thats a basic heads/cam package with aftermarket dual beehive springs, pushrods, and ported tb/intake. Its expensive considering you can now get a set of the l92 heads, which fit our 6.0L 4.00" bore with no problem and your basically getting a ls7 type of head design to fit our 15* valve angle for under 300.00 a pair.
I have a 410ci motor in my camaro that turns 640rwhp on pump gas through a 6-speed. on a stock cubed, 346, my buddy and i have a heads/cam package that makes 500rwhp and 460rwhp through a 237/242 cam at 114lsa. This car idles great and with the mentioned HPtuners, we turn over 24mpg on the highway, about 18-19 mpg on the street, narrow-band tuned.
Those numbers on that site are crank hp, it would be difficult to make 435rwhp with an auto, unless you locked the converter on the dynojet, that is if the stock 4l60e trans can hold the power and had ONE HELL OF A TUNE AND a 90mm intake and every otherbolt-on available for this motor. Also, the trans is not a very strong... now the 4l80e, which i would of initially put into this rig, is stock rated at 750rwtrq. this trans (4l60e) is rated at 360ish rwtrq. anythig over stock, and your asking for it. (ask me how i know!
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The above mentioned heads, l92, can run you NEW from GM for about 200.00 a pair. A comp cam is about 399.00... ANY cam spec you wish. I would suggest some like a thunderracing cheatR cam, makes gobs of mid-range torque. Now, add the springs, pushrods, a port oil pump... anbd you should be anywhere under the 2500.00 dollar range. Porting a stock TB and intake will yield some more power but not enough... i would get a fast 90mm setup and really step it up.
Combine all of this with an aftermarket stall, like a yank 2500, (retains good towing ability) and you'll trap alot faster and get into the powerband easier without starting from the deadspot under 3k. I would suggest a good trans cooler, to get her temps down... and hope the trans stays together.
NOW, you could go supercharger, which is alot of fun really. Probably the first thing i would do.....but this is where you have some choices. You have the eaton/magnacharger. the (112) is a great blower but will run out of steam on top. They developed a newer blower, (122) which will now allow you to run a 90mm TB and make good power on top. Very noticeable. Than there is the whipple and my favorite, the KB. The Kenne Bell has a great blower that will make huge power over the magnacharger, its intercooled and has less parasitic loss (not much though) than the roots style blowers. (magnacharger)
Than there is the ATI procharger, centi. IT makes great power but its more linear and builds with rpm. You can get a D1sc and push over 20lbs... than you'll make great power. The ATI looks like a turbo, but runs of your accesories. So it has parasitic loss, but less than the roots. Also, you have the undergradeability to make HUGE power with a stock cubes, forged motor.
just some ideas... i have been in the lsx performance game for years now and basically, what we have in the H2 is a LS1 with a vortec intake and other misc. changes. Swap the intake, and you'll be hard pressed to tell the difference asethetically. You can have a built 408ci shortblock, for $3500-4k.. and that will make tons of power down low. Add a blower to that with a lower C.R. of 9.1:1 (est) and you should be able to get good power output of one of these motors. And if you get board, well, you can now have a lsx type of shortblock that can go as high as 480ci or and even 500ci SMALL BLOCK CHEVY.
MEth injection will help with a magnascharger, should be able to extend the limits of pump gas... but FWIW, i have seen 346ci ls1's make 900rwhp+ on pump gas at around 15psi or more.
02-12-2007, 11:05 PM
Re: What do you think of this engine performance upgrade?
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