Can Oldsmobile 455 heads bolt onto an Oldsmobile 350 block?

Answer 1

n. I/We did it in Orlando out of Performance Clinic where the "Turbo Doctor was out of with his Reagal's. Tim was the Aspirated guy. Just get different piston's(higher compression one's). Do the c.c equation's when you do. A smig'of machine work block-mostly heads to intake(watch push-rod gally holes/area. Get controlled Lifter's(Roller's y comp) and your in like flin. Read on...

Quote:

Originally Posted by Pghstarsky Will 455 heads fit directly onto a 350 block? I dont think they will but I overheard someone talking about how it would work. Thanks Yes, all Olds heads are the same size and bolt pattern. 77-up small blocks use 1/2" head boltsvs. 7/16" on 76-older blocks. You can drill early heads for the larger bolts.

As others have noted, big block heads have 80cc chambers vs. 64-ish chambers on 70-earlier SBO heads. The BBO heads also have larger ports that a street-driven 350 will be hard-pressed to use. The Performer RPM and some factory intakes are the only ones with enough meat to port-match to the BBO ports. Failing to do this matching will negate any flow benefits. As others have noted, simply maching the SBO heads for the big block valves is a much cheaper way out (and is what the factory did on the W-31). __________________

Joe Padavano

62 F-85 Deluxe wagon (the NV desert car)

62 F-85 Deluxe wagon (the San Jose car)

64 Vista Cruiser

64 Jetstar 88 Conv

66 442 L-69 Conv

68 W-30

69 H/O

69 442

70 W-30

72 442

84 Custom Cruiser

86 Caprice wagon (w/307 Olds)

Answer 2

n. I/We did it in Orlando out of Performance Clinic where the"Turbo Doctor was out of with his Reagal's. Tim was the Aspiratedguy. Just get different piston's(higher compression one's). Do thec.c equation's when you do. A smig'of machine work block-mostlyheads to intake(watch push-rod gally holes/area. Get controlledLifter's(Roller's y comp) and your in like flin. Read on...Quote:Originally Posted by Pghstarsky Will 455 heads fitdirectly onto a 350 block? I dont think they will but I overheardsomeone talking about how it would work. Thanks Yes, all Olds headsare the same size and bolt pattern. 77-up small blocks use 1/2"head boltsvs. 7/16" on 76-older blocks. You can drill early headsfor the larger bolts.As others have noted, big block heads have 80cc chambers vs. 64-ishchambers on 70-earlier SBO heads. The BBO heads also have largerports that a street-driven 350 will be hard-pressed to use. ThePerformer RPM and some factory intakes are the only ones withenough meat to port-match to the BBO ports. Failing to do thismatching will negate any flow benefits. As others have noted,simply maching the SBO heads for the big block valves is a muchcheaper way out (and is what the factory did on the W-31).__________________Joe Padavano62 F-85 Deluxe wagon (the NV desert car)62 F-85 Deluxe wagon (the San Jose car)64 Vista Cruiser64 Jetstar 88 Conv66 442 L-69 Conv68 W-3069 H/O69 44270 W-3072 44284 Custom Cruiser86 Caprice wagon (w/307 Olds)