1973 Pontiac Firebird 455 Exhaust

1973 Pontiac Firebird 455 with 2.5 inch Exhaust and flowmasters!

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Pontiac 455 duet
The LeMans (on the left) has a mild, non-rebuilt 455 with ported & polished 6X heads, c. 9:1 compression, Edelbrock Performer intake, Holley 800 Street Avenger, Comp XE274 cam, making maybe 300-350 horsepower. The Grand Am (right) has a .030 over 455 with Edelbrock heads (87 cc chambers), 10:1 compression, same Comp cam but with 1:65 roller rockers, slightly better Exhaust (H-pipe), Edelbrock Performer RPM intake and Edelbrock 750 carb. About 500 horsepower at the flywheel. The heads make all the difference. The Grand Am has the Flowmaster American Thunder Exhaust system, which has the 50-series mufflers. LeMans has a Summit Exhaust system, which was cheap and went on nice & easy.





Derricks 72 455 firebird
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Lightning McQueen found! here is his father first. An Pontiac Firebird from 1973
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1973 FIREBIRD
400 BLOCK ENGINE STICK SHIFT KIT




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