Print Page - h.o.conversion 5 litre

Title: h.o.conversion 5 litre
Post by: randy bedford on 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?

Title: h.o.conversion 5 litre
Post by: Tbird232ci on 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

Title: h.o.conversion 5 litre
Post by: David on 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...

Title: h.o.conversion 5 litre
Post by: srv1 on January 22, 2006, 08:05:28 PM

Yeah it is 9.1:1 Stock HO motors are actually 8.9:1

James

Title: h.o.conversion 5 litre
Post by: CougarCoupe88 on 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 ?

Title: h.o.conversion 5 litre
Post by: SLEEPER T-BIRD 87 on January 22, 2006, 11:44:40 PM

190-220 flywheel h/p on a fresh stock spec shortblock.

Title: h.o.conversion 5 litre
Post by: Sprayingsmooth on 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

Title: h.o.conversion 5 litre
Post by: randy bedford on January 23, 2006, 10:05:32 PM

I thought H.O.pistons were dished with valve relief?Are 86 flat tops cast?

Title: h.o.conversion 5 litre
Post by: Tbird232ci on January 23, 2006, 11:17:31 PM

HO just has valve reliefs, no dish

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Technical => Engine Tech => Topic started by: randy bedford on January 22, 2006, 10:25:11 AM