I have a 99 5.3 that's going in my 02 silverado that currently has a 4.8 and the 5.3 has 862 heads and I found a set of 799 heads on a 5.3 in a savannah van and I was wondering what heads were better with a small cam and 75 hp shot of nitrous
I have a 99 5.3 that's going in my 02 silverado that currently has a 4.8 and the 5.3 has 862 heads and I found a set of 799 heads on a 5.3 in a savannah van and I was wondering what heads were better with a small cam and 75 hp shot of nitrous
799!
If you use the 799s you will gain flow, but lose compression. If you swap the 4.8 pistons into the 5.3 with the 799s and a cam you would have a great combo. Powerful for sure.
ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06
waiting to go in... 3.90s, 214/220cam
You could also mill the heads. It takes .007" milling to remove 1cc from an LS1 head.
If you have a stock 66cc chamber and you want to get down to 63cc chamber,
66-63 = 3 (you'll have to remove 3cc's)
.007 x 3 = .021"
So to get your 66cc chambers down to 63cc you'd have to mill .021"
* 2004 Chevrolet CCSB Z-71 5.3L * G80, 3.73's * Black Bear Autocal 91 oct tune * Magnaflow 3" SI/SO 14" case * Airaid M.I.T. * OEM airbox with open air modification * Color matched grille & lower valence * Blackened Tail Lights * SuperBright LEDs in brake lights & reverse lights *
In the garage to be installed: 799 heads, Dyna-Tech long tube headers, Corvette servo, 2" lowering shackles, 2wd u-bolts & bumpstops
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