Re: GM sportsman Bow Tie sbc block question
 

Two piece...

Re: GM sportsman Bow Tie sbc block question
 

L.Fite .. now confused that you think its a 2 piece where as Mike P thinks its a 1 piece .. so a 1 or 2 piece would have different hole dia on the rear flange if one was ordering a new flywheel or flexplate ?

Re: GM sportsman Bow Tie sbc block question
 

Yes, two piece and one piece flexplates are different. Yours must be a two piece (as Eman said) a one piece can NOT have a flange on it.

Re: GM sportsman Bow Tie sbc block question
 

so there must be two hole diameters to locate the center to mount the 6 bolts

Re: GM sportsman Bow Tie sbc block question
 

Yes, that is correct.

Re: GM sportsman Bow Tie sbc block question
 

Sorry...
If the crank has a flange it is two piece like the old BBC/SBC...
One piece has no flange, per se... like LS...

Re: GM sportsman Bow Tie sbc block question
 

Two piece main seal chevy cranks
(play the video to see actual picture)

https://youtu.be/XmYPxvZLu90?t=33

These are picture of two piece crank flanges

Re: GM sportsman Bow Tie sbc block question
 

One piece... No flange...

https://youtu.be/Vai-4Mh5_Io?t=5
Hope this helps.

Re: GM sportsman Bow Tie sbc block question
 

What I have in those crank flange photos is like 327 small j & the 350 photo ..so must be 2 piece ⁹

Re: GM sportsman Bow Tie sbc block question
 

In the original post the question was whether the block was 1 or 2 piece. That is how I answered the question. He did not ask about the crank. If the crank has a flange like the older style then it is a 2 piece seal and will take the older style flex plate.