Bob Gerometta Posted August 8, 2023 Share Posted August 8, 2023 Factoid – 1963 Pontiac Gets Street version of the 421 CID V-8. Called the “HO 421”! This 370 HP was a tamed version of the race engine. SEE a Road Test of a Grand Prix 370 HP version HERE https://over-drive-magazine.com/wp-content/uploads/2022/09/1963-03-MT-Pontiac-421-HO-1-5.pdf Specs: Bore and stroke: 4.09375 x 4.00″. Compression ratio: 10.75:1. Horsepower: 353 @ 5000 RPM. Torque: 455 @ 3400 RPM. Five main bearings. Hydraulic valve lifters. Camshaft Duration: Intake 292°, Exhaust 302°, Overlap 65°, Lift 0.400″. Carburetors: three 2-barrel Rochester carburetors: (front) 7013078 (center Synchromesh) 7023161 (center Hydra-Matic) 7023162, (rear) 7013079. SEE the AMA Spec Sheet for the 421 HERE https://over-drive-magazine.com/wp-content/uploads/2022/09/1963-Pontiac-AMA-1-33.jpg.pdf See much more - it's FREE! At https://over-drive-magazine.com/ Link to comment Share on other sites More sharing options...
Pfeil Posted August 9, 2023 Share Posted August 9, 2023 Painful to look at those cornering shots in the pictures. If only Pontiac had employed negative roll steering. 1 Link to comment Share on other sites More sharing options...
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