Why?????

I have a couple of questions.... If there is "NO REPLACEMENT FOR DISPLACEMENT", why don't guys start with a 460???... Why does a 460 with the same compression as a 392(stroker) not put out the same horespower??

The way I understand it that while there are many variables that contribute to a stroked small block gaining more power per cube than the respective big block. A part is power to weight,but the biggest factor is air speed through the heads that is gained when one goes for big strokes. The higher the air speed, generally the higher the volumetric effeciency of the motor, and thus more power per cube and at lower revs. You can get volumetric efficiencies of greater than 100% in good examples, this means in real terms is that the air is rushing in so fast that a little bit more is crammed in with the rush. It is no secret that very efficient smaller port volumes gain the most power, read Torque, per cube weight shifted.

Why not start with a 460? They don't fit too well in some engine bays very well.
Also, if your intentions with the car is handling, a lighter motor will allow the car to handle much better than a heavier one.

Handling indeed.. That is the reason I ain't going 500+cubes(yet). I still love haulin' A$$ through the Salt River canyon! That is why I am replacing my 306 with a 408W.
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If there's no replacement for displacement, why would people rather have a blower 302 over a 351 Stroked 427? Granted, a 671 BDS with 6lbs of boost on A 302 = 427CID. It seems to me that getting cubes with just the engine is the way to go. Ok, here's a question. If a Blower equals cubic inches, would NOS also equal cubes?


L8R,

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Theres also the advantage of a better rod ratio using a longer rods on a stroker. Its hard to explain, but I believe since the rod is longer it sort of stays ?straighter? longer after combustion which equates to more power. That was a really bad explanation, mabye someone else could describe it better.
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Uh oh...here we go with the rod-stroke ratio debate again[img]/phpBB/images/smiles/icon_topicsucks.gif[/img]

long rods..lol
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I think the bigger question is how big is your wallet, in order to get the same power out of a 460 you need good heads, but that is the case with any engine. Lets face the music, big ford 460 stock heads suck, with the except of course of a couple of castings numbers. The amount of work required is staggering with completely milling the ex side off the head and reshaping and building a new ex port is beyond what most do it yourselfers can do.

Power to weight ratio and cubic inches rule the world with the new blocks coming out the possiblity of getting 2-3000 horses out of a smaller and lighter engine are hotest talk in town. And with engine compartments getting smaller and not larger the 351W rules the track in more ways then one. While the 351W has some draw backs main journal size and rod sizes being two that come to mind for serious power makers it is still several hundred pounds lighter then a 460.

Dynamite is faster but not recommended so while Nitrous equals cubes, black powder equals smoke. So to round this off, in a consistent fashion there is no equal for power to weight ratio and maxium cubes the more cubes and less your rocket weighs the faster you will go. But remember dynamite is faster..

I'm so full of sh-t sorry guys just talkin-sh-t! No offense intended..

[img]/phpBB/images/smiles/icon_smile.gif[/img]

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On 2003-02-22 19:49, onefastmfgt wrote:
I have a couple of questions.... If there is "NO REPLACEMENT FOR DISPLACEMENT", why don't guys start with a 460???... Why does a 460 with the same compression as a 392(stroker) not put out the same horespower??
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Ever tried putting a 460 into a Falcon, early Mustang, Maverick, Comet, Fairlane, etc? They won't fit. That's why we're stuck with stroker windsors and stroker 302s. That's exactly the reason I'm stuck with a 357w in my Maverick. Nothing larger would fit in there before I did the Mustang II front end. Now, I see no problem getting a 460 based engine to fit, other than oil pan & headers. Even then, a little fab work and we're set. I'm actually considering building up a 460 based engine, though running 6.20's in a 100% steel bodied stock-crank stock-stroke under 7000 RPM 351w is kinda fun.

No reason whatsoever I couldn't save some money and shoot for mid 5's with a big-block stroker. For now, I'm having fun with the small-block!