Anyway, back to the flycutting, you make a good point about the weight of the piston. My main problem seems to be too much piston and too small a head. ![]() I just want to use pump gas for the availability. If I have to, I will sell them (pistons). I just want to build this motor with existing parts I got. ALCOHOL!!!!!! not to drink but for the motor, Its a perfect combo for that. If your'e racing a class that requires pump gas, read above post, If it is a feul cost problem I have one last word. The 400 is kind of a torque monster, but slow to rev up.And your pistons won't work with the 350 crank and 5.7 rods.There are people here that are up on all this SBC stuff, maybe there are more ideas to choose from.MPĪfter thought. What stroke are you using? You didn't mention a crank, 400? I hope so, because those pistons are for a 400 stroke.There are several combinations of 350/400 parts to wind up with the 383 type engine, but, I would perfer the 350 stroke and 400 bore, quicker grabbing the Rs, and higher winding. Could you machine a 11cc dish out and still have enough thickness. The piston thickness is about the actual thickness of the material in the top. I assume the steam holes are to match the 350 heads to the 400 block?.Something I'm not familure with, but I seem to recall something about it. 020 in the hole is figured with the comp distance and the rod length. This is if my block has been decked? I know for sure this block is virgin and has never been machined except from the factory. I can use money saved on the tunnel and cam. I suppose I can really save a ton of cash by using these and hogging them out myself. ![]() Will I still need to drill steamholes if I use these heads? I do have some 76cc heads from a 350 with 1.94 valves. You are wanting me to measure from the top or center of the pin to the flat surface of the piston? My main goal is to use the pistons I have but get the compression down enough to use pump gas. Any advice from you guys would be aprreciated. Sorry this is turning out so wordy but I'm trying to lay all the info out on my first post. I was at least thinking of selling the heads to get at least halfway to buy some Dart heads or some good flowing heads with big chambers. The heads I presently have are camel humps ported heavily with fresh 2.02 valve job. I was thinking about having a machine shop flycut a good portion of the dome off to lower the compression. I want to pull that ZZ4 out to put in the 400 with big cam and tunnel ram, but I need to run this thing on pump gas. I originally bought these pistons for my S-10 drag truck but I sold that truck to buy my ZZ4 350 powered Hawaiian jet. They are listed in the older JEGS magazines but not the new ones. Here's the problem, they are 12.5:1 compression I believe with a 72cc head from what I last read up on them. They are new, just a few scratches where they dug out the keepers in the sides. They were assembled on an engine but never ran. ![]() I really want to build this motor since I bought these pistons from EBAY for $250.00. I already have good 5.7rods and a 400 block that is standard bore but needs to be cleaned up. They are SBC TRW forged pistons that are for 400 chevy and 5.7 rods. I'm getting a headache trying to make a decision on what to do with these pistons I have.
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