The 6X heads flowed intake/exhaust: .100/88/85, .200/153/122, .300/206/164, .400221/185, .500/232/196. The KRE heads flowed: .100/92/71, .200/166/129, .300/234/169, .400/256/201, .500/261/220.
Average HP/TQ iron heads: 490.7/422.1
Average HP/TQ KRE heads: 525.3/452.5.
Peak HP/TQ iron heads: 5300/3900rpm
Peak HP/TQ KRE heads: 5600/3600rpm
Don't be misled by where the peak tq occurred at with either combo, the numbers start out right at peak at 3500rpm and stay steady or flat till 4300rpm, still making over 500 ft lbs with the KRE heads to 5100rpm and to 4700rpm with the iron heads.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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