474/.510) than your heads and tune will handle. The improved fuel-air mixture will improve performance and increase your vehicles horsepower by allowing for more efficient fuel consumption. My guess is that the ZZ4, while a really good cam (used a couple of 'em) for appropriate use, just might be a bit more &. Performance chips work by fine-tuning your 5.7-liter engines computer to create the optimal fuel-air mixture. Heads I am going to use are GMPP Fast Burn Vortec aluminum, already have. Its going to get some upgrades real soon. 040 over 305 block) with L98 aluminum heads. General Q & A - 350 EFI TBI Mods, cam, heads, intake, tune, 383 - I have a 97 Maxum 2100SR with the 350 EFI/TBI engine in it. 050 tappet lift (intake/exhaust) is 179/194 and maximum lift with 1. The cam in the TBI engine is just plain AWFUL. My brother needed one and I'm planning to use the other in a 336 (3.75 stroked. So START with a vortec 4.3L and run TBI on it. I bought two of 'em a few years ago just because they were cheap (for hr cams) at $140 for the pair shipped, off of ebay back when guys were replacing them in Ramjet and HT383 crate motors with stupid thumpy cams. Haven't used one myself yet, but everything I've read about it (and that is LOTS) makes me think it is something you ought to look in to, if you want good low to mid rpm grunt. Moderate lift and duration is supposed to wake up the stock 350 and still play nice with your oe heads and tune.
Class I crate engines generally produce up to 10 more. Find a store near you or shop online for car, truck, and SUV replacement parts. A Class I engine is the same JASPER general production engine, but with a mild camshaft upgrade. For what my 1 cent is worth I think the cam you are looking for is the GM "Ramjet" p/n 14097395 cam. Your local source for quality auto parts.
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