If you went with a mild cam upgrade and headers, this whole package might make 325 to 350 hp.Ī better upgrade would be to use one of the old ACCEL SuperRam intake manifolds. This could make upwards of 300 hp bolted to your existing engine. The TPI manifold isn’t known for its power production either since it uses very long, restrictive intake runners. Fuel Air Spark Technology (FAST) does offer a stand-alone retro-fit kit so you could use their FST-302000 that sells for around $750 and along with a TPI manifold. Edelbrock does not yet offer a retro-fit conversion EFI ECU and harness assembly for a multi-point application without an intake but that could change. We really like Edelbrock’s Pro-Flo4 system both from its simplicity and also because it is affordable. There are a couple of retro-fit EFI systems available. At this point, an aftermarket EFI controller (while technically not emission legal) would be a very smart move. This would require using a later model chip-based factory computer. If you wanted to stay with the basic engine, then a mild emission-legal camshaft, E.O legal aluminum cylinder heads, and a step up to a Tuned Port Induction (TPI) intake system would be in order. However, burdened with a stock Cross-Fire intake, power will still be limited. Hedman makes an emission-legal 1 5/8-inch primary tube header that looks pretty good and this will likely improve torque and horsepower. There are other ideas that will improve power like opening up the exhaust side with headers. This item isn’t cheap at more than $600 but it does retain the EGR valve. There actually is a performance dual cross ram intake manifold called the Renegade that is supposed to improve power. That process is fraught with road blocks. The problem is improving the breathing on this engine while maintaining its emission legality. The L83 has some good bones as a basic long block but is encumbered with a restrictive induction system and conservative cam timing. It didn’t take long for wags to tag the Cross-Fire as the Cease-Fire. of torque.Īdding insult to injury, this ‘Vette was cursed with what Chevrolet called the Cross-Fire EFI system which featured dual throttle bodies on what could generously be called a cross-ram manifold vaguely similar to the dual four-barrel intakes offered on the ’68-’69 Z/28 302 c.i.d. L83 engine that was rated at 205 hp and 290 ft.-lbs. Chevrolet carried over the ultra-lame 350 c.i.d. Jeff Smith: The ’84 Corvette was the first year of the C4 body style. What is the best way to get more out of it? I’d like to get 300 horsepower or more. I have an 1984 Corvette 350 that’s a real dog. With a stock LS6 intake, this engine made 475 hp and 440 ft.-lbs. We upgraded an iron truck 6.0L engine using stock pistons with a very mild 219 degrees at 0.050 Comp cam and mildly ported 5.3L truck heads to increase compression.
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