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Olds FAQ -- Engines Olds simply raised the deck height on their small block casting about an inch to accommodate the 4 25" stroke of the big block 455 The above is a simplification, but the bottom line is that virtually nothing is interchangeable among the engines of the different GM divisions, without a lot of machine work
Olds FAQ -- Intake Manifolds It was a regular Olds 350, with a different PFI intake and distributor They were very often converted to carbs because the system did not run well at times, and was also known for catching on fire, due to some questionable rubber hose used for the pressurized fuel line For anyone with one of these cars, convert to today's FI hose!
Olds FAQ -- Heads Olds engines used 7 16" head bolts up 'til 1976, after that they used 1 2" head bolts The 7 16" head bolts took 85 ft lbs of torque, and the 1 2" bolts took 130 ft lbs [ Thanks to Jim Chermack, Bob Barry for this information PMD Head Castings Pontiac Motor Division (PMD) was commissioned, for lack of a better term, to produce Olds heads
Olds FAQ -- 455 CID Engine Detail - ClassicOldsmobile. com According to my trusty Olds engine book, the 455 was available in 310 hp, 320 hp, 365 hp, 370 hp, 390 hp, all street engines, with full manufacturers warranties The 455 is a very forgiving and long-lasting engine To eek out more HP you can go with higher compression, which will prevent pump gas usage (highest stock 455 comp was 10 5:1)
Olds FAQ -- 350 CID Engine Detail - ClassicOldsmobile. com The 350 was built from 1968 through 1980, produced from 160hp to 320hp, and was installed in just about every car Olds built in that period at one time or another, including the Cutlass 442, Delta 88's, 98's and Toronados, and the Omega
Olds FAQ -- Blocks Olds didn't cast the displacement into the side of the blocks until they went to the light weight design in 1977 The 1977 and newer blocks will have the cubic inches cast in large raised numbers right above the right hand center freeze plug, eg 403 The 307 will be in liters (5L), and a diesel engine will have the letters "DX" on it
Olds FAQ -- 303 CID Engine Detail - ClassicOldsmobile. com Olds did go to 12 volt electrics in 1953, so that would likely be the biggest problem area in swapping these engines Car equipped with the 303 and power steering used different intake manifolds than non power steering cars These first engines also had interchangeable left and right exhaust manifolds