Wit the post above about the 351 and 500hp 393 i will tell you the few extra cubes isnt fully the reason for 500hp. Its the heads. I believe ford actually used the same E7 heads on the 302 and the 351.
By the mid 70s and up until the Lightning, they pretty much used junk heads on the 351s. However, the '69-70 Windsor heads were pretty decent, and the later GT40/GT40P iron heads were actually modeled after them. Granted they're no 500hp head...just worlds better than E7's.
I've seen that happen 100 times. Guys go to the junkyard and yank a 351 out of an Econoline van and put it in a Mustang with no other mods to the engine except maybe a carb and intake with a carb that is way too big, and it runs like total crap.
I'm not 100% on the numbers but i believe the GT40 heads that came on the Lightning 351 had larger chambers...i think if you were to take a 351 and put on P heads off of an Explorer you'd probably get around 10:1 CR, and even though the heads wouldn't really flow enough to make big power numbers, it would still be a healthy torque engine. I'm pretty sure the Lightings were rated at 240hp/340tq, and with a nice cam and better intake they'd be a real fun engine in a Mustang.
A good bottom end will cost as much if not more than the top....Figure out how much power you want to make. Under 500hp you don't need to go crazy on a bullet proof block and Rotating assembly. Money saved on using a stock bottom end could be spent on 8-10psi forced induction. and you will still have a pretty reliable daily driver that doesn't have to rev. to the moon which makes a more fun street car.
But in the future if you wanted that forced induction 700+ hp car you may regret using a stock bottom.
Bottom line is get a HP number you want to make and build accordingly. A decent rotating assembly will cost $1000+ plus machining. If you want an aftermarket block then its even more. But like i said its not necessary if you only want to make 500hp. A stock 351 with decent heads and a blower will make a streetable 500hp car.
Someone tell me the price difference between a 408 stroker kit and a 393 stroker kit please? My comments weren't based off of any imaginary budget...my car is primered dude..i'm not spending imaginary money. In fact my comments were based on getting the most out of your money, quite the opposite.
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