Gears or heads?
Melting Slicks
Joined: Jan 2008
Posts: 2,054
Likes: 120
From: AZ
Thread Starter
Instructor
Joined: Jun 2013
Posts: 225
Likes: 1
From: hanceville al
K/N filter, 52mm throttle body, ported plentum, eldelbrock high flow runner and intake, light head work, bigger valves, 24lb injectors, cam, punched over to 355Cub inch, long tube headers, no Cats, true duals, cat back exhaust and a tune.
Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
Heads wont do as much with long runner intake. I would do intake and heads if your heads arent really worked over and the cam is decent sized
If cam is small then heads may not be as great a bang for buck but still an improvement
Gears work for certain cars. 3.42's over 2.77 in my camaro felt awesome but 3.73 over 2.73 in my ls1 car did nothing at all. .1 in the 1/4 mile and you cant feel that
If cam is small then heads may not be as great a bang for buck but still an improvement
Gears work for certain cars. 3.42's over 2.77 in my camaro felt awesome but 3.73 over 2.73 in my ls1 car did nothing at all. .1 in the 1/4 mile and you cant feel that
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Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Heads!!!! Then get rid of that intake and go to something better. You can get some higher reving manifolds for around $500, or a you can go all the way with a Miniram. That will be the most bang for your buck. Don't go with the gears because they will put you out of your power range if you go to high. I spent $600 on my 3.75s with bearings and seals, another $200 at $50/hr to have them installed and I had to remove the differential case myself.
Melting Slicks
Joined: Nov 2013
Posts: 2,264
Likes: 3
From: Orchard Park NY
Check your RPO's to make SURE you know what gears you have. If you have 2.59's I'd say to gear down to the 3.07's. If you have 3.07's, I'd say grab some nice heads.
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
This^^^
This car has a pretty aggressive cam already, so gears would be my choice. Don't listen to the BS about an intake only if most of your driving is above 4000 rpm. The RPM limiting factor of the long tube design creates more power below 4000, so your seat of pants from the light is faster. If you live for the quarter mile then a short runner design is fine. Putting a Miniram on a stock L98 would be counter productive.
This car has a pretty aggressive cam already, so gears would be my choice. Don't listen to the BS about an intake only if most of your driving is above 4000 rpm. The RPM limiting factor of the long tube design creates more power below 4000, so your seat of pants from the light is faster. If you live for the quarter mile then a short runner design is fine. Putting a Miniram on a stock L98 would be counter productive.
Team Owner
Joined: Dec 2000
Posts: 21,094
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From: Phila., PA burbs
Max G’s
Joined: Nov 2008
Posts: 2,751
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From: Monroe OH
NCM Sinkhole Donor
This^^^
This car has a pretty aggressive cam already, so gears would be my choice. Don't listen to the BS about an intake only if most of your driving is above 4000 rpm. The RPM limiting factor of the long tube design creates more power below 4000, so your seat of pants from the light is faster. If you live for the quarter mile then a short runner design is fine. Putting a Miniram on a stock L98 would be counter productive.
This car has a pretty aggressive cam already, so gears would be my choice. Don't listen to the BS about an intake only if most of your driving is above 4000 rpm. The RPM limiting factor of the long tube design creates more power below 4000, so your seat of pants from the light is faster. If you live for the quarter mile then a short runner design is fine. Putting a Miniram on a stock L98 would be counter productive.
unless you plan to run the mile runs competitively or run tracks with a lot of long straights, your intake is fine. If I had your set up, I would step up to 3.07 rear ratio and put on the three piece underdrive pulley set. Remove the frisbee too if you haven't already. And, lastly you may look at 1.6 ratio roller rockers too.
Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
I disagree. My L98 made substantial power gains with a stealth ram swap on stock L98.
It had headers, converter and 3.42's already. In ice cold air the stock tpi went 13.63 at 97.
Nothin more than hsr swap and thats it it went 13.52 in mid summer air. I got that car down to 13.2's in cold air with underdrive pulleys. Thats a near half second gain in just intake in similar air conditions. Added drag wheels for 70lb reduction and 1.6 rockers and aggressive timing curve it went 12.95 at 104
Best tpi 60 ft was 1.75-1.76. Hsr went 1.70-1.71 same converter and stall. Shorter runners still make low end power
Intake on stock L98 picks up alot. If you have ported heads and cam the gains are even more pronounced
Adding better heads plus intake even more power with whatever cam is in it
It had headers, converter and 3.42's already. In ice cold air the stock tpi went 13.63 at 97.
Nothin more than hsr swap and thats it it went 13.52 in mid summer air. I got that car down to 13.2's in cold air with underdrive pulleys. Thats a near half second gain in just intake in similar air conditions. Added drag wheels for 70lb reduction and 1.6 rockers and aggressive timing curve it went 12.95 at 104
Best tpi 60 ft was 1.75-1.76. Hsr went 1.70-1.71 same converter and stall. Shorter runners still make low end power
Intake on stock L98 picks up alot. If you have ported heads and cam the gains are even more pronounced
Adding better heads plus intake even more power with whatever cam is in it
Last edited by Orr89rocz; Jan 9, 2014 at 04:20 PM.