My 455 also has the 66's. Unfortunately for me, mine came with the cheap cast pistons that have the bevel around the edge of the piston, lowering the CR even more. My final CR is less than 8.0:1.
But with a set of Tri-Y headers, a really good exhaust system, and a custom low-lift HFT cam, it runs pretty decent. With a stock torque converter and a 3.08 posi, it will smoke the tires off-idle, even at just part -throttle. The motor is DONE by 4800rpm, but it has killer torque and runs great on the cheapest gas I can find.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
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