I think you're rightrevhead347 said:Some of you are a little confused.
That does not make any sense.A 347 won't make any more power than a 302.
The "problem" with a 347 is that it is starting with a 302 block, and you're running out of cylinder wall.A 347 doesn't put stress on the cylinder walls. The rod length/stroke ratio isn't that bad. Chevy small block 400 has a wosre rod length/stroke ratio, and that motor will go as far as any other Chevy motor.
Heads & cam definitely play a role, but the bottom end is usually the limiting factor in turning RPM.The guy who built my 347 is shifting his 347 at 8500 rpms. Where it tops out has nothing to do with cylinder loading. It depends on what set of heads and cam you are running.
I'm pretty sure they're both factory blocks, and quality is similar. Used blocks have other advantages that have nothing to do with quality.Put a 347 kit in used 5.0 block. Don't buy a new block, because the quality isn't as good as a factory block.
Joes95GT said:The differences in Rod angularity between a 331 and 347, both with a 5.400 rod, is less than one when the calculations are done. Rod angularity, I believe, contributes to piston side-loading, which in turn contributes to stress on cylinder walls. Both are moot.
Joe
Yes, I've heard the same.revhead347 said:I swear that the blocks Ford sells to the aftermarket are rejects that they aren't willing to put in cars and warranty. I have heard some horror stories about new Ford blocks. I would just use an old one, there are plenty of them out there.
A 347 not only is a 0.030 overbore, it's another 0.400" of stroke, which is huge.A 347 is a .030 overbore 302, which is nothing. The cylinders still aren't thin enough to make a difference. If it really bothers you, you can always build a 342, which has no overbore.
If you use the same parts from the 302 onto the 347 yes. If not, then no.The power output of the engine is completely dependent on the flow capacity of the heads and cam. Once the flow capacity has been obtained, you are at max power. The 302 will reach the flow capacity of the combination, but you will have to spin it higher to get there. There are a few factors that might cause a 347 to make a hair more power, but the difference is negligible.
What are you going to stroke to get a 306?306stroker said:build a 306 stroker!
HairyCanary said:What are you going to stroke to get a 306?
Bigger is better, if you have the heads, manifold, and cam to support to it.
Some of you are a little confused. A 347 won't make any more power than a 302. It will just produce the same power at a lower rpm.
The guy who built my 347 is shifting his 347 at 8500 rpms
Grn92LX said:Go with the place I suggested for a shortblock. Cheaper and built better.
I dont think the combo I suggested would be as bad on gas as you'd think. But anyway, forged crank in a stock block is a waste of money and can hurt power. Its heavier. A cast crank from the brands I suggested is good till 600hp.
xyoung347x had a nice streetable combo with awesome low end tq. I would prefer more hp though, but sounds like his combo is what your looking for. I'd use the afr 185's, rpm 2 with ported inlet for a 75mm TB and an ed curtis cam then or a jay allen cam. THis will make 380-390rwhp. Not enough for me for a 347 but should be good for you. Fwiw, my friends bolt on 03 cobra runs mid 11's @ 121. Wanna play, you gotta pay
I don't agree with this niether.A 347 won't make any more power than a 302.
a 306 stroker is a freshen up 302 bro.build a 306 stroker!
Grn92LX said:His cack n balls
Yup, I agree
Theres so much contradiction here, its like im reading a bible.
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