how far can i go on stock l-98 heads
#1
Thread Starter
Joined: Jan 2003
Posts: 255
Likes: 1
From: indiana
Car: 91 Z-28
Engine: 420 sbc
Transmission: T56
Axle/Gears: 12 bolt/4.10 gears
how far can i go on stock l-98 heads
subject says it all. right now i am running 13.009 at 105mph on stock l-98 iron heads. how fast can they go stock. im surprised i got 105 out of them, but if there's more i want it.
#2
Supreme Member
Joined: Apr 2000
Posts: 3,187
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From: E.B.F. TN
Car: Tree Huggers
Engine: Do Not
Transmission: Appreciate Me.
airfoil
AFPR
edelbrock headers
random tech cat
flowmaster exhaust
Is this all the performance mods you've done on this car? What else? If you got roughly 50-70 HP from the above, I'd say go play the lottery next and consider yourself lucky. And the answer would be yes, you can get more if you haven't done anything else.
AFPR
edelbrock headers
random tech cat
flowmaster exhaust
Is this all the performance mods you've done on this car? What else? If you got roughly 50-70 HP from the above, I'd say go play the lottery next and consider yourself lucky. And the answer would be yes, you can get more if you haven't done anything else.
#3
TGO Supporter
Joined: Jul 2003
Posts: 4,803
Likes: 1
From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
Don't forget the Accel ignition to light it up.
Not sure I would call an "air foil" and "flow-not-so-well-master" performance mods really.
There is a little saying that goes something like this: "Heads make the power."
Not sure I would call an "air foil" and "flow-not-so-well-master" performance mods really.
There is a little saying that goes something like this: "Heads make the power."
#4
Senior Member
Joined: Jul 2003
Posts: 646
Likes: 0
From: P'cola
Car: 1991 Z28 Camaro
Engine: L98
Transmission: 700R4 that will magically turn into a 6 speed one day.
wow, more than 1 whole second shaved off the stock time with only bolt ons....with only a FEW bolt ons. Dang, I really can't wait to start modding my car now. You have NO head work done whatsoever? I am sure if you port them out a bit, you'd probably see a relatively good gain.
edit: I would also like to know the limitations of a stock L98 head. I have a goal of at least a 12.99999999 et without digging into the engine at all. Is this possible?
edit: I would also like to know the limitations of a stock L98 head. I have a goal of at least a 12.99999999 et without digging into the engine at all. Is this possible?
#5
Thread Starter
Joined: Jan 2003
Posts: 255
Likes: 1
From: indiana
Car: 91 Z-28
Engine: 420 sbc
Transmission: T56
Axle/Gears: 12 bolt/4.10 gears
sorry, forgot to list other mods. ive also upgraded to a tpis miniram, zz-409 cam, vigilante 3200 stall, 52mm throttle body, no cat converter, and the all important bfg drag radials. heads are untouched except for changing to the recommended springs for the cam. and i know im putting at least 320 horsepower to the ground to run that trap speed. so with a 15% driveline loss (more like 18% to 20%)thats still around 370 at the crank.
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#8
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Joined: Apr 2000
Posts: 3,187
Likes: 0
From: E.B.F. TN
Car: Tree Huggers
Engine: Do Not
Transmission: Appreciate Me.
and I was going to post you had to have a vig! Either that or you were going to get a BS flag.
Have you learned to whip out your own chips yet? This is on the 92 right? You could get a little more just from a dyno tuning session, but you're due for new heads.
Have you learned to whip out your own chips yet? This is on the 92 right? You could get a little more just from a dyno tuning session, but you're due for new heads.
#10
Thread Starter
Joined: Jan 2003
Posts: 255
Likes: 1
From: indiana
Car: 91 Z-28
Engine: 420 sbc
Transmission: T56
Axle/Gears: 12 bolt/4.10 gears
im pretty sure im close to 3500-3600 lbs. ive got power everything, a full interior, a/c that blows cold as hell and all aftermarket (and probably heavier) suspension components including the front sway bar. i havent tried the chip thing yet, but i do have diacom software and from what ive recorded, the tune is pretty much dead on.
#12
Thread Starter
Joined: Jan 2003
Posts: 255
Likes: 1
From: indiana
Car: 91 Z-28
Engine: 420 sbc
Transmission: T56
Axle/Gears: 12 bolt/4.10 gears
i know for sure that stock aluminum heads flow about 15 cfm more than the iron ones. plus you got a bit more compression too. what that equals in power output im really not sure
#14
Supreme Member
iTrader: (9)
Joined: Sep 2001
Posts: 2,984
Likes: 37
From: North Central Indiana
Car: 86 IROC
Engine: 383
Transmission: TKO 600
Axle/Gears: 3.54 Dana 44 IRS
well when i see times like that am usually pretty skeptical, but i cant really talk, i am goin 13.9 with a heads, cam, and converter 305 with stock chip and stock cat back with flowmaster muffler, and i am sure some people dont believe me. sounds like the mini ram and the cam are good friends, as are the converter and slicks. i would imagine that you are at the limit with your heads however. but i did want to congradulate you on fantastic times for a stock long block.
Last edited by 1MeanZ; 08-20-2004 at 08:59 PM.
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