davbell22602
Contributor
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Age: 36
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Reg: 04-30-08
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06-29-12 03:28 PM - Post#2242722
I need another 351 V6 engine for a 69 gmc 7500 series truck. I cant seem to find one. I was wonder other engines can I fit in the truck. With or without changing the bellhousing on the manual transmission.
1969 GMC medium duty body 7500.
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100% CHEVY
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06-29-12 05:51 PM - Post#2242768
In response to davbell22602
Any other size GMC v-6 will fit!
If you go to a Chevy bellhousing,most Chevy small or big block will fit.
Yours a 351-C or M?
And,what's wrong with it?
Mike. 
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davbell22602
Contributor
Posts: 337
Age: 36
Loc: Winchester,VA
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06-29-12 06:26 PM - Post#2242785
In response to 100% CHEVY
Its a M. What manual transmission would be behind it? SM420? Someone didnt check the oil and it through rod at block. Block is no good now.
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100% CHEVY
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06-29-12 07:20 PM - Post#2242800
In response to davbell22602
Shame.The magnum is a hard one to come by and is popular.
I have a 351-C.
I don't know what trans you have,but maybe someone else here can tell you.
Don't junk the 351!You can easily sell the heads for sure as well as other parts.
If it has power steering and mounting brackets,those are hard to find and popular too.
Mike.
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davbell22602
Contributor
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06-29-12 07:43 PM - Post#2242808
In response to 100% CHEVY
I found 351 v6 for $750 in Iowa that has 23,000 original miles on it. I'll have to ask what letter it is though. They quoted me $750 plus $250 to ship to me.
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100% CHEVY
Very Senior Member
Posts: 5437
Age: 60
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
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06-29-12 08:55 PM - Post#2242823
In response to davbell22602
I bought mine 12 years ago,so I can't say if that's a good price or not.
Shipping sounds cheap!Mine weighs about 750 lbs!
I had to build a special engine stand for it to store it on.
There's a big difference in power between the "C" and the "M" 351's.The "M" being much better!
Mike.
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davbell22602
Contributor
Posts: 337
Age: 36
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Reg: 04-30-08
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06-30-12 06:52 PM - Post#2243112
In response to 100% CHEVY
Would anybody know where to get the adapter plate for the Chevy bellhousing if I swap to a 454 carb engine?
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100% CHEVY
Very Senior Member
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06-30-12 07:54 PM - Post#2243131
In response to davbell22602
They are hard to find and expensive!
I was watching one for $375.Pretty average price.It did sell.
It was here-
http://67-72chevytrucks.com/vboard/
Mike.
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 JimKshortstep4x4
Chevytalk Moderator & "9th Year" Silver Supporting Member
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07-01-12 02:44 AM - Post#2243201
In response to 100% CHEVY
I could not find the thread for the adapter plate. Would you happen to have a picture? Also,
if he switches to a Chevy Bell housing why would an adapter plate be needed or is the GMC V-6 transmission different from the Chevy transmission?
I don't have much experience with the V-6 trucks so I am curious!
Jim
Member 65-66 Full Size Chevrolet Club
65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/350
71 Snow plow, 4x4, 350, TH 350
Current project, 72 GMC Shortbed, stepside, 427 |
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davbell22602
Contributor
Posts: 337
Age: 36
Loc: Winchester,VA
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07-01-12 04:37 AM - Post#2243211
In response to JimKshortstep4x4
Well the sm420 was used up to a 1 1/2 ton up to 67. 1968 they started using the sm465. The max GVW rating is 24,000. I assume this is a 1 1/2 ton truck.
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100% CHEVY
Very Senior Member
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07-01-12 05:48 AM - Post#2243224
In response to JimKshortstep4x4
Jim,here is the post in the 60/66 forum-
http://67-72chevytrucks.com/vboard/showthread.php?...
I'd thought to buy this adapter,but the shipping cost would be too much.I was wrong about the price-It was $275.00.
There are some questions about the large hole in the bellhousing where the trans goes.It seems the GMC has a larger hole than the Chevy,but I haven't measured mine to see.I have both,so I may do that today.
Yes,he can just change to a Chevy bellhousing to use a Chevy engine.
Mike.
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davbell22602
Contributor
Posts: 337
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Reg: 04-30-08
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07-01-12 05:54 AM - Post#2243227
In response to 100% CHEVY
So if were to stick with the manual trans thats in it now and use a adapter to bolt up a 454?
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100% CHEVY
Very Senior Member
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07-01-12 06:08 AM - Post#2243229
In response to davbell22602
An adapter may not be needed for the manual trans if the Chevy bellhousing fits the GMC manual trans,which I think will fit.In that case,all you need is a Chevy manual bellhousing set-up which are cheap and easy to find.
