L98 Cylinder Head Flow Numbers
Thread Starter
Senior Member
Joined: Jul 2003
Posts: 543
Likes: 2
From: So Cal
Car: 1989 IROC-Z
Engine: 350 TPI
Transmission: 700R-4
L98 Cylinder Head Flow Numbers
I was wondering if someone can list the flow numbers for my stock L98 iron heads? From .100 to .600 lift. Also, how drastically can a mild port and polish job change the numbers? I just need and idea of what numbers I can expect so I can plug stuff into desktop dyno. Thanks.
Supreme Member
Joined: Jan 2002
Posts: 3,852
Likes: 1
From: Valley of the Sun
Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Intake .05-.60
29.000000
56.000000
120.000000
160.000000
186.000000
196.000000
199.000000
Exhaust .05-.6
27.000000
52.000000
104.000000
133.000000
150.000000
170.000000
175.000000
29.000000
56.000000
120.000000
160.000000
186.000000
196.000000
199.000000
Exhaust .05-.6
27.000000
52.000000
104.000000
133.000000
150.000000
170.000000
175.000000
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