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I have been looking for a crate engine for my 1990 Corvette with 400+ Hp. The problem is every time I talk to a company they either can not sell me a engine that will work with my computer system or there are so many modifications to be made it almost doubles the price of the engine. My drive train is complete to handle the power am am just looking for a company that sells crate engines that can be installed with the least hassle. My current engine is fine, it's just a dog! Would rebuilding be cheaper in this case. Any advise would be appreciated!!! Vettefast :banghead:
Re: 1990 C4 400+ HP crate engine Upgrade (vettefast)
'90 is a speed-density system so any significant upgrades will require new programing. A chip is one way to do this but I wouldn't do it that way because the fuel and spark curves you get will be sombody elses guesswork. Not optimum. A better (also more expensive) way to go is with a programable computer. That way you can keep tweeking your programing until you get every last HP your engine has to offer. A chip might short you 50 or so. Also with a programable computer you can store different programs for max HP, fuel economy, emmisions, your kid driving the car, ect... and change them with a few keystrokes on your laptop while your driving down the road.
Re: 1990 C4 400+ HP crate engine Upgrade (rkessel)
MY KID DRIVING MY VETTE! HEY!!!!!!!!!!!!!!!!!!!!!!!!!!!
Thanks for the extra info. The company that burned my chip has advised me that when I change over if they do not burn the chip to my satisfaction they will reburn it. Like you I am limited in funding. Vettefast
Re: 1990 C4 400+ HP crate engine Upgrade (Trizney)
LTR TPI = Large Tube Runner Tuned Port Induction.
As for your budget it greatly depends on how far you want to go... I can build you a nice, cast crank/forged piston 383 for a little over $5k but the induction would add additional cost.
Or, and nobody's mentioned this: You could simply do a heads/cam/induction swap on your stock short block. Provided your bottom-end is in good condition (perform a leakdown test) you can pretty easily achieve 400 hp on the factory 350. You can go one of two ways for heads; have your stock ones reworked with a good port job and larger valves. Or you could simply buy a set of aftermarket heads like AFR's 190's or Edelbrock's RPM's, or several others out there. Then choose a good cam; a lot of people like the LPE 219 cam and the LT4 'Hot' cam but I've got one that I prefer over them...Regardless a good 'street' cam is what you want. Roller rockers, long-tube headers and a good exhaust system. Then add either a large mouth base manifold and big runners/siamesed runners or an Accel SuperRam; then throw a good tune at it (call ski_dwn_it). That will give you an honest 400-425 hp at the crank. I ran this combo on my '90 for several years and it ran 12'oh's on motor on street tires, dipped into the high 11's on drag radial and with a 150 shot of N2O went 10.80's (until the 150 shot took out #8). You can do this for roughly $3k....