march on firebird 400

[Gunstar1]

My limited understanding of the 455SD is such:

Redline was 6000 RPM (as opposed to 5200-5500 for other PMD V8's)

Compression in 73 and 74 was 8.4:1

The heads were basically modified RA IV.

Crank, rods, pistons were all forged.

4 bolt mains (only SD and HO PMD V8's had 4 bolt mains)

Bottom end of the engine could handle up to 600 HP without modification.

Exhaust manifolds were the PMD HO manifolds. They flow as good as headers, without rotting out.

Flow tests (as reported in an old edition of High Performance Pontiac) actually flowed better than Dodge's Hemi heads.

1973 was rated at 310 HP, and 74 was rated at 295 HP.

Fastest production car in the US in 73 and 74. Easily capable of 13's stock, stick or auto.
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This is all from memory, so if I'm wrong, please let me know.