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260 to gmc 270 engine upgrade
#1118307 08/10/2015 4:32 PM
Joined: Aug 2015
Posts: 4
East Bay, California
C
Craig1948RK
Offline
New Guy
Craig1948RK
New Guy
C Offline
Joined: Aug 2015
Posts: 4
East Bay, California
I have a 4400 with a gmc 270. I drove it home so it works but it was a hack job. If GMC is so much like a Chevy, why couldn't one upgrade with same radiator brackets, etc. for an elegant conversion. Any tips now I have it all broken down to the frame.
Re: 260 to gmc 270 engine upgrade
Craig1948RK #1118561 08/11/2015 10:50 PM
Joined: Jan 2008
Posts: 4,962
Fredericksburg, Texas
C
crenwelge Offline
'Bolter
crenwelge
'Bolter
C Offline
Joined: Jan 2008
Posts: 4,962
Fredericksburg, Texas
A GMC motor is about 1 1/2" longer than Chevrolet and the front crossmember and entire radiator surround are different. They can be retrofitted professionally or you can do a hack job.
Re: 260 to gmc 270 engine upgrade
Craig1948RK #1118785 08/13/2015 3:01 AM
Joined: Jun 2011
Posts: 5,096
Longmont, CO
E
EdPruss Offline
Crusing in the Passing Lane
EdPruss
Crusing in the Passing Lane
E Offline
Joined: Jun 2011
Posts: 5,096
Longmont, CO
The GMC radiator mounts to the front of the radiator shroud. If yours is mounted to the back, it is a converted Chevy.

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.

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