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Joined: Oct 2006
Posts: 185
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OP
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Joined: Oct 2006
Posts: 185 |
Where is a good source for a new type rear main seal for a GMC 302? Also what size of a drain hose are you guys using on your turbos?
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Joined: Dec 2005
Posts: 452
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Joined: Dec 2005
Posts: 452 |
Gary, 1/2" on small turbos, 5/8" most common most turbos, 1" very large turbos, I use a 5/8 hose, most important is a straight drop with as little turns as possible.
Harry
Turbo-6
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Joined: Oct 2006
Posts: 185
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OP
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Thanks, Harry, I've been using a 1" ID rubber hose and I think I am loosing oil pressure with such a large hose. My Turbo is a Rotomaster HX35. Do you think that is possible?
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Joined: Jan 2005
Posts: 2,123 Likes: 3
1000 Post Club
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1000 Post Club
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Sometimes I wonder why I bother.
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Joined: Oct 2007
Posts: 5,015 Likes: 47
1000 Post Club
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I know one guy who used a MOPAR rear main seal on his 302. I was never quite clear on how it was done but know it took some machine work.
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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Joined: Sep 2008
Posts: 3,669 Likes: 42
1000 Post Club
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1000 Post Club
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You can check with Rich Fox, he has done that mod with the rear main seal before.
Class III CNC Machinist/Programmer
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Joined: Dec 2005
Posts: 452
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Joined: Dec 2005
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Gary, Drain has nothing to do with oil pressure, if smoke is coming from exhaust may have a bearing problem otherwise loss is from something else.
Harry
Turbo-6
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Joined: Sep 2008
Posts: 3,669 Likes: 42
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1000 Post Club
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Sometimes I wonder why I bother. Ahhh, your not much of a "bother" at all..... 
Class III CNC Machinist/Programmer
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Joined: Aug 2006
Posts: 289
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Gary I have always used the "rope" seal and never had a problem. I always tried to find old NOS ones so it will still have asbestos in it's construction. Pontiacs and some early Fords worked fine. With a vacuum pump all is forgiven. As for the Dodge it's for a 360 and slightly too big. You also need to polish out the cross hatches on the stock crank for the correct seal making the rope useless.
I believe one of our oldest members Walter Smith #23 uses this on his GMC Modfied in Conneticut. I would cut one short on one side only and leave the second side stock so the split of the seal was not the split of the cap to the block. I do this also with the rope and it's tricky to do...Hey but what do I have but time...........JD
216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later
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Joined: Oct 2007
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I like the ones from Best Gasket. They come with template to help cutting to length and it fills the grove. They also make the best side and valve cover gaskets I have used. I got mine from Patricks.
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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Joined: Jun 2007
Posts: 1,411
1000 Post Club
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1000 Post Club
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I've heard the best gaskets ones are a graphite fiber coated with Teflon.
Izat so?
My, what a steep learning curve. Erik II#5155
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Joined: Oct 2007
Posts: 5,015 Likes: 47
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Here is a LINK to their web site.
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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