I will check mine today and make sure it all fits.
Mike.
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100% CHEVY
Very Senior Member
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07-01-12 08:06 AM - Post#2243267
In response to 100% CHEVY
O.K.,I measured.
The GMC bellhousing hole is 5,1/8"
The Chevy bellhousing hole is 4,5/8"
So,your GMC trans won't go in the Chevy bellhousing unless the GMC trans is 4,5/8".I don't have a GMC trans to measure.
What I'm measuring is the piece on the front of the trans that the throw-out rides on-The diameter where it bolts to the front of the trans case.
Which means you need the adapter to use the Chevy engine(with auto trans)or change the trans/bellhousing too.
Mike.
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davbell22602
Contributor
Posts: 337
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07-01-12 08:36 AM - Post#2243273
In response to 100% CHEVY
So is the 69 GMC 7500 a 1 1/2 ton truck? The gvw max is 24,000. Gm started using the SM465 in 68 up to a 1 1/2 ton trucks.
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davbell22602
Contributor
Posts: 337
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07-01-12 10:53 AM - Post#2243315
In response to davbell22602
According to here http://www.6066gmcguy.org/SM420.htm scroll down and its says GMC Used New Process, Clark & Spicer 5-Speed Transmissions in the 4000 series & bigger Trucks.
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100% CHEVY
Very Senior Member
Posts: 5437
Age: 60
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Reg: 12-09-04
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07-01-12 11:53 AM - Post#2243338
In response to davbell22602
Biggest trucks I have are 1 tons.
Those guys on Jolley's site should be able to tell you all you need to know about GMC's
Just don't tell them about the Chevy 454! 
Mike.
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JimKshortstep4x4
Chevytalk Moderator & "9th Year" Silver Supporting Member
Posts: 4163
Loc: Muskegon, MI, USA
Reg: 03-28-02
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07-01-12 05:20 PM - Post#2243447
In response to 100% CHEVY
Mike,
Thanks for the link. The pictures were helpful and now I also understand why the GMC V-6 dust covers are different from the Chevy's.
The 5 1/8" pilot diameter may be a year issue. I have two bell housings from a 71 and a 72 and both bell housings have the 5 1/8 diameter holes.
Jim
Member 65-66 Full Size Chevrolet Club
65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/350
71 Snow plow, 4x4, 350, TH 350
Current project, 72 GMC Shortbed, stepside, 427 |
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100% CHEVY
Very Senior Member
Posts: 5437
Age: 60
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
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07-01-12 06:25 PM - Post#2243481
In response to JimKshortstep4x4
Well,my 351 is a 70 or so year model from a tandem axle dump truck.Where I got the 5,1/8" from.
I measured 2 old 4 speeds out back and 2 63/66 bellhousings for the smaller dimension.
Must have been a change in there somewhere.
Mike.
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Kamakazi620
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Posts: 60
Loc: Portland Ore
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07-09-12 12:41 AM - Post#2245975
In response to davbell22602
305 gmc v6
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davbell22602
Contributor
Posts: 337
Age: 36
Loc: Winchester,VA
Reg: 04-30-08
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07-09-12 04:49 AM - Post#2245997
In response to Kamakazi620
The 305 V6 are to hard find also.
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Old_Longboarder
Ultra Senior Member
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07-09-12 02:46 PM - Post#2246227
In response to davbell22602
305, 351,. 401, 478..., oh yeah.., and the once popular piece of crap, Toro-flow diesel V6.
"The most precious jewels you'll ever have around your neck are the arms of your children."
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davbell22602
Contributor
Posts: 337
Age: 36
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Reg: 04-30-08
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07-09-12 03:22 PM - Post#2246255
In response to Old_Longboarder
Does the 401 and 478 have same bellhousing bolt pattern like the 305/351 v6?
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davbell22602
Contributor
Posts: 337
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Reg: 04-30-08
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07-11-12 02:48 PM - Post#2247108
In response to davbell22602
Thanks for Help to everyone. After getting a better at the block. I may not need a engine after all. The hole is in the oil pan.
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davbell22602
Contributor
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Reg: 04-30-08
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07-15-12 06:16 PM - Post#2248532
In response to davbell22602
After pulling the oilpan. Also need connecting rods and pistons now also. Found a broken rod and piston skirt in the oil pan.
Can use C connecting rods in a M engine?
I found new rods for a C series, pistons, and camshaft too.
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Old_Longboarder
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07-16-12 07:12 AM - Post#2248681
In response to davbell22602
Does the 401 and 478 have same bellhousing bolt pattern like the 305/351 v6?
Yes.
"The most precious jewels you'll ever have around your neck are the arms of your children."
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