347 Stroker/How to make Horsepower?
Other guys have already talked about this same point, but for me the advantage of a stroker is the opportunity to stretch the horsepower (& more importantly the torque) over a broader RPM range.
I love small block Fords, but the one drawback is that the power tends to fall within a fairly narrow RPM range compared to bigger engines, and when you make modifications to increase the horsepower, the power range moves up the RPM scale, and usually comes at the expense of lower RPM torque. It seems like a tug of war and you always seem to lose something for everything you gain.
Strokers offer the opportunity to get the best of both sides by increasing horsepower and torque without (necessarily) having to push the RPM's into difficult streetability ranges. Of course you can build a stroker for whatever power profile you want, but you don't have to sacrifice something for every other gain.
Just start with a solid foundation: a bullit-proof short block. And for my soapbox speech again I'll say don't use a 289 block. People on this forum keep shooting me down on that topic, but when you're going to add stroke to an already tiny block you need every 1/8th or 1/16th or 1/32 or 1/64th of cylinder skirt you can get down there. Turning a 289 into a 347 means going from 2.87 stroke to 3.4 stroke. That's over half an inch and an 18% increase in stroke. Even the 331 is pushing it. Everybody knows that .30 is the maximum recommended overbore for Ford small blocks, but everyone has heard of someone going .60 on them without 'blowing up'. Now guys are doing the same thing with strokers, and when they don't blow up, they think they're doing OK.
I still can't figure out why anyone would put $1000+ into a set of aluminum heads and gamble everything on some local guy's advice by using a 289 block that Ford lists as maximum 3.1 inch stroke while seasoned 5.0 blocks or new Ford Racing blocks are so plentiful and cheap in comparison to all the other stuff bolted onto these engines.
\'67 Mustang fastback w/ 5.0efi & T5z; TCP suspension, steering & frame connectors.
2000 Explorer Sport 4x4