L98 Hot cam
Thread Starter
Racer
Joined: Jun 2007
Posts: 367
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From: Springfield MA
L98 Hot cam
ok i got an hot cam kit (with rr and springs) and i need some advice for my 89 l98 (stock)
Ive been thinking about a first injection intake.(pcm4less tune)
should i get new heads, port my 113, or leave them.
i would like ~400hp
Edit: i have longtubes and a 3in system
Ive been thinking about a first injection intake.(pcm4less tune)
should i get new heads, port my 113, or leave them.
i would like ~400hp
Edit: i have longtubes and a 3in system
Last edited by rube1975; Mar 12, 2008 at 12:02 PM.
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Hotcam will be better suited to a Miniram/LT1 intake, not the First.
If I was going with the First, i'd port the '113s. Otherwise I'd get bigger heads, thats the only way I see you getting close to 400chp.
You'll need headers and RR to get there even with the MR/LT1.
If I was going with the First, i'd port the '113s. Otherwise I'd get bigger heads, thats the only way I see you getting close to 400chp.
You'll need headers and RR to get there even with the MR/LT1.
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
The intakes can pull over 7000, so to protect the bottom end you'll just need a rev-limiter...something like an MSD Digital 6 box.
If its old/high mileage to the point where it cant handle 6000-6500, then I wouldnt be hoping for anywhere near 400chp.
If its old/high mileage to the point where it cant handle 6000-6500, then I wouldnt be hoping for anywhere near 400chp.
Le Mans Master
Joined: Jun 2006
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From: One day you're a Comet...the next day you're dust... Arkansas
Super ram, 219 cam, good after market heads, full RR's, headers, and tune will get you to 400 CHP on stock bottom end at reasonable RPM. Set the heads up to take the lift and RPMs.
Melting Slicks
Joined: Apr 2007
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400 hp out of an L98 is a tall order w/o extensive engine mods; I've been there and took my car to that level and beyond from stock...I would recommend aftermarket aluminum heads that flow much better...you can throw money in your existing heads, but with today's technology, heads have come a long way.....don't know the specs on your cam, but I would also go with a miniram or if you can modiify an LT1 intake, that would fine too........the stock long runner, intake stuff has to go to get close to 400hp, no matter what you do to the lower end....good luck....
Last edited by 856SPEED; Mar 12, 2008 at 10:36 PM.
Instructor
Joined: Dec 2006
Posts: 195
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From: Savannah Georgia
actually there was an article in Corvette Enthusiast March 08 issue that was a pretty good read. They did a L98 build using a TPI system just to show that it would support over 400hp, think they ended up with something like 420hp @ 5000rpm and 490lb-ft of torque @4000rpm using oe plenum and intake ported of course and after market runners. anyway, it was a good read, you should check it out if your wanting to stay with a tpi style system, be it oem or first injection. good luck with your build 
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Thread Starter
Racer
Joined: Jun 2007
Posts: 367
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From: Springfield MA
ok so everone says start with the cam and then pick your heads so what do i need for the hot cam
is there some equations that i could work with???
PS PurtyLilC4 would love to see that article
is there some equations that i could work with???
PS PurtyLilC4 would love to see that article
Le Mans Master
Joined: Jun 2006
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From: One day you're a Comet...the next day you're dust... Arkansas
You could buy Brodix IK 180 heads, have them shaved to a 58cc combustion chamber, and sell your 113 heads for $300 - $400. That would give you a net cost in your heads of @ $800.
Team Owner
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
The stock heads in their stock form are good to about 350HP.
Thread Starter
Racer
Joined: Jun 2007
Posts: 367
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From: Springfield MA
do i need 180cc or 190cc maybe 200cc im not not sure
if i made the jump to vortec heads would i need new long tubes headers?
will they still bolt up
is there an adapter plate?
if i made the jump to vortec heads would i need new long tubes headers?
will they still bolt up
is there an adapter plate?
Last edited by rube1975; Mar 16, 2008 at 06:51 PM.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
Thread Starter
Racer
Joined: Jun 2007
Posts: 367
Likes: 0
From: Springfield MA
Team Owner
Joined: Oct 2004
Posts: 35,065
Likes: 0
From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
hwat do you think about these trick flows
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
You'll loose too much compression if you go with them in their off the shelf form.
Both sides (block and intake) have to be milled.
That goes with any heads.
Drifting
Joined: Feb 2003
Posts: 1,978
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From: San Antonio Texas
The chamber on those Trick Flows are 56CC; no milling required. As for the Vortecs... exhaust manifolds/headers will work fine. The Intake manifolds will not interchance, they must be for Vortec heads. Vortecs have 64CC chambers and will require milling to 58CC, unless you are changing pistons too. You should do some research in the "Search" section...a lot of info there.
Last edited by Curveit; Mar 17, 2008 at 02:16 AM.
Le Mans Master
Joined: Aug 2000
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From: Australia
Vortec heads bolt up , have same exh pattern but you need a aftermarket intake.Only 8 intake bolts not 12 like regular SBC and ports tall and thin.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
hwat do you think about these trick flows
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Those are bare heads, you can get Brodix COMPLETE heads for $1000 with bigger valves. Go to www.brodix.com
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
Better re-read the ad...Those heads are complete, with stainless valves, springs, and everything. You don't have to have them milled either. Just for the record... big valves; without the proper port, can actually hurt flow and velocity. Especially on the Intake side; not as critical on the EXhaust.