2003 cobra hp increase?

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06-17-2009, 09:31 PM

#11

Smokin04

2nd Gear Member

Join Date: Apr 2009

Location: Near China now...

Posts: 314

Quote:

Originally Posted by Fobra

everybody and there mother makes 500+ on a stage 5 stieggy port, you dont think a 100 more cfm in the heads will do it... I beg to differ. I think 550-575 would be common place. In fact, a local guy here made 570 (was wrong).... but thats b/c im just liar and I make stuff up to impress you on the internet

But as far as just a blower swap... yes if you want to push 20lbs of boost and run race gas, its not reliable. Either way your going to have to push alot of boost, but imo the more you make with less boost the better off your are. The OP said he wasn't looking to spend a fortune, but the better heads would pay off in the long run if later decided to swap the blower. Honestly I just recommended the steggie because its a good cheap upgrade, I would get my heads ported and swap a 3.4 whipple if it were my car, it was just a suggestion... but Ill leave it to you pros to have the definitive internet decision

Come on man, don't get touchy. We're (or at least I) am trying to tell you (and the OP) that porting heads is a waste of money for a bolt-on car.

But you were right about one thing...570 is possible on an eaton car WITH race fuel and a small shot of spray. 500+ is a dime a dozen, but there is a big difference between 500 and 600. And from the factory, the BLOWER is the restriction NOT the heads. And if you want to get technical, the STOCK 03 Cobra heads out flow the Yates C3 NASCAR heads below .380 lift. And since factory cams don't go over .450, you can see why porting is a waste unless you are getting larger cams and/or a stroker (Big Cube) motor.

Bolting on a Whipple or KB is a way for RELIABLE 600+ HP. I know because I drove mine that way for 50,000+ miles. 2.4 KB, 93 oct, 18 psi, stock motor, 612 rwhp. Drove the car across country twice with no issues, pretty reliable if you ask me.

You're right about the OP saying he doesn't want to spend a fortune. Porting heads will cost exactly that...a small fortune. I agree that porting/pullying the blower is a cheaper alternative to the TS option, but it will yield nowhere near the power of a TS.

I also agree, more power with less boost is a sign of an efficient motor, and a benefit to every vehicle. But he can bolt on a set of long tubes and gain 3 psi in efficiency as well. Gaining 100 cfm in head flow will only matter if the air supply mirrors the gain equally. That is not physically possible from the eaton. Do a search on some other sites and take a poll. I bet you wont be able to find a single pump gas, non-N20 Eaton car making 600...even with a built motor.

Last edited by Smokin04; 06-17-2009 at 09:47 PM.