I am in athe process of building my motor. My crank was destroyed when it went and i figured it would be a good time to buy a 383 crank. I ordered a eagle cast crank of ebay. The way i understand it is that i can just get the crank and have my flexplate balanced to my rotating assembly. The crank i bougt is for 86 and newer external balanced 1 piece rear main blocks. My mechanic says that the rods/pistons won't work and that the piston hole is in offset and rods are differnt lenghts. Is this correct? I ordered .30 over Speed pro forged pistons in the summit rebuild kit that comes with everything. This is the set up i plan:

Speed Pro Forged pistons .30" over
Stock rods with ARP rod bolts
eagle ESP crank w/ ARP main studs.

I think this ought to be a fairly reliable bottom end for about 450hp.

Please tell me if something is wrong because i have to buy the parts ASAP to get my car on the road again.

thanks
Shawn

 

Stock stroke is 3.48" while a 383 uses 3.75" If nothing in the rod/piston is changed when using a 383 crank, than at TDC the piston would be 3.75-3.48=.27", .27/2= .135" higher. Because of this if you used a rod/piston combo for a 350 on a stroker crank you'd ram the piston straight into the cylinder head at TDC

Stroker pistons tend to have the pin located higher up into the piston. This is why overly large strokes (ex. 396) aren't always the best use for extremely high cylinder pressures such as lots of nitrous or boost, the pistons crowns are more vulnerable.

You may reuse the rods if the pistons you select are for 3.75" stroke and 5.7" rod (stock)

 

uhhh no

the rods could be used but the pistons use a different pin hight sorry you need to get the pistons for a stroker

 

well recomend me some decent forged pistons for this set up.

Thanks
Shawn

 

Since this isn't for any kind of extreme RPM or boost/nitrous I would look into something like SRP.

 

I do plan on a 150 shot of nitrous. I figure Speed pro or TRW pistons will work.

thanks
Shawn

 

ha, ha, ha, speed pro or trw, thats funny. Seriously though, listen to the man and use srp pistons made by je. If your on a budget id get a keith black hypertecnic before id get either one of the ones you listed. Hope this helps. Prorac1.

 

so even if i am going to use nitrous the KB hyper pistons are better?

Thanks
Shawn

 

I wouldn't advocate the use of hypereutectic pistons on any nitrous/boost applications. They are rather brittle and don't take kindly to detonation.

 

yeah that is what i thought too.

thanks
Shawn