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Here's what I think may be an interesting side note, the chebby guys have been tossing this link around quite a bit while I've been lurking for info for my suburban. One of the Chevy magazines felt they could out-think the genuine engineers, so they built a 350 (5.7L for euro-listees) engine with different bore and stroke dimensions than Chevrolet used for the production engines. Here's the link. http://www.martelbros.com/afr/Articles/A3-P1.htm It was interesting to me, because they run what I think is insane compression for the street - 11.0:1, but apparently, because the bore is very large compared to the stroke, this thing will burn anything short of tap water without detonation. I also happen to have a 400 CI engine laying around the house, not doing anything... ;-) I'm learning more about this relationship working with the suburban, though not any "real" quantitative data - I have an Uncle in Texas who is running a de-stroked 454 CI engine in his hot-rod pickup because it will rev higher and has huge bores, kind of like a huge version of the 350 in the article. Of course, this is the same uncle who had a 700+ HP supercharged engine in the truck the first time I saw it, and was getting rid of his 18 inch wide tires to get 21 inch wide tires for less wheel spin... Darksiders, say Hmmmmmm.... Jake Kooser > I know we try not to go too big on our engines because of cooling. Has > anyone just stroked a engine and left the bore alone? Longer stroke > usually means more torque. This would up the size of the engine but > would this create less heat than a bore size increase? I doubt if this would make for any less heat increase than a bore increase. The bore increase brings with it increased cylinder circumference which might well cool better than keeping the stock bore. - ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org