How much better are 1986 IROC 305TPI heads then my stock 1992 LO3 heads?

 

ttt

 

BC,

Do you have a casting number from your LO3 heads?

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Later,
Vader
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"Get UP - Drop the bombshell!"
Adobe Acrobat Reader

 

nope dont got one but they are stock LO3
where can i get the casting number

 

86 TPI heads are 416 casting. I forget the casting # of TBI heads. TBI uses the "swirl-port" design, which puts a giant blockage in the intake path to promote re-mixing of the air and fuel, since, like in a carb motor, the fuel has a tendency to separate out from the air at low velocites. This of course makes them inferior for anything that requires unobstructed flow, but promotes better low-end torque with the lean mixtures required for emissions compliance.

The 86 heads aren't particularly good, but they are one of the better 305 heads. However they have perimeter-bolt valve covers and early-style intake bolt holes, unlike TBI engines.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Are you sure that 86 heads have center bolt valve covers? I thoght that 87 and later had them and the 86s had perimeter bolt pattern

 

I have a set of 305 TPI heads I was going to put on my L03...but I decided to forget it and put on Torquers when I have a little more cash. It'll push me close to 300 HP without the juice on, that's for sure. I am gonna sell these 305 TPI heads.

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1992 Camaro RS (Auto) 5.0L TBI
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