I'm gathering parts for building my 408 stroker. I have a used LQ4 block and have just received most of my parts in the last couple of weeks. I bought a Callies DragonSlayer 4.0 Crank (beautiful piece by the way), CompStar rods and some other parts from the good folks at Thunder Racing (one of several excellent sponsors). I also ordered a GM Crank Spacer to go between the output end of the crank and the flexplate. The counterbored side of the spacer is smaller in diameter than the male end of the centering portion that projects out from the crank by maybe .015" (haven't measured it yet). I plan to just have the spacer turned on a lathe until it will mate with the crank. This won't be a problem, but I was surprised that it is an issue. Has anyone else run into this?

Thanks,

Steve

 

Do you think it's too much to heat it and get it on there? I just did a 408 also but, I am using a 4l60 instead of an 80 so I didn't need the spacer.

 

It might work to heat the spacer, but I'd rather have the clearance so that it could easily be removed to replace the rear main seal or just to use the crank in something else without having a heck of a time in removing the spacer.

Steve

 

TTT,
Has anyone used the spacer on a 4L80E?
Thanks,
Steve

 

I used a spacer with my Yank converter,but my Precision converter was setup to use a 4L60E flexplate.I never had any issues with the spacer fitting my Eagle crank.

 

Thanks Whitt1.
Did you use the GM Spacer?
Did you have to press or drive it on or was it easy to put on the crank?

Thanks,

Steve

 

I used a GM spacer and I didn't need to press it or hammer it at all.

 

I went to the public library here in Wichita today and looked up the spacer installation in the 2003 factory manual. The spacer is an interference fit on the crankshaft and you are supposed to pull the female portion onto the male guide with the bolts, tightening in three steps according to a specified pattern. Removal of the spacer uses the two threaded holes and two of the flywheel bolts as jack screws to pull the spacer off.

Rhino79 and Whitt1, thanks for your responses.

Steve

 

Sometimes I think that GM does stuff like this just to be funny. There is a much easier way to do it but they choose the hard way