[74huggerorange]

I have a 1974 Chevy truck with a 4-bolt 350, this engine is supposed to have flat top pistons but I've never checked. It has the 76cc heads, crane cam 272 energizer, edelbrock performer eps, 2 inch carb spacer, edelbrock performer 600, 14X6 k&n, flowtech afterburner headers 2.5 inch dual exhaust with dynomax bullet race mufflers, no ac, flex fan, crane cams valve springs, longslot 1.52 ratio rocker arms, th-350c with 6 cylinder torque converter, richmond 4.11 gears with 33 inch tires and soon to be lock-right locker. My valve guides are worn and causing the truck to smoke and I just need to know what heads would be good to replace mine with. I don't have money for expensive aluminum heads and vortecs require a different intake so their also out of the running. I thought about having 2.02 intake and 1.60 exhaust valves put in my heads along with a mill to 64cc, but I've been told that these heads are worthless. If you need any other details let me know. What should I do? Thanks

[74huggerorange]

Oh yeah I also have a msd blaster 2 coil, petrronix breakerless ignition, performance cap and rotor, 8mm super stock wires, and bosch platinum spark plugs. Thanks

[Skylark_77_455]

My dad has a pair of World products Sportsman II cast iron heads that work great. They fairly reasonably priced at I think less than a grand. I can't remember the valve sizes but they may be 2.02, 1.60.

[johnsongrass1]

You forgot to tell us what heads you have. Give us the casting numbers and we would be glade to give our $.02

[74huggerorange]

They are supposed to be the crappy smog low compression heads. By the way what do you think of this combo? I have some of the power pack heads from a stock 283. They have 58cc combustion chamber but would definately need bigger valves. Would those work?

[nickel333]

check out a world products, iron eagle, pro action, 200cc heads may be a little big for your combo so go with some 180cc heads and you could probably tame the rear gears down a little as your not going to need 4.11's with your mild cam intake and carb.

[74huggerorange]

Just ran the #'s on my heads and I was way wrong!
I have 376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber heads. No clue what size valves, but when I bought the motor 10 years ago it was built for high hp in a speedboat and the heads explain why it will only run on 91 octain gas. so now the ? is should I keep these heads and have new valve guides put in and possible bigger valves with minor porting work? Or are these heads very poor flowing and a waste of time. Right now the truck runs like a striped ape, it just smokes a little. I also need to know a way to check and see if the smoking is heads or rings or both. It doesn't smoke any when first started or cold, it has to warm up then starts slightly smoking. Thanks