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. That would open up more cam options too, and id bet you could find power up to the 272 range with ~520 or so.įor carb I would stick with a 750 Holley like the 0-80770, its a 770 street avenger with electric choke and vacuum secondarys, and a capable carb for performance while not losing streetability.The ZZ4 is a well-matched combo from the factory. You could order those and have the valves cut and some exhaust work done on the heads at the same time by a machine shop. GMPP makes 'performance spring kits' that are relatively cheap. Ive contemplated this as an engine build several times, you can build this using 100% new components for around $2500. It doesn't work any more but I used to have a dyno sheet of a 350 with hyper pistons (5cc), vortec heads, XE268H, Eddy RPM Air Gap, 750 holley SA, 1-5/8ths full length headers, flowmaster super 40's, and a TH350 making 321hp at 5800rpm at the wheels. I cant really speak to the lunati either way. With the amount of support that Comp gives to racers, and the level of quality and technical support, I pretty much only look at them for camshafts. Thoughts on cam selection? I don't believe this block is setup for a roller cam.So, stick with the stock one for now? Hydraulic flat tappet? Lunati? Comp Cams? 262? 268? Thanks. Will my 600cfm Eddy be enough? Or would the 650cfm Edelbrock AVS be a better fit? Would the 800cfm Edelbrock AVS be too big? If I buy a new carb now, it needs to be sufficient for the LS swap as well. I'd like to keep the heads the way they are.I'll be installing the new heads and intake sometime in the next couple of months, and it just needs to hold me over for a year or two when I do a 500+hp LS swap. It is a very stock 350, casting numbers 10054727, '87-'95, center bolt valve covers, non-vortec, summit racing headers, and an Edelbrock 1406 600cfm carb.

I just picked up a clean used set of Vortec 906 heads (assembled w/valve springs, self aligning rocker arms) with a Edelbrock Vortec RPM intake and am looking for some suggestions. Looking for a few opinions on carburetor, camshaft, etc. Hey guys, I posted this over on TC as well, but looking for all the advice I can get.

Vortec 350 with gm hot cam