Posted by L.C.Gray on January 13, 2008 at 18:48:44 from (208.193.186.135):
In Reply to: Re: OT/chevy engine posted by glennster on January 13, 2008 at 18:20:58:
Huh? 135 degree?
The 348 & 409's (W engine) were still 90 degree motors. The only way I can figure any one mistaking it to be anything other than 90 degree is that the cylinder decks were milled off at at an odd angle. The surface of the heads were basically flat and the large open combustion chamber was formed by the wedge left at the top of the cylinder. The bores and crank throws were still 90 degrees apart.
Check out this months Car Craft and theres a big story in there about building a vintage 409 into a 500hp 481 stroker by boring .060 and triming the main journals on a 454 crankshaft to fit in the old the W block. Kind of a waste really, I'm sure they could have bought an equally potent more reliable 502 crate engine for less simoleans.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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