350 w/bigger crank?

[XTRMEASURES]

i have a 350 im going to rebuild as a stroker. my question is what cubic inch will it be.


here is what im working with

350 4bolt
4.030 piston
6.000 rods
4.000 crank

[camaro608]

sounds like a 383

[XTRMEASURES]

with a 3.75 crank it would be a 383 but what about a 4.00 crank

thanks

[Ricoch3T]

It works out to around 408cubic inches
We have one in one of are race cars.. its a pretty good running motor.

[Samckitt]

Formula for figuring the cubic inch of a motor:

3.141592654 x ((bore/2)x(bore/2)) x stroke x #cylinders

[Lowend]

4" Crank in a factory block is a massive PITA, I wouldn't do it.
3.875" crank is as big as I like to go in a OE casting
Not to mention that running a 4" crank with a 6" rod is going to put the ring lands way into the piston pin. Forget about turbos, superchargers and Nitrous

[Ricoch3T]

4" Crank in a factory block is a massive PITA, I wouldn't do it.
3.875" crank is as big as I like to go in a OE casting
Not to mention that running a 4" crank with a 6" rod is going to put the ring lands way into the piston pin. Forget about turbos, superchargers and Nitrous

He is right, I guess I should have mentioned that when we did ours it was in a bowtie block, OE castings can be pretty weak

[camaro608]

ok yah i had the wrong crank in my head yah he is right 408

[XTRMEASURES]

thanks guys ive learn something today

[camaro608]

thanks guys ive learn something todayand it wasnt how to spell hahahaha just kidding :seizure:

[XTRMEASURES]

4" Crank in a factory block is a massive PITA, I wouldn't do it.
3.875" crank is as big as I like to go in a OE casting
Not to mention that running a 4" crank with a 6" rod is going to put the ring lands way into the piston pin. Forget about turbos, superchargers and Nitrous

who builds a 3.875'' crank?

[Lowend]

Crower, Lunati, and Scat come to mind right off the bat. With a 4.030 bore it makes a 396cid smallblock

[KsKustoms]

You will have to use a smal base circle cam with that large a stroke. Most of the time it's not worth trying to get that extra bit out of it. Pistons become too much of an issue. If you want more cubes start with a 400 or Dart Block, it's much safer and easier.

[KsKustoms]

Also SCAT would be your most cost effective manufacturer. For Crower, Callies, or Lunati you would be looking at 2-4k

[XTRMEASURES]

you guys are the best
i will call around and see what i can get. i might just build a 383 and call it a day.

[XTRMEASURES]

ok this is what its looking like,

stock 350 4bolt machine to fit 3.75'' crank
5.7'' or 6'' rods ( whats the big deal about longer rods?)
3.75'' crank
flat top piston
vortec heads w/2.02 intake
RPM airgap intake
speed demon 750

dont know about cam yet

[Lowend]

Not a bad combo.
RE: longer rods
You could read all day and still ask the same question.
I tend towards 6" rods in a 383 as they make it easier to internal balance them.

After fitting the Vortec heads with bigger valves, springs, retainers, screw-in studs ect, you are in the price range for a good aluminum head. Money better spent.

[XTRMEASURES]

would the stock valves on the vortec be ok then

[molyorange 77]

You won't build another 350! (IMO) Bigger valves are better, smaller valve heads will suffer. longer stroke motors like to breath! like one of the other post mentioned your getting up to aluminuim head territory with alot of machine work springs studs guideplates etc, unless you already have the heads.

[XTRMEASURES]

so stock vortec heads are a waist of time?

[KsKustoms]

6" rods help to keep the cylinder wall pressure down. It makes for a better stroke to rod length ratio. This will make for a little more power and a little longer life on the motor.

As far as heads go they are really what can make or break the motor. If you are on a budget and cant affored say AFR 195's then try some of the Dart Pro 1's. We are getting a pallet of dart stuff in next week and can get you a good deal.

You will also need to pay attention to the compression of the motor. We normally shoot for about 10.5:1 depending on the cam and other factors. There is a lot to take into account when trying to build a motor to run correctly for your application.

[XTRMEASURES]

i have the vortec heads aleady, i might just put them on for now. i can build up the bottom end then later buy some better heads.

ill give you a call when i get a chance.....

thanks Mr. Kevin