L98 cylinder head casting numbers.

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Sep 25, 2000 | 03:48 PM

JeffP

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L98 cylinder head casting numbers.

Hello all

I believe I am going to try to find a set of factory L98 heads for a 350 swap into my 89 IROC-Z when I get my money together. I am not trying to built a mega-horsepower motor, so I believe these heads will work with my budget.

Can someone post the L98 cylinder head casting numbers? Are the 87-92 heads the same for all years, or are they different? Any info is appreciated as always

THANKS
Jeff

Sep 25, 2000 | 04:16 PM

kevinc

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Joined: May 2000

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Car: 1982 Z28

Engine: LS1

Transmission: T56

http://www.mortec.com/

Sep 25, 2000 | 05:11 PM

Kevin91Z

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Posts: 10,950

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From: Orange, SoCal

Car: 1990 Pontiac Trans Am

Engine: 355 TPI siamesed runners

Transmission: Tremec T56

Axle/Gears: 12-Bolt 3.73

The stock iron heads are xxxx1083 castings. I forget the first 4 numbers. Yes they're the same for 87-92

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
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