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View Full Version : pre '89 head design differs from '89+


WadeT
03-22-2003, 03:26 PM
Pretty suprising suff!

Got this from another message board.

http://www.ma70.com/bishop92t/pics/hgswap/headdifferences.jpg

http://www.ma70.com/bishop92t/pics/hgswap/headrunners.jpg
Joseph
03-22-2003, 07:56 PM
Do 89 & up have higher HP than 87-88's?
Supra Bob
03-22-2003, 08:01 PM
What exactly effect would that have? How much of a flow increase would that give, ya think?
WadeT
03-23-2003, 12:20 AM
White_mk2, yes the 89+ have 2 more HP and 8 more FT - LB. of torque. Modified I have no idea what the difference might be.

Yea Bob, the 89+ ports appear to have more volume than the 87s. Some have stated that the 87s might flow better for N/A and the 89s better under boost.
Supra Bob
03-23-2003, 12:24 AM
I was thinking the difference kinda seemed like the difference between an single and dual plane intake.... which would agree with what ya just said :)