CLASS RACER FORUM - View Single Post - 1973 Pontiac Firebird Formula 455-SD

Paul Ceasrine · 08-14-2013, 08:11 AM

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.

08-14-2013, 08:11 AM	#37
Paul Ceasrine VIP Member Join Date: Apr 2009 Posts: 2,546 Likes: 0 Liked 10 Times in 10 Posts	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.