Wikipedia's got it right (this time!)- '58 336 was a small-bore 370, and '59 336 was a small-bore 389- actually closer to 337 c.i., as Widipedia said. The rest of the engine was pretty much identical to the cars, except for lower compression ratios- I think dished pistons, but haven't actually seen the inside of a 336. Strictly 2-bbl carbs, and I'm guessing a milder cam. Wasn't the '56 engine (cars and GMC) actually 322 c.i.?
My '59 GMC had a 336 from the factory, but it was long gone when I bought the truck. It will go back together with a Tri-Power '58 engine at 382 c.i. My front fender "GMC" emblems were too pitted to use, so I decided it really ought to say "Pontiac V8" anyway!
Over on the "61 & Older" forum, there's quite a lot of discussion of Pontiacs in GMCs.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
Last edited by Jack Gifford; 01-27-2008 at 04:01 AM.
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