What is the largest CI that LT5 can be built to with stock crank?

This question is not for me, but one of the ZR-1 guys in Japan. He needs to rebuild his motor and want to build the biggest LT5 possible, but purchasing a new crank is not feasible with cost and shipping. Does anyone know what combination of liners/pistons/rods can be used and what size it will end up?

Sorry if this information is already available and posted. I could not find it if so.

Thanks!!

[1990 415]

Is he willing to do an offset grind on the crank or keep it totally stock? I believe Pete is the person to answer this question.

[jonszr1]

yeah pete can give you all the info ,but i believe its 401ci, offset grinding the crank and using 4.125 piston and liners

[Pete]

Guys i'm no engine builder/expert.

I would say stock crank offset to 3.75 with 4.125 bore makes 401.
i know this will work very well.

I also know stock crank can be offset to 3.85 but i don't know much about 1.900 rods,this will make a 411ci.

I hear different stories on the 1.900 rods they work fine in a 9k RPM Honda some say LT5 parts are heavier so it won't work.
Flyan Ryan might have more input on the 1.900 rods durability.

Pete

P.S.
My choice is 401 should get around 500rwhp w/stock cams cost is about a 1/3 of a 415ci. for the do it yourselfer.

Thanks guys!!!

I found this on EES: Using your stock crankshaft:
4.100 bore, 3.75 stroke = 396cid
4.125 bore, 3.75 stroke = 401cid

So if this is it I'll pass on to the guy.

Thanks again!!

[Polo-1]

The max I would take off the crank is .100 this gives you 2.00 rod journal and stroke of 3.75 I know some people have cut other stock cranks farther, but a LT-5 hollow crank??? I would not like to find out the hard way.
If shipping is a problem, getting the block here and back wont work for the 4.100/125. Unless AES or EES is selling the liners now? Last I heard they only do short block assembled. So your looking at sending 4" liners over sea's.

3.75x4.00 = 377ci

Go with Ron Woods HD liners punch it .060 over = 388ci.

Originally Posted by Polo-1

The max I would take off the crank is .100 this gives you 2.00 rod journal and stroke of 3.75 I know some people have cut other stock cranks farther, but a LT-5 hollow crank??? I would not like to find out the hard way.
If shipping is a problem, getting the block here and back wont work for the 4.100/125. Unless AES or EES is selling the liners now? Last I heard they only do short block assembled. So your looking at sending 4" liners over sea's.

3.75x4.00 = 377ci

Go with Ron Woods HD liners punch it .060 over = 388ci.

Okay, thanks for the info and I'll pass it on. He has been in communication with one of the builders already and they were going to send him a package for $15K to build in Japan. Sounds a little risky but I'm not sure what kind of shops he has access to there. Thanks again.

[Pete]

Originally Posted by Polo-1

If shipping is a problem, getting the block here and back wont work for the 4.100/125. Unless AES or EES is selling the liners now? Last I heard they only do short block assembled. So your looking at sending 4" liners over sea's.

3.75x4.00 = 377ci

Go with Ron Woods HD liners punch it .060 over = 388ci.

I would suggest getting a complete short block done.

With AES you use stock head gasket.
EES O-rings heads/block and use cooper gaskets more $$$$

Something to think about.
Pete

Originally Posted by 1990 415

Is he willing to do an offset grind on the crank or keep it totally stock? I believe Pete is the person to answer this question.

I'll ask him. I imagine he will want keep it stock. Thanks!

[jonszr1]

where is aes located ????