243 or 821 or 823 for forged 6.0
#1
TECH Fanatic
Thread Starter
243 or 821 or 823 for forged 6.0
What would be the best head for a forged 6.0 it has summit pro ls pistons and rod in there flat tops, building nitrous engine!3-400 shot
#4
TECH Fanatic
799/243 are the same castings as a corvette head with diffrent valves and such. I'd run the 243's, but the others aren't bad either.
#5
Launching!
iTrader: (18)
I think a good rule of thumb and has been most likely documented someone in the www is that replacing a cathedral with a square port even with a drop in compression gains about 30hp, not sure it's 30whp. However I think that is more towards peak and not so sure what the entire curve looks like. Could always mill the square ports to gain some additional compression.
#6
Both 821s and 823s are square port. Only differences are the 823s chambers are 2cc smaller and hollow stem valves.
#7
TECH Fanatic
If it's in a truck wouldn't the low rpm torque from the 243's help get it up and moving versus the square port higher rpm torque?
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#8
100% Redneck
OP didn't post if the truck is going to live on the street. If it's a strip only truck a big stall will cover that low end handicap. A 300 to 400 shot is gonna have to be progressively controlled. Should pull like a freight train with either square or cathedral ports.
#9
TECH Fanatic
Thread Starter
It’s daily for now till I get my wife car fixed, she driving my 16 Silverado right now, it will be street track only soon! It need a new converter right now I think the 5.3 with 200-250 over power it, it falling on it face right before the 1/8th! My cousin saying to run 821/823 on it it would help little on the spinning she does but gain more on top.? Cam I not set on yet tell I figure out the heads first nitrous will be on progressive 2 stages, just want low low 6’s to keep up at east coast truck wars