L98 Perf Upgrade
Thread Starter
Pro
Joined: Aug 2004
Posts: 623
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L98 Perf Upgrade
I pulled the L98 from my 86 to freshen it up. I would like to get it in the 300HP range. Any suggestion? I already have a set of headers and a true dual exhaust with no cats and flowmasters.
Team Owner
Joined: Sep 2001
Posts: 62,160
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
The headers and exhaust should already have netted about 20-25hp.
You should look at Vic'89s setup closely if you only want 300 or so.
You would need a better base manifold, TPiS or Accel, a fully ported plenum and a bigger set of runners like AS&M. If you already have the engine out, you could change the cam now to something with similar specs to the Tpis ZZ9 or LPE 211.
(these are rollers, 86 is not a roller cam, its a hyd flat tappet)
If you have an Iron head engine, you should really replace those with something better, but you dont really have to to get this power level.
You should look at Vic'89s setup closely if you only want 300 or so.
You would need a better base manifold, TPiS or Accel, a fully ported plenum and a bigger set of runners like AS&M. If you already have the engine out, you could change the cam now to something with similar specs to the Tpis ZZ9 or LPE 211.
(these are rollers, 86 is not a roller cam, its a hyd flat tappet)
If you have an Iron head engine, you should really replace those with something better, but you dont really have to to get this power level.
Racer
Joined: Feb 2002
Posts: 293
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From: Benoni Gauteng
Originally Posted by lefoy84
I have access to a set of aluminum heads from an 86 L98 and a set from an LT-1. What is the difference and which ones should I get?
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
LT1 heads wont work for you.
The '128 aluminum heads from a 86L-87 would be better than the 86E heads you have, with portwork and a 3-angle valve job they'll be really good.
The '128 aluminum heads from a 86L-87 would be better than the 86E heads you have, with portwork and a 3-angle valve job they'll be really good.
Thread Starter
Pro
Joined: Aug 2004
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Originally Posted by vader86
LT1 heads wont work for you.
The '128 aluminum heads from a 86L-87 would be better than the 86E heads you have, with portwork and a 3-angle valve job they'll be really good.
The '128 aluminum heads from a 86L-87 would be better than the 86E heads you have, with portwork and a 3-angle valve job they'll be really good.
Team Owner
Joined: Dec 2000
Posts: 21,094
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From: Phila., PA burbs
Originally Posted by lefoy84
I am new to this Forum. How do I find Vic'89s setup. It does have cast iron heads.
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