has valve reliefs, no dish Quote Selected
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