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Olds FAQ -- Heads - ClassicOldsmobile. com All Olds big block heads have the same mounting holes, port sizes, etc , and thus are interchangeable Even the combustion chambers are equal at 80cc, plus or minus a little Olds achieved different compression ratios by using pistons with different size dishes in the top Some W-30 heads were rumored to have been factory-milled for a smaller
Olds FAQ -- Engines - ClassicOldsmobile. com The Olds 455 was a 1968 introduction, developed from the Olds 425 introduced in 1965, which was a tall-deck version of the 330 engine design introduced the previous year, both of which replaced the 394ci V-8, which was a development of the design introduced as the 1949 303ci "Rocket" V-8
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)
Summary of Olds 425 455 Engines - ClassicOldsmobile. com Summary of Olds 425 455 Engines You wish: 0- Exotic heads: D, F, H, or maybe K Block? Crank? If the price is right, who cares!? Best of the best: Toro 442 engine 1968-69 Big valve C heads 4V carb High compression Toro engine has oil pan with extra capacity, built-in crank scraper, factory windage trays
442 - ClassicOldsmobile. com 70-Olds-442-convt on Dec 18, 2010 Apr 22, 2025 02:56 PM by 19684424speedconvertible 47 25,986