Originally Posted by tcarda
Originally Posted by OneBadGMC
Originally Posted by whitey70ss
THANKS ONE BAD i FIGURED IT OUT. 113CC CHAMBER HEADS CAME IN A 73 -79 PASSENGER CAR 270 WHOPPIN HP !! i'M GUESSIN THIS WOULDNT BE A GOOD CANDIDATE FOR A DRAG CAR?? :lol: BUT ON A SERIUOS NOTE WITH A CAM UPGRADE AND SINGLE PLANE INTAKE AND GOOD CARB AND HEADERS WHAT IS THIS ENGINE CAPABLE OF ??
Absolute worst heads Chevy ever made for the BBC. Those are the emissions smog heads, better known as "peanut ports".
You will also have a terrible time finding pistons for them that will work. They are neither a closed chamber head nor open. A true open chamber is 119CC.
Take them down to your local scrap yard and donate them, or use them in a tow truck.
They won't make HP, but they will make torque. Good for towing, not hot rodding.
The 14092360 casting is known as the "peanut port" head and are good for a peanut port. The 781 and 049 head have the large oval ports and can be made to make some decent power.
www.mortec.com is a good place to look for casting numbers.
Neither 781 nor 049 heads came with a 113CC chamber. They were both 119CC (in reality they varied between 118 and 122). I have a set of 049s sitting in the basement now.
So I guess the thing to check would be the chamber. If it's a true 781, it won't be a 113CC.
If it's a semi-open, like I said before, it'll be a pain in the arse to get a good piston for it.
Even if it's a 781/049, in order to make it breathe, the valves will have to be upgraded to 2.19/1.88s, which means new seats.
By the time you get done messing with rebuilding them and doing needed upgrades, it would have been just as easy to buy a low end set of aluminum heads.
And yes, you can make good power. I ran 13 flats with a 462 in a 3700 lb truck with them with a 9.5:1 motor (about 435 HP). Same motor with a B&M Powercharger 250 (4-71) with 7 PSI went 11.30s on pump gas in 1994 (about 660 HP).
Same motor with an alky dominator on top ran 10.50s just with a carb/fuel change (about 820 HP)
http://www.youtube.com/watch?v=QsCQbYpzQPM
http://www.youtube.com/watch?v=LW-9NV0VDMQ