rube1975

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

vader86

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.

rube1975

if i when with an lt1 or a MR wouldnt i have a problem with the stock bottom end? i mean with the peaks of both of the intakes being so high

vader86

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.

rube1975

40k i wouldnt call that old

do you know off hand if lt1intake.com sells emission legal version

BADDUCK

They appear to be shut down.
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.

856SPEED

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....

PurtyLilC4

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

rube1975

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

BADDUCK

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.

jsup

The stock heads in their stock form are good to about 350HP.

rube1975

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?

BADDUCK

!80 is plenty, more could hurt performance. I know very little about iron heads.

rube1975

hwat do you think about these trick flows
http://store.summitracing.com/partde...5&autoview=sku

jsup

The chamber is 67CCs. You'll have to have them shaved to 58CCs. But that's any head.

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.

Curveit

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.

rodj

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.

BADDUCK

Those are bare heads, you can get Brodix COMPLETE heads for $1000 with bigger valves. Go to www.brodix.com

Curveit

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.

BADDUCK

I don't know what ad you are looking at but if you look at the link in my post, those are bare heads. If valves and intake / exhaust flow is properly matched bigger valves will produce more power. Have you already been drinking green beer?