355ss

iTrader: (9)

I have a built Lt1 T56 w/ a twin street clutch, the whole package has about 350 miles on it. I would like to switch to a Ls1 and I have read that I will need to switch the bellhousing, front plate and input shaft. I understand why this needs to be done. But I would like to keep using the clutch setup I have. The bellhousing will bolt to the ls1 block but will be missing 1 of the 6 attachment bolts (no different than a th400 swap) correct? If I bolt them together like this the input shaft will be .400" short correct? Gm makes a crankshaft spacer that is used to bolt on the 4L80E. With this and a custom pilot bushing, wouldn't this swap work (I am not sure about the ring gear to starter interface)? Or if I switch to a Ls1 input shaft (which I think is ~1" longer) no crank spacer and add and spacer to the bell housing wouldn't this work as well? Is there any difference between the Ls1 and SBC crankshaft bolt circle I think I remember that the Ls1 is 3.11" and the SBC is 3.00"

In my mind this seems do able????

355ss

iTrader: (9)

I have found out that the crankshaft bolt circle is different, so if I have a custom flywheel made for the correct offset and bolt circle is there any reason this swap won't work???

1981z28owner

a clutch from a LT1 will not usual work with a LS1 unless you do some modifying. The LT1 uses a pull clutch, and the LS1 using a push clutch.

daniel6718

iTrader: (36)

the way they work are differeant...the bolt pattern i think is diff...its better to sell and buy the correct one