SB

Stop buying steak. Eat chicken.

demax990

Lol i would love to ditch the heads anyone have heads they want to sell for a few hundred bucks a half eaten steak and 2 cans of PBR

airjunky

The valve sizes are the same as the 781s ect .guess you could do a quicky chamber cc and grind till the cows come home . Or build a torque monster that would fry the tires right off the back of a 4200lb monte carlo.
Me and a million other people wonder what the world would be like if merc could of got the oval ports for thier base 454s instead of the truck heads .maybe horse trade , search craigslist for a 454 with something else , scrounge the boat shops for a cracked gen6 maybe the heads are good , i have picked up grenaded vortec 454s cleap under 200$ cheap and got buildable heads from them .

dereknkathy

i just bought a done set of vortecs from a kid goes to votech school for 300 bucks. no port work but valve job looks good, head had .002 shaved to clean up face. i have a tired set of vortecs, 1 bad guide, 15 kinda loose guides. was some kind of generator or pump engine ran propane. if i gave you the heads it would cost 100 to 200 to get them to alberta. but if you have a votech school nearby there is a source for valve and head work WAY under market. (sitting in a school parking lot..."hey little boy, wanna play with my head?") try car-part.com. it is a boneyard website. harrys auto wrecking in grand prarie shows a pair. no price listed though...

dereknkathy

ex valves. i did a thread asking when inconels were needed and the consensus is the stock truck valve is stellite which is the next best thing and very similar. boat engines are after all truck engines. heavy load constant rpm for a long time. race car engines run from 3500 to 7500-shift, repeat-shift, repeat. shut down. 12 seconds total full throttle. how many people you gonna impress running your boat engine for 12 seconds? so the peanuts and L29s both have very stout exhaust valves and they are interchangeable.

ezstriper

I would not worry about forged crank and rods for a 500hp engine, put forged pistons in and some decent iron heads..it will be fine...we have raced(with no failures) cast crank, 3/8 rods, 2 bolt main engines that ran great for many many passes...put that $$$ towards heads..and if its a genIV I would look at the large ovals like 781's make a great marine setup, use a performer RPM intake and decent cam Roll on..

apollard

Lingenfelter did get good power out of peanut ports - after he opened up the ports, and put 2.19 / 1.88 valves in them. In other words, he made them close to a good set of large ovals.

Not cheap to do that - you could by Eddy marine heads for that and be at about the same level, but with 90 lbs less on the stern.

I agree with the build the short block to support more power later approach. You'll have to compromise the cam since peanuts won't take much lift, but that is an easy change later.

demax990

Derek thanks for the info. I get all of my stuff shipped to sweetgrass Montana way cheeper

Jonesyfxr

As mentioned, why not grab a pair of 049 or 781 heads?

I know it's no boat engine but we're making 600 hp with a set of bowl ported 781's on a 461 BBC in a Chevelle.

demax990

it is a gen 5 so I don't want to run mark 4 heads. I found a set of vortecs that I might grab for 200.00 and they mag them for cracks. maybe I will do a 330 on roids kind of build also what do you guys think of 10 to 1 comp with the vortecs. gas is cheeper than dirt and I don't burn much. maybe on 94 oct