1973 PONTIAC LEMANS ON CHASSIS DYNO
HERE ARE A COUPLE OF PULLS ON THE CHASSIS Dyno. IT WAS LATER DISCOVERED THAT WHEN THE CAR JUMPED THE ROLLERS IT BENT THE DRIVESHAFT. JUST ANOTHER PART BROKEN TO ADD TO THE SCRAP PILE.
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.
Restoration Of My 1974 Pontiac Lemans
Restoration Of My 1974 Pontiac Lemans. All work was done by me in a 10x30 storage unit. For the whole story, click here. www.myspace.com/74lemans