New engine....spark knock, heat, and heads......
I finally got my rebuilt 350 in my truck, after over a year of piecing together the engine. It is a '76 .060 over 4-bolt main w/ federal mogul 17cc dish hypertectic pistons (HP423 I think), reconditioned rods, .010 under crank (ballanced), 252 High Energy bumpstick from comp cams, double roller timing set, stock oil pump, Brand new Vortec heads, performer intake, Edelbrock 1406 performer carb (600 cfm), stock non-computer controled HEI distribuitor, 8.8mm plug wires, manifolds w/2" duels, and bosh platnium plugs (suposed to fit a '98 1500 350).
My first problem was heat, the temp gauge would keep rising and falling like the thermostat was bad. I replaced the thermostat but no change. Finially it would take off heating up real fast so i would shut it off. After a few seconds or a minuite or so I could run it again for a while. It runs a constant 160 without a thermostat at all. A mechanic friend said it sounded like the lower radiator hose is collapsing to him. I havent checked it yet.
I also have a bad spark knock problem. I have the timing advanced so much it is real slow cranking over, im running 93 octane and i still hear knocking and pinging under a load. The carb seems to be running a little rich ( can smell strong exhaust if behind the truck and if you step on the gas at idle black puffs out). I havent ever messed with the carb out of the box.
And finially, just for discussion, how do you all think vortecs stack up against 882 heads, The ports on the 882's on the old 350 looked a good bit bigger then the vortecs, i have heard a lot of noise made about the vortecs though. Thanks for any help.
Good Guys Wear Bow-Ties