4.5" stroke in a 460 block .030 overbored (545ci).

The question is should i stick with a forged heavy crank or go lightweight, or super lightweight?

 

Depends on your budget and the use. For serious drag racing where real money is involved, spend the big bux get the lightweight version.

Otherwise, stick with a good forged crank and press on.

 

im not worried about a couple hundred dollar difference, just looking for what would be better performance wise. lighter is better obviously because its not as heavy, but with such a high hp engine wouldn't the forged crank keep up momentum a little better?

 

That 460 has 3" main journals and you could use a cast piece for all that matters. My tuner has one with a cast cracnk that makes 1100 on the bottle.

I have a 460 block I am building too. My thought is more with longevity versus horsepower. I would get the strongest crank available if I were replacing it. If the lightweight version was just as strong, I would get that one.

 

what is the main purpose of the car?
the cast crank is plenty strong, but personally i would go with the forged crank IMHO. it might be heavier, but it will last longer and all that happy horse crap. if it's a high revving engine i would go lightweight everything, but if F/I get the forged more security is good for peace of mind.

 

I'd go with lightweight forged. A stroke that long with rods/crank that heavy, weight will have a significant impact on how the vehicle performs. It won't produce any more measured power, but the engine will accelerate faster with lighter parts.

 

lol lightweight and forged= more than a fw 100 more dollars. And given those two options i will take a forged piece anyday, since MOST strokers won't see anything past 6200RPM

 

Light weight with allum. rods. Will spin to the moon

 

If your going to spin it don't waste your time with more cubes go with a 429 and rev it to 8k

 

I know a lightweight forged setup is expensive. But the weight isn't just important for high rpm. It takes power to accelerate mass because of rotating inertia. The lighter the mass of the rotating assembly, the faster the rpms will come up, IE the faster the car will accelerate. Whether you turn 5,500rpm or 10,500rpm, a lighter assembly will let the engine rev up faster. Less power consumed to accelerate engine parts = more power available to accelerate the car.