Re-Gasketing the 350 ???

[reddog64]

I've got a new/used 350 to drop into my project and am going to tear it down to a short block and regasket it all...

My question is this... I dont have to remove the crank to replace the main seals on the front n rear of the crank do I ??

 

[ftn96]

Depends on if it is a 2 piece or 1 piece seal.
On the 2 piece, no, 1 piece yes.

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[reddog64]

anyway to tell if it is one or two... it's a 1977 block maybe a 78...

 

[ftn96]

wEll, you can take the oil pan off. Or you can get the casting number off it and got to www.nashvillek5.freeservers.com

 

[Triaged]

They didn't start using 1-piece seals till '87.

'71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
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[Blazer1970]

Even with a 2 piece rear main you do not have to remove the crank to replace the rear seal. Just remove the rear main bearing cap, and you can push the top half of the seal around the crank to get it out.

Tim

70 Blazer CST 4X4 350 SM465 NP205
87 Burb 4X4 350
01 GMC 2500HD 4X4 Duramax/Allison

 

[Mr.Chevy4x4]

Actually the one piece seals started in '86. Either way you don't have to remove the crank shaft to relpace the rear main seal. For the two piece design you will have to remove the oil pump and the rear main cap. The front seal is in the timing cover.

'85 K5 : Run it til it breaks, then fix it and go again!