Quote:
Originally Posted by vertigto
Lee...seems there may be more than 10hp to gain (hard to see your graphs on my pc)?
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Click on the pictures, and they will enlarge.
Summary 1st graph: Log manifolds caused HP to go flat by 3800RPM. By around 4300rpm the log HP was staring to drop. Peak-to-peak, the headers made 45rwhp more than the logs. By 4500, the HP difference was closer to 50rwhp.
Summary 2nd graph: Mild 400 with 260+cfm heads and a mild HR cam, but with 2.5" R/A exhaust manifolds, shows HP steadily gaining as the curve approaches 5000rpm. With 312rwhp, this 400 is approaching 400 flywheel HP, and is doing it with only 8.3:1 compression and 87 octane. Also note this engine was tested nearly 7 years ago, and is still running great.
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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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