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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1973 Pontiac Trans Am (SD 455)
The 1973 Pontiac Trans Am is the finest TransAm that Pontiac ever built. The 1973 Trans Am is a Second Generation Firebird (2nd gen is from 1970 to 1981). Of the less than 5,000 that were built, the 455 SD (Super Duty) with a 4-speed manual transmission is one of the rarest birds out there as only 72 were produced. This is the American muscle car dream!





1972 455 Oldsmobile Olds 442 W/ Flowmaster Muffs Idle & REV
My car at idle with 3 inch pipes from front to back,X pipe,Custom bent tail pipes and 40 series flowmasters




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