Is there a difference between 5.7 heads and truck heads?
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Junior Member
Joined: Oct 1999
Posts: 19
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From: Marion, TX
Is there a difference between 5.7 heads and truck heads?
I don't have the casting no's of the truck heads in front of me, but I'm wondering if there's any difference between iron L98 heads and regular TBI, truck, or stock replacement crate engine heads. Are L98 iron heads anything special? Would they be an upgrade?
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
TBI truck heads usually have swirl-port intake passages, to induce a swirled air/fuel mixture into the combustion chamber to create torque. But some say it doesnt work and the iron L98 heads are better. I used these heads in my first 350 and got 225 HP and 335 TQ.
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
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