4.5"Stroke crank in stock 454 block
 

Doing a little thinking (which can lead to trouble), is it possible to put a 4.5" crank in a stock 454 block? Is it worth the trouble? If possible, how much work will it take? Thanks for any input.

Nope. 4.25 is about it. Go .060 over with a 4.25 stroke for 496.

:shock: How much time you got on your hands and are you good with a grinder? What cubic inch are you after. If you're going big which it sounds i would start with a Dart block.JMO

and don't forget the stroker oil pan, good luck 8)

Thanks, didn't really have . plans set in stone. Looking to the future and thought I'd see how far a stock block could be pushed. I was kinda hoping it would work, would be cool to have a stock looking motor with much bigger cubes than appears

you can build it to a 496 but have a $hit load of compresion to raise
the hspwr and throw in a huge cam, and with the 4.25 crank, a
13 to 1 comp and that bbc would rock, or you can go the way
beast said the dart block come ready notched for the 4.5 crank
and can be bored wider than 4.310, i think it can go to 4.5 not sure
but good luck and have fun when your building it make sure you
make hotrod sounds when your fitting your crank and pistons,
like " Rawwwww Rawwwwww" and when someone ask, you tel
them thats what its going to sound like, ha :D :wink:

If I make those sounds, is that gonna give me a few more horses? Or do I have to stop working and pretend to shift too.

This got me thinking to. The 4.250 crank will work in the stock BBC but can you put sleeves in and bore it to 4.500 or 4.600? Is it possible to build a 540ci(4.250 crank/4.500 bore) or 565ci.(4.250 crank/4.600 bore) engine with a stock block?
Ya I know it'll probably cost more than a Dart block but lets not think about the money side of it for now.

humm, food for thought, nofear,

my machinest told me that .30 over max without a sleeve, .60 max
with a sleeve anything over even with a sleeve not recommended,
and you have to fill the block, i went 4.310 and if i wanted bigger
i would purchase the merlin or dart, you have more work involved
with rod/crank clearance for the 4.5 stroke on the standard 454, the
other after mkt blocks....come ready :wink: 8)
and the car goes.."rawwwwwww rawwwwwwww" :D

You can take a stock block more than .030. I've had two that were .100 over with no problems. You can go as much as .125 over but i would get it sonic tested first. A .100 over with a 4.25 stroke is a 505 a .125 over with a 4.25 stroke is 511. Just some ideas.

you are right, back in the day, that was what we called a big cube motor. :)

I was trying to think outside the box. If a person wanted to use the stock block,and money and time invested in clearancing weren't an issue, what kind of crazy sh#t could a person accomplish. How about a 4.375" I've always heard only 4.250" also, but I wanted to see if anyone has pushed the envelope.

talking about stock appearance Big Cube engines...how about a small block appearance with close to 500ci........

Now if ya got the money and ya wanting to play some mind games..go this route...i will argue with you all day long is a 355ci.... 8)


i ran a .125 454 block with 4.25 stroke..ran like a scalded dog..it was not hardblocked and i had zero Problems..i broke a lifter to end this engines life.

i personally would keep it at .100 over with a 4.25 stroke

I personally donot like sleeves in a steel block, either sm/blk or b/blk, they almost always have a head gasket sealing problem. I would rather change blocks than to sleeve one.

JMO

Zip.

I have a 4.5 stroke in a stock GM block. Made 900 hp on alcohol. There is some grinding invovled but then again your saving 2500.00. I personally think the purchase of a Dart block is money well spent. If you do decide to go with a stock GM block use a tall deck. That way you can use a longer rod. 4.5 stroke 4.375 bore is a 540. My block has no sleeves. I did fill the block with cement though. Ill probably go to a Dart block next year and 4.625 bore. One other small gain to a GM block is I think there about 100lb lighter than a Dart block.

4.5 crank
 

Yes you can fit a 4.5 stroke in a stock 454 block . I have done it wit an eagle crank , eaggle h-beam rods and cutom J&E pistons . It was not easy . I had to machine to O.D. of the counter weights off the crankshaft which required a lot of extra work on the balancer and plenty of heavy metal . The pistons have a 1.145 compression height . The end result was a 518 cubic inch BBC for a motorhome . Massive torque output . i am now putting that same engine on an airboat .

Just my experience, but I have a 496 (4.310 bore x 4.250 stroke) with aluminum rods and a 511 bbc (4.375 bore x 4.250 stroke) so far no problems with either combo.