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| | | | Joined: Jan 2004 Posts: 223 'Bolter | | 'Bolter Joined: Jan 2004 Posts: 223 | This may be a dumb question, but are these cranks interchangable? Is is just bore difference between these engines or stroke as well? Are the rod journals on the crank different diamaters? The reason I ask is I bought a 261 with a claim of recent rebuild. Had been ran since and was aware of "rumbling" noise. Pulled the head and pan. Haven't torn down completely yet. Everything looks good and like it was recently rebuilt but extremely excessive clearance rod to crank on every single cylinder. More than wear could accomplish or wrong bearings. (You can move every rod back and forth by hand.) Any possibility of someone using wrong crank?
Thanks in Advance,
Steve O. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Nifty 50,
The 1953 CHEVROLET SERVICE NEWS states with regards to the the new 1954 261 cu. in. Heavy Duty Engine "The same stiffer structure crankshaft of the regular 1954 truck engine [235 cu. in.] is used, providing the same 3 15/16 inch stroke." and later "The connecting rods (on the 261), which have larger sections for increased rigidity and strength [than those used on the 235], retain the same 27 degree oil jet hole for cylinder wall lubrication and use identical insert-type big end bearing and rod caps as the regular production engines."
Tim | | | | | Joined: Jan 2004 Posts: 223 'Bolter | | 'Bolter Joined: Jan 2004 Posts: 223 | Thank Tim, then I have to change my thinking, maybe a too agressive gring on the crank journal and wrong sized bearings. | | | | | Joined: Nov 2000 Posts: 582 Shop Shark | | Shop Shark Joined: Nov 2000 Posts: 582 | From what I've read from previous posts, the cranks are the same, the rods are heavier. | | |
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