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08-14-2013, 08:11 AM
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#28 |
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Re: 1973 Pontiac Firebird Formula 455-SD
The 1973 SD-455 engines had the 'monster' cast-iron header-type
exhaust manifolds. Big 1.625" Round-Port ]primary' openings and 2.50" collector outlet. And nice-flowing 2.50" Exhaust Pipes They really didn't need Headers for Street-Use. 
Last edited by Paul Ceasrine; 08-14-2013 at 09:36 AM. |
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