Sorry I forgot to say, im putting a 465-203/205 behind it, and a stock hyd bellhousing will it work I told it would. I have no ls experience! Please help
The bellhousing will bolt up with the exception of one bolt at the top, BUT
the crank flange on an LS engine sits about 10mm deeper than a SBC so you're gunna need a custom flywheel/clutch or have your bellhousing modded.
this shouldnt be neccessary. all you need is the small crank spacer and bolts. they were stock on later (mid 00+) 6.0's that use the shorter LS1 style crankshaft bolted to a 4L80E. this brings everything south of the crankshaft, (clutch and flywheel included) out to traditional SBC locations.
My motor has six holes and no hole on the passenger side next to the center top hole. The bellhousing fit and threaded in 5 bolts and I can see the top one is not going to work, but the 6 bolt has no hole on the block?
You can only use five bolts with the early bellhouse's. The top one isn't case in the bellhouse. And the pass side upper middle isn't drilled in the LS1 block and you can't drill and tap it you will hit the cylinder.
It will be fine with 5 bolts even high HP motors have been run like this all day long on LS1tech with no problems.
The stock 4.8/6.0L GM flywheels is thicker it accounts for the .400 spacing, the LS1/2 do not. So no spacer need if using it.
To fit a 5.3L/6.0L to an 'old school' style manual transmission this is what you need:
- Flywheel from a '06 4.8L or 6.0L, they are the same flywheel. It is thicker to make up for the .400" difference. you do not need a spacer. The flywheel can be had new in the aftermarket for $60, Sachs NFW1050.
- This flywheel is drilled for the old school chevy 12" clutch cover and uses 3/8" shoulder bolts to bolt the cover plate on. So you have to open the holes to match the 10mx1.5m bolt holes in the flywheel. And run the LS style metric bolts sold everywhere.
- You will need an extended pilot bearing. GM 12557583
Had a question about which bolts to use with the flywheel above.
The SBC pressure plate use a 3/8 thread shouldered bolt so the hole in the plate are little bigger than 3/8's. And the Sachs NFW1050 in question uses a non shouldered LS1 style M10x 1.5M bolts.
So you need to open the pressure plate holes to match the 10mm bolt for the flywheel. Its not much can't remember off top of my head. Just measure a new bolt and open it up to just alittle bit bigger.
Hope this helps.
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