All L98 experts please chime in
Le Mans Master
Joined: Jan 2002
Posts: 5,320
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From: Kyle TX (Because Mojo Made me fill it in)
Re: All L98 experts please chime in (Damien89)
Im no expert, but yes those did. So did the 88 vettes too I think. As for the difference, cant help you with that. Sorry.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Re: All L98 experts please chime in (Damien89)
During the 1986 production year, the 128 or 129 (not sure of the number) aluminum heads were phased in. Prior to that all the heads were the 624 cast iron heads. The 128 (?) heads have a conventional Chevy "square" exhaust port. The 113's have the "D" shaped exhaust port. Besides the easily recognized exhaust port, the 113 heads breathe better, both intake and exhaust. 1992 and up are LT engines. That covers the C4s. Good luck, and...
RACE ON!!!
RACE ON!!!
Safety Car
Joined: Jun 2000
Posts: 4,870
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From: Long Island, NY
Re: All L98 experts please chime in (Damien89)
I it true that 89,90 and 91 year corvette's had #113 heads? if true what's the difference from the other year's? :chevy :chevy :chevy
Vic
Melting Slicks
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From: 1,000,000,001 Posts
Re: All L98 experts please chime in (CFI-EFI)
During the 1986 production year, the 128 or 129 (not sure of the number) aluminum heads were phased in. Prior to that all the heads were the 624 cast iron heads. The 128 (?) heads have a conventional Chevy "square" exhaust port. The 113's have the "D" shaped exhaust port. Besides the easily recognized exhaust port, the 113 heads breathe better, both intake and exhaust. 1992 and up are LT engines. That covers the C4s. Good luck, and...
RACE ON!!!
RACE ON!!!
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: All L98 experts please chime in (Damien89)
The aluminum 128 head started in mid 86, and continued thru 87. They then made some small changes in design and changed the exhaust port for the 113 head in 88. Its a very light head, weight wise, and flows well enough for most moderate small-block combinations. When you start pushing things over 400hp, they can choke you, if ported. Unported theyre supposed to be good until you get around 350hp.
[Modified by vader86, 3:02 PM 1/25/2004]
[Modified by vader86, 3:02 PM 1/25/2004]
