how far forward to move engine?(big block swap)

[ckato4477]

How far forward from the original mounting points do i have to move the big block to clear the firewall without having to clearance it?

this is for a 72 blazer in case that mattered

[turp mcspray]

On mine, I added a th400 with the bb. The th400 to 250 adapter, moved the transfer case stick location by 1 inch. So I moved the transfer case BACK 1 inch, to keep the stick in the original location. My engine ended up being 2 inches forward from the factory v8 position. With a short water pump, a 2 wd fan shroud, and factory clutch fan setup, the fan blades are half in/half out of the shroud. Everything looks like came from GM that way!

[tjsblazer]

Originally Posted by turp mcspray

On mine, I added a th400 with the bb. The th400 to 250 adapter, moved the transfer case stick location by 1 inch. So I moved the transfer case BACK 1 inch, to keep the stick in the original location. My engine ended up being 2 inches forward from the factory v8 position. With a short water pump, a 2 wd fan shroud, and factory clutch fan setup, the fan blades are half in/half out of the shroud. Everything looks like came from GM that way!

Is you suspension factory ride height or do you have a lift. I'm curious about clearance between the engine x-member and front diff.

[ckato4477]

Turp, how much clearance between your valve covers and firewall do you have? Any pictures of it?
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[turp mcspray]

I do have a 6" lift. I extended my cross member by 2", so I could use a large factory oil pan. (6 or 7 quart) These are original, wore out springs, but with stock height, you may not have enough clearance. Here are a few pics. Lots of firewall clearance.

[ckato4477]

Perfect thank you. 2" forward it is then.
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[BLT-NT-BOT]

I moved mine forward 2" also and seem to have plenty of clearance. I am also running a 6" lift, so the pan to axle clearance wasnt a problem.