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. I have the LT4 Hot Cam in a Vortec 350, the cam is not the thing that will. A real 400HP with just a head swap? Maybe not- the stock ZZ4 cam is probably just too small to hit that number. Lift 19201171 - CPP Overhaul Gasket Kit - For HO 350 1248608602 Circle track. A small set of AFRs should blow them into the weeds. 525 Lobe Centerline ( deg): 112 Technical Notes: Service only for all V-8 engines with roller cams. 492 Maximum Lift (in) W/ 1.6 Rocker: Intake. This is a useful item for 305 owners, and it shows what a mild cam (LT4, 140), cheap GM head (Vortec), and exhaust swap could do provided you use a Vortec-matable manifold, and that a) the ECM were trimmed to provide the fuel needed, and provided that. And the Fastburn heads are nothing special in the world of aftermarket heads. 050' Lift( Deg): Intake: 218 / Exhaust: 228 Maximum Lift (in) W/ 1.5 Rocker: Intake. 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.

050' - 196 Lobe Centerline- 111 Is there a good factory cam that would be a good replacement out there, maybe an LT1 cam I know of an LT4 hotcam available locally, but I think that might be a. The heads and cam are dialed in to eachother to the point you can't really get much from a cam swap. I looked around and found the stock 元1 cam specs, which are: Intake lift-. vortec 350 lt4 hot cam, 1.5 roller rockers, summit carbureted intake ,summit 600 carb. The ZZ4 is a well-matched combo from the factory.

Lt4 hot cam vortec 350