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Question on 305

 
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Project_1986_TA
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Joined: 13 Jan 2004
Posts: 198
Location: Burien/Seatac


PostPosted: Wed Feb 06, 2008 11:19 am    Post subject: Question on 305 Reply with quote

Does the LB9 305 crank have a 1 piece rear main seal? Im trying to sell my old motor and i have no idea.
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305 302eater
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Joined: 18 Feb 2007
Posts: 604
Location: port orchard

1992 Chevrolet Camaro RS

PostPosted: Wed Feb 06, 2008 11:48 am    Post subject: Reply with quote

Yes it does.
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Dewey316
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Joined: 08 Jan 2004
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Location: Bringing the tech

1990 Chevrolet Camaro RS

PostPosted: Wed Feb 06, 2008 11:56 am    Post subject: Reply with quote

It depends on what year it is from.
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Twilightoptics
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Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Wed Feb 06, 2008 12:39 pm    Post subject: Reply with quote

You need to look at it then LOL.

A 1 piece rear seal will have a big round thing bolted to the back of the block.

A 2 piece rear seal all you'll see is block and crank.

86 they started the change over so it depends on when yours popped out.

Quote:
Yes it does.


My '85 LB9 was a 2 piece. :O)
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Project_1986_TA
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Joined: 13 Jan 2004
Posts: 198
Location: Burien/Seatac


PostPosted: Wed Feb 06, 2008 12:53 pm    Post subject: Reply with quote

mine was an '86. I might just have to look i guess. thanks guys
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rjmcgee
The Hammer


Joined: 08 Jan 2004
Posts: 2320



PostPosted: Wed Feb 06, 2008 1:33 pm    Post subject: Reply with quote

If the motor is original then it should have been a 2 piece. Are the valve covers center bolt or perimeter bolt. They did that switch at the same time as the rear main.
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Project_1986_TA
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Joined: 13 Jan 2004
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PostPosted: Wed Feb 06, 2008 4:01 pm    Post subject: Reply with quote

i had perimeter bolts on the valve covers.
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Dewey316
The Lama


Joined: 08 Jan 2004
Posts: 7295
Location: Bringing the tech

1990 Chevrolet Camaro RS

PostPosted: Wed Feb 06, 2008 4:02 pm    Post subject: Reply with quote

It is most likely a 2peice rear main then.

--John
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DBL_TKE
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Joined: 28 Feb 2007
Posts: 1505
Location: Aloha, OR

1991 Chevrolet Camaro Z/28

PostPosted: Wed Feb 06, 2008 6:12 pm    Post subject: Reply with quote

I thought they switched to center bolt valve covers in '87?
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rjmcgee
The Hammer


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PostPosted: Wed Feb 06, 2008 6:15 pm    Post subject: Reply with quote

They did.

and 1 piece rear main,

and roller cams
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Twilightoptics
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Joined: 13 Jan 2004
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Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Wed Feb 06, 2008 6:35 pm    Post subject: Reply with quote

rjmcgee wrote:
They did.

and 1 piece rear main,

and roller cams


Some '86 blocks were 1 piece rear, and cut for rollers but still had a tappet cam.
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305 302eater
Member


Joined: 18 Feb 2007
Posts: 604
Location: port orchard

1992 Chevrolet Camaro RS

PostPosted: Wed Feb 06, 2008 9:30 pm    Post subject: Reply with quote

Ok my bad guess I'm used to the "newer" style small block. Thought the LB9's were one of those, thats why I said yes. Didn't know they came out in 85. And I thought I was a third gen geek. Laughing
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chevymad
Master B


Joined: 11 Jan 2004
Posts: 5472


1987 Pontiac Formula

PostPosted: Wed Feb 06, 2008 9:38 pm    Post subject: Reply with quote

I've got a motor out of an 86 Z ,.. its a 1 piece main, has the castings for a roller cam. But isnt machined for it, has a flat tappet. My 87 has roller and 1 piece main.
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Sat Feb 09, 2008 11:47 am    Post subject: Reply with quote

Another way to tell is whether or not the flywheel has a counter balance (metal slug) attached to it. 1-piece rear mains need to be externally balanced by the flywheel. 2-piece rear mains were internally balanced except the 400 small block.
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Twilightoptics
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Joined: 13 Jan 2004
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Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Sat Feb 09, 2008 7:13 pm    Post subject: Reply with quote

QwkTrip wrote:
1-piece rear mains need to be externally balanced by the flywheel.


Negative. The thirdgen 1 piece rear motors are internally balanced.
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