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#69776 12/09/2006 9:06 PM | Joined: Jul 2005 Posts: 71 Member | | Member Joined: Jul 2005 Posts: 71 | Other than power, are there any advantages between the 270 & 261 for regular open road use? I've had no 261 experience.
Thanks | | |
#69777 12/09/2006 9:28 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The 270 is a GMC engine & the 261 is Chevy. The 270 is a more rugged engine.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#69778 12/10/2006 3:10 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | The differences include the alloy used in casting the block. The GMC was made of better stuff.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
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#69779 12/10/2006 7:23 AM | Joined: Jul 2005 Posts: 71 Member | | Member Joined: Jul 2005 Posts: 71 | Thanks - What about rpm, torque, economy etc? | | |
#69780 12/11/2006 1:34 AM | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | The 270 should top the list in all of the above. The advantage of the 261 is parts availability. I imagine in New Zealand it may be hard to find parts for either engine. Of course a 302 gmc would out perform the others and bolt right in to your cckw. | | |
#69781 12/11/2006 5:08 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I think for fuel economy it would be about a wash, and would depend on how well your carburetor is tuned. The AA-1 carb on a 302 (might be on a 270 also) or a Carter would generally outperform a Rochester B on a 261, although you could swap a Carter to a 261. You might also want to run vacuum advance, some of the big GMC's don't have one. 261's do.
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#69782 12/11/2006 10:22 AM | Joined: Jul 2005 Posts: 71 Member | | Member Joined: Jul 2005 Posts: 71 | Still plenty of 216's, 235's & 270's over here tucked away in sheds, and rebuilds are no problem, but I don't personally know anyone with a 261 - maybe it wasn't a common option imported here.
The 270 in my CCW is still fine, I was wondering about a 261 for a lighter truck. Sounds like another 270 is still the way to go though - Thanks again | | |
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