Quick Help. 1 or 2 piece rear main seal??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CheyLadd · 06-13-2007, 03:15 PM

I am going to look at a 350 block to put in my truck and I need to know if a 1 piece rear main seal will work. It is going in a 72 chey super 4X4 with a 350 and 4spd manual. Quick help in needed. The guy selling it doesn't know and I don't either. Thanks.

casterbuster · 06-13-2007, 03:17 PM

Don't know why it wouldn't

**truckdude239** · 06-13-2007, 03:54 PM

I Believe They Started Using One Pieces Int He 80s The 78 Motor I Just Built Had A 2 Piece

centsless · 06-13-2007, 04:29 PM

Either motor will work. They are totally interchangeable. The difference is the flywheel and starter. They are different from the one pc. to the two pc. rear main motors, but both will work with the transmission.

1970shortbed · 06-13-2007, 04:34 PM

i like 2 pc because it is easier to change

CheyLadd · 06-13-2007, 08:14 PM

So I guess that means I get to buy a new flywheel and starter. Probably should anyway I guess. Motor looks good. Here is what they claim: 4 bolt main. bored .030 over, new 2.02 heads, 10.5:1 pistons, roller rockers, custom cam, air gap intake. Intake and heads are new.

The motor was rebuilt a couple of years ago and then sat without being installed. HP claims are high, 400+, but I don't put a lot of weight on claims without something to back it up.

Should be a good learning experience for me. I dropped a turnkey motor into my old 72 sub 3/4 4X4 when I had it without a problem but have never had to build from this level. Many questions to come, I am sure.

Thanks for the input at this point.

RACINJASON22 · 06-14-2007, 01:10 AM

High 400 hp is a little hard to belivre but, May I ask what they are asking. I't not out of the question but don't want you over spending.

Centsless is right they will intercahnge all but the flywheel and starter.

I personally like the one peices design all but haveing to ever change the rear main myself it is a better design other than that.

RJ22...

06-13-2007, 03:15 PM	#1
CheyLadd Registered User Join Date: Oct 2006 Location: Glendora, CA Posts: 85	Quick Help. 1 or 2 piece rear main seal??? I am going to look at a 350 block to put in my truck and I need to know if a 1 piece rear main seal will work. It is going in a 72 chey super 4X4 with a 350 and 4spd manual. Quick help in needed. The guy selling it doesn't know and I don't either. Thanks.

06-13-2007, 03:17 PM	#2
casterbuster Mejor Que Nada Join Date: Jun 2006 Location: texas Posts: 232	Re: Quick Help. 1 or 2 piece rear main seal??? Don't know why it wouldn't __________________ The only thing that separates "Dreams" from "Reality" is TIME and MONEY!!!

06-13-2007, 03:54 PM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Quick Help. 1 or 2 piece rear main seal??? I Believe They Started Using One Pieces Int He 80s The 78 Motor I Just Built Had A 2 Piece __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

06-13-2007, 04:29 PM	#4
centsless sufficiently talented fool Join Date: Jun 2006 Location: Forest Hill, MD Posts: 2,231	Re: Quick Help. 1 or 2 piece rear main seal??? Either motor will work. They are totally interchangeable. The difference is the flywheel and starter. They are different from the one pc. to the two pc. rear main motors, but both will work with the transmission. __________________ "it's impossible to be surrounded by idiots when you are part of the circle" 2003 Suburban 2002 Pontiac Montana 1981 Corvette 1966 Impala Convertible Click here to support the board

06-13-2007, 04:34 PM	#5
1970shortbed Active Member Join Date: Jun 2007 Location: Upstate new york Posts: 240	Re: Quick Help. 1 or 2 piece rear main seal??? i like 2 pc because it is easier to change

06-13-2007, 08:14 PM	#6
CheyLadd Registered User Join Date: Oct 2006 Location: Glendora, CA Posts: 85	Re: Quick Help. 1 or 2 piece rear main seal??? So I guess that means I get to buy a new flywheel and starter. Probably should anyway I guess. Motor looks good. Here is what they claim: 4 bolt main. bored .030 over, new 2.02 heads, 10.5:1 pistons, roller rockers, custom cam, air gap intake. Intake and heads are new. The motor was rebuilt a couple of years ago and then sat without being installed. HP claims are high, 400+, but I don't put a lot of weight on claims without something to back it up. Should be a good learning experience for me. I dropped a turnkey motor into my old 72 sub 3/4 4X4 when I had it without a problem but have never had to build from this level. Many questions to come, I am sure. Thanks for the input at this point.

06-14-2007, 01:10 AM	#7
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Quick Help. 1 or 2 piece rear main seal??? High 400 hp is a little hard to belivre but, May I ask what they are asking. I't not out of the question but don't want you over spending. Centsless is right they will intercahnge all but the flywheel and starter. I personally like the one peices design all but haveing to ever change the rear main myself it is a better design other than that. RJ22... __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

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