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Cast iron L98 heads Vs. Aluminum L98

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Old Jan 7, 2001 | 02:16 AM
  #1  
GOLD85's Avatar
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From: Winnipeg,Manitoba,Canada
Cast iron L98 heads Vs. Aluminum L98

Are the cast iron L98 heads identical to the aluminum L98 heads, or is ther some flow differants.also are the bolt angles the same on both heads. i need some good heads for my 406.

------------------
when the green flag drops the bull$hit stops

Curent: 350,performer RPM intake ,650dp, 700r4, headers, 3inch exhast
Spring 01: 406, Comp 282 solid cam, 2400 stall converter, every thing else the same.

[This message has been edited by GOLD85 (edited January 07, 2001).]
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Old Jan 7, 2001 | 07:57 AM
  #2  
Mark305TBI's Avatar
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From: Huntsville, AL
Car: '00 Chevrolet Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
Not sure about differences in flow, but I do know that the aluminum L98's have 58cc combustion chambers as opposed to 64cc on the cast iron ones and pre-87 carbeurated style intake bolt angles.

-Mark W.
'88 SC Camaro w/ 305 TBI
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Old Jan 8, 2001 | 12:34 AM
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Kevin91Z's Avatar
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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 Aluminum L98 heads flow better than the iron ones, but for a 406 I'd definitely get the AFR 190 heads.

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