topgun542

iTrader: (6)

I cant tell if this is a th400 sbc converter or a th400 to ls1 convertor...

Circle-D

iTrader: (21)

Pilot looks to short to fit a LS crank. Can not tell on the bolt circle. Do you have any LS flexplates you can test fit?

Chris

topgun542

iTrader: (6)

I Do, Im Just In College Now So I Forgot To Check When I Left, But I Need To Order A Sfi Flex Plate For When I Go he

Jake's Performance

iTrader: (2)

Looks like an LS pilot to me....

SnIpEz

iTrader: (4)

Looks like an LS pilot to me as well, but it's hard to judge from the first picture and the second picture obscures it a bit.

Circle-D

iTrader: (21)

Yes, very tough to tell from the pic. An LS pilot needs to extend about .500-.550 from the pad of the converter to properly engage in the crank. You should be able to measure that fairly easy. FYI the typical SBC will only extend .200-.250 from the converter pad. And if you can get a measurement from center of one bolt hole to the next, we should be able to calculate the bolt circle from there.

Chris

topgun542

iTrader: (6)

heres some pics of an ls flywheels with the unknown torque converter. the holes are off by about 1/4 in

Circle-D

iTrader: (21)

OK, that is just a normal SBC converter. You will need a flexplate with the smaller 10.75" bolt circle and a pilot extension to adapt over to an LS setup.

Chris

topgun542

iTrader: (6)

what would the pilot extension look like? any site will have them?

oldtimelt1

iTrader: (1)

Not sure but maybe this;
http://www.speedwaymotors.com/GM-TH3...ter,64394.html

mrvedit

Just reading about this in the January 2014 issue of Super Chevy Magazine, page 48.
They mention GM spacer # 12563543:
http://www.jegs.com/i/GM-Performance...63532/10002/-1

And longer crank bolts #11569956, quantity 6.
http://www.jegs.com/i/Chevrolet-Perf...69956/10002/-1

topgun542

iTrader: (6)

Hmmm maybe ill see what what circle d says, but that sleeve is probably what i need.

Circle-D

iTrader: (21)

You can run the crank spacer mrvedit suggested, but you will run it on the trans side of the flexplate. The spacer is designed to run with a flat flexplate on the 4L80 setup so you get the proper starter her engagement. But that has the 6 lug 11.5" bolt circle, so a no go for you. But there is a trick where you run the dished flexplate mounted to the crank and then bolt the spacer on the transmission side using it as a crank extender. And you will need to make sure the dished flexplate is a dual bolt pattern for your small GM bolt circle. Hope that made sense.

Chris

mrvedit

The picture in Super Chevy Magazine shows the crank spacer on the trans side.

topgun542

iTrader: (6)

so will the flexplate on your website wont work? i just cant find any flexplates, except for 300+. hahaha so if im catching what your saying, i need a dished flex plate and run that spacer on the trans side?

Circle-D

iTrader: (21)

Yes, our steel SFI option will work. It has the smaller 10.75" bolt circle you need. Then get the spacer and crank bolts mrvedit mentioned and you are good to go.

Chris

Circle-D

iTrader: (21)

Cool, I will try to track down the article and read it.

Chris