LS conversion bellhousing question

[72vega5.3]

I just bought a sachs 1050 flywheel on ebay tonight for the LS conversion. I read somewhere that you could use a BB chevy 621 bellhousing, but now I cant find the info. Anyone know for sure??
If not, I'll just get the LS conversion bell on ebay for $239
Im using a 73 corvette muncie
Also, does the 621 bell fit the tunnel without hammering?

[72 SS PNL]

the bellhousing pattern is the same as the sbc and bbc , though they add 1 bolt to the top center , and loose one on the pass side

some sbc and bbc's had the top center bolt and some didnt , some ls blocks have the meat for the side bolt , but its very close to a water jacket , its also not big deal to not use it , since GM set it up that way from the start

[283vega]

Get the conversion bell if it corrects for the different crank positioning.I cant remember if the LS crank protrudes more or less from the back of the block, but it is different and screws up trying to use all the old stuff.

[BadBowtie]

I just bought a sachs 1050 flywheel on ebay tonight for the LS conversion. I read somewhere that you could use a BB chevy 621 bellhousing, but now I cant find the info. Anyone know for sure??
If not, I'll just get the LS conversion bell on ebay for $239
Im using a 73 corvette muncie
Also, does the 621 bell fit the tunnel without hammering?

621 bellhousing is the right one and you need to mill off the dowel pins on the flywheel for the conversion. Here is a full writeup: http://ls1tech.com/forums/conversions-hybrids/1472584-mating-sbc-bbc-trans-t10-muncie-richmond-tko-ls-motor.html

However i dont know if it will fit the tunnel/firewall, might consider the ls conversion bell just because the outer diameter is smaller (steel vs ribbed aluminum).

[72vega5.3]

Thanks fella's, thats the thread I was looking for. I was hip to the dowel pin removal. I think Im going to get the conversion bellhousing

[1100kaw]

Heres my research.
The GM bell will work. Has to be be for 168 tooth flywheel. LS is only the big one. Old BBC and SBC could still use 154t or 168t, just change the starter as ness.
If you use GM621, how do you do clutch linkage? Hydrolic throw out is about the only option. Not room for mechanical or slave on standard bell in vega. (unless cutting it up a lot).
The LS crank is deeper in block than SBC and BBC. If you use a standard old style bell there is an adapter pilot bearing that fits LS crank and catches the input shaft. Its even a GM part.
On the Flywheel....
The LS flywheel uses the dowl pins to locate the pressure plate correctly.
The old stuff uses shouldered bolts for this.
TO save some money on hi dollar clutch sets for the LS, I had my LS flywheel drilled for the shoulder style bolts so i could run old style pressure plates and disc. I went ahead and had them do 10.5" and 11" patterns, in case i decided i needed more clutch. and of course. drive the pins out with a punch, no need to have the mached off.
On the bell....
Here again, I'm all about the money. Sooo. I purchased a McLeod scatter sheild that has both trans patterns. T-5 17 degree version and standard strait up version. Turns out when using the strait up mount holes, the other top hole is exactly where the pivot ball for a monza style fork needs to go. So i used this set up, cut hole in scattersheild in correct place for other end of fork. ( about 7 oclock position). Welded mount for slave cyl. And went with Wilwood clutch master.
I started to stay cable, then realized the cable wouldnt clear the big aluminum oil pan on the LS as it needs to go into bell area. So the slave cyl is on back side(tranny side) of fork and pushes it.
Hope this helps a little.

[anorexicvega]

I just bought a sachs 1050 flywheel on ebay tonight for the LS conversion. I read somewhere that you could use a BB chevy 621 bellhousing, but now I cant find the info. Anyone know for sure??
If not, I'll just get the LS conversion bell on ebay for $239
Im using a 73 corvette muncie
Also, does the 621 bell fit the tunnel without hammering?

where have you seen a conversion bellhousing for that price?