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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2011 Posts: 42 'Bolter | | 'Bolter Joined: Oct 2011 Posts: 42 | I bought a 270 to put into my truck. Motor is old military motor reconditioned at Red River TX base. As I begin to get into this I notice the crank pulley has slotted groove like for hand crank on my tractors. Do I need to replace this if I put in my truck? I am thinking the current pulley will extend to far forward. My crank pulley looks like this one. http://www.ebay.com/itm/47-48-49-50...ries&vxp=mtr&hash=item255eaf7260
Be the person you would want as a friend because at the end of the game the King and Pawn go in the same box.
| | | | | Joined: Sep 2003 Posts: 200 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 200 | I don't know the length of a 270, but I have the same pulley onmy 51 216.
1951 Chevy 3100
Some days you get the bear. Some days the bear gets you.
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | I presume you have a GMC truck for the GMC engine.
I got a new front pulley/harmonic damper for my 302, same as 270, from a 292 Chevy engine, same shaft, keyway dims; 2 groove pulley, 3/8 belt. I have heard of 3 groove pulleys, but didn't need that. Machined a little off the end so it would line up w/ 302 water pump, alternator. I couldn't find another modern harmonic damper.
'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.
| | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | google harmonic balancer, harmonic dampers, and a whole pile of things show up, there is damper dudes, and damper doctor that come to mind right off hand. They aren't that hard to find. These are brand new or at least freshly revulcanized. | | | | | Joined: Oct 2011 Posts: 42 'Bolter | | 'Bolter Joined: Oct 2011 Posts: 42 | Correct - GMC motor into 1949 or 1950 GMC 1/2 ton. I am swapping out the 228 and will be replacing with the 270. I presume you have a GMC truck for the GMC engine.
I got a new front pulley/harmonic damper for my 302, same as 270, from a 292 Chevy engine, same shaft, keyway dims; 2 groove pulley, 3/8 belt. I have heard of 3 groove pulleys, but didn't need that. Machined a little off the end so it would line up w/ 302 water pump, alternator. I couldn't find another modern harmonic damper.
Be the person you would want as a friend because at the end of the game the King and Pawn go in the same box.
| | | | | Joined: Oct 2011 Posts: 42 'Bolter | | 'Bolter Joined: Oct 2011 Posts: 42 | Thanks and will check that out. google harmonic balancer, harmonic dampers, and a whole pile of things show up, there is damper dudes, and damper doctor that come to mind right off hand. They aren't that hard to find. These are brand new or at least freshly revulcanized.
Be the person you would want as a friend because at the end of the game the King and Pawn go in the same box.
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