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New GMC owner with questions #710730 Tue Jan 11 2011 12:48 AM
Joined: May 2005
Posts: 324
T
tri5trucking Offline OP
Shop Shark
I have alot of task force chevys but decided to save this really nice 49 GMC from the scrappers. I traded my own scrap pile for this truck and a 56 2 ton GMC with a running 302 in it. My questions is, will the 302 fit right in this 49? I don't know my GMC motors that well. It currently appears to have a non running 60's style chevy 6 in it at this time. Thanks for any advice.

http://good-times.webshots.com/photo/2505323880101465522fEJqNH

Re: New GMC owner with questions [Re: tri5trucking] #710735 Tue Jan 11 2011 12:57 AM
Joined: Sep 2001
Posts: 28,452
tclederman Online
Boltergeist

The '49 GMC (1/2 ton?) most likely came with a 228 in it. I think the 302 has similar exterior dimensions/mounts and should be a straight-forward installation. However, wait to hear from someone who really knows.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: New GMC owner with questions [Re: tclederman] #710743 Tue Jan 11 2011 01:26 AM
Joined: Nov 2005
Posts: 5,484
3
3B Online
Master Gabster
Hy tri5trucking and guys, yes the 302 will bolt right in place, if you use the correct engine front mount plate, and bellhousing, hope that helps.

Re: New GMC owner with questions [Re: 3B] #710752 Tue Jan 11 2011 01:59 AM
Joined: May 2001
Posts: 8,386
Cletis Offline
Extreme Gabster
To elaborate on what 3B said...

The 302 probably has side mounts. You will need the front mount plate from an earlier GMC or a 235 Chevy.

Being in a 2-ton it probably has the bigger flywheel and clutch. If the engine in the '49 is a 235 you can use that bellhousing but you will need to find a 6 bolt GMC pickup flywheel. A '54-55 will have a 6 bolt 6V flywheel and a '56-59 will have a 6 bolt 12V flywheel.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
My TRUCKS website
Re: New GMC owner with questions [Re: Cletis] #710776 Tue Jan 11 2011 03:22 AM
Joined: May 2005
Posts: 324
T
tri5trucking Offline OP
Shop Shark
Thanks for the info. It appeared to look like a 235 currently in the truck and I had heard the GMC motors were longer. I'll know more about it when I get it home tommorrow.

Re: New GMC owner with questions [Re: tri5trucking] #710783 Tue Jan 11 2011 03:56 AM
Joined: May 2001
Posts: 8,386
Cletis Offline
Extreme Gabster
Yes the GMC is longer. Unless the '49 is Canadian built the crossmember had to be modified to install the 235.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
My TRUCKS website
Re: New GMC owner with questions [Re: Cletis] #710956 Tue Jan 11 2011 07:56 PM
Joined: May 2009
Posts: 13
B
BruceJr. Offline
New Guy
Go to oldGMCtrucks.com This website has a wealth of info and the people on the forum are extremely knowlegeable.

Last edited by BruceJr.; Tue Jan 11 2011 07:57 PM.
Re: New GMC owner with questions [Re: BruceJr.] #711657 Fri Jan 14 2011 01:11 AM
Joined: May 2005
Posts: 324
T
tri5trucking Offline OP
Shop Shark
So if I want to convert to a 12 volt system I need the 12V flywheel?

Re: New GMC owner with questions [Re: tri5trucking] #711669 Fri Jan 14 2011 02:04 AM
Joined: Dec 2004
Posts: 1,899
B
bigbadswingdaddy Offline
Shop Shark
Originally Posted by tri5trucking
So if I want to convert to a 12 volt system I need the 12V flywheel?


No, The 6 volt starter will work fine on 12 volts. Just remember not to crank it too long, as that will cuse the windings to burn up over time.

If you want to put a 12 volt starter on, then you will need a 12 bolt flywheel. The 6 volt flywheel will work for a bit, but it will get chewed up pretty fast by the 12 volt starter.
However, the 12 volt 6 bolt flywheel is much easier to find.


Moderated by  Woogeroo 

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