Fix that first, then a bigger cam will have what it needs to build power higher up in the RPM range.ĪFR 180s (64cc chamber to maintain compression) + GMPP LT4 Hotcam would probably be well over 400HP, and still have very docile street manners. But the basic restriction in the motor is the heads, no matter how you slice it. A real 400HP with just a head swap? Maybe not- the stock ZZ4 cam is probably just too small to hit that number. The larger 268 didnt make dramatic increases in power, which points out just how. Heres a link to a guy thats running it, actually his build thread and he loves it. 525' lift on both sides (with 1.6 rockers) 112 LSA. I am brand new to the Chevy scene, I have a 1999 Chevy Tahoe 4DR 4X4 OBS with the 5. As far as cam specs go, here are the lt4 hot cam specs 218/228. A small set of AFRs should blow them into the weeds. is making 377 hp and an amazing 415 lb-ft of torque with a relatively mild cam. 1641 Views 2 Replies 2 Participants Last post by Cake.45, May 11, 2021. And the Fastburn heads are nothing special in the world of aftermarket heads. GM's "Fastburn 385" crate motor is the ZZ4 with the factory Fastburn Vortec-style heads bolted on top, generating 30 more HP with NO other changes. After you upgrade the heads THEN do a cam swap and you get the big payoff. A swap to a set of mild AFRs like the littlest 180s should be worth a much bigger bump in power than any cam swap. The core problem is that the heads just don't flow that well. GM tested that motor with the Hotcam and it picked up just a few HP at the cost of a few ft-lbs of torque. The heads and cam are dialed in to eachother to the point you can't really get much from a cam swap. Changing the cam timing will not change the LSA.The LSA is ground into the cam & it is what it is. The ZZ4 is a well-matched combo from the factory.
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