3.25 stroke- 4.155 bore

[2xmod]

I have some stuff layin around I want to use up. I have a set of 6" rod 406 pistons,a 400 block and a 327 crank. To make this work, Id have to use a set of 6.250 long rods. Does anyone see a drawback in such a long rod short stroke combination like this? Eagle has the 6.260 long SIR rod for like $250. Lookin to use it for a IMCA mod application not more then 500 hp. Would this combo really need some special ground cam? Thanx Brad

[trmnatr]

I have some stuff layin around I want to use up. I have a set of 6" rod 406 pistons,a 400 block and a 327 crank. To make this work, Id have to use a set of 6.250 long rods. Does anyone see a drawback in such a long rod short stroke combination like this? Eagle has the 6.260 long SIR rod for like $250. Lookin to use it for a IMCA mod application not more then 500 hp. Would this combo really need some special ground cam? Thanx Brad

Keith Black has a flat top piston for use with a 6" rod

I know a guy who ran 7.20's with this combo in a 2400 pound race weight chasis. Twin dominators, sheet metal intake

What would be best is to get a block with 283/327 mains or 350 mains and get a crank with 350 mains or 283/327 mains

One time i saw a Bryant 3.26" stroke crank on Racingjunk for $550, it had 283 mains and Honda rod journals

[CamKing]

If you've got a really hard tire, and have trouble hooking it up, this would be a good combo for you.


PS, yes you'll need a custom cam.

[revolutionary]

My friend has a similar combo (but using an old 307 crank). Stock Canfield heads and a 242/246 solid roller it made a tick over 500hp and spins happily to 7200 all day.

[new engine builder]

I have some stuff layin around I want to use up. I have a set of 6" rod 406 pistons,a 400 block and a 327 crank. To make this work, Id have to use a set of 6.250 long rods. Does anyone see a drawback in such a long rod short stroke combination like this? Eagle has the 6.260 long SIR rod for like $250. Lookin to use it for a IMCA mod application not more then 500 hp. Would this combo really need some special ground cam? Thanx Brad

I would think on a dry slick track this would be great.
On a tacky track you would really have to put a gear in it to make it work well.

[ZIGGY]

What new said, and depending on the car weight, gear, and track
it may be a dog in traffic IMO.

[(old)carnut]

This is almost the same as the build that i am doing 4.155 x 3.335. It is what i have so i am going to use it and see what i can get out of it. Keep us posted with the results as will i.

[KRYPTINITE RACE ENGINES]

We have a few with a similar combo,4.165x3.260 and a 6.200 rod,400 lightened block and filled to the bottom of the freeze plugs.Run them in 1500 lb sprint car,8200-8500 rpm injected on methanol with no problems.

[PackardV8]

This 4.125"x3.25" has been the hot setup for dirt guys limited to 360" In fact, recent requests from some dirt track guys have us digging through our crank pile. We turned up a couple of large-journal 3.25" 327" forged cranks which are now being cleaned and turned. What are you guys paying for a good stock crank ready to run?

thnx, jack vines

[(old)carnut]

I picked up my LA billet crank for $400. 3.335 stroke. I know some people dont like ebay but if you shop around and do your research you can get some really good deals

Check out ebay item number> 220289673049 and 220289699121

[2xmod]

Theres also guys putting a 400 crank in a 307 block to make the 360 rule around here. I dont know the bore of a 307 offhand to figure out the cubes that comes out to.

[2xmod]

Does anone make an aftermarket cast 3.250 stroke crank.(chevy) I found some forged ones.....But I thought scat or eagle would make a cast one. I cant seem to find one.

[MR. 327]

The stock bore of a 307 is 3.875 so at .030 over you'd have a 3.905 bore . and 3.905 x 3.750 = 359.29