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#10794 12/02/2003 7:16 PM | Joined: Oct 2003 Posts: 5 New Guy | | New Guy Joined: Oct 2003 Posts: 5 | My casting # on the block is a 216, but the rod and main bearings are sleeve bearings. It has the dip oiler setup in the pan and on the rods, so has the crank been undercut, or did somebody swap a 235 crank? The engine is bored .040, rods and mains .020.
What are the bore/stroke specs for 216 vs 235?
What bolt size is used on the crank pulley? My threads are clogged and I don't want to use the wrong tap to clean the threads.
Last question. What shop manual is best and readily available for specs on the 235? Torque tables, valve adjustments, timing, etc. I am thinkin Haynes or Chilton? | | |
#10795 12/02/2003 8:32 PM | Joined: Nov 2000 Posts: 1,969 'Bolter | | 'Bolter Joined: Nov 2000 Posts: 1,969 | Someone with more knowledge may jump in...but I understand that a 235 crank will go in a 216. Bore & stroke: 216 3.500 x 3.750, 235 3.563 x 3.938. The bearing journals are the same diameter, rod and main respectively, for the 216 and 235. Old hot rod books from the early 50s, like California Bill's, describe this transplant. The rods have the same center distance. The block/deck was just 3/16" taller for the 235 than the 216. Apparently it was common to rebuild 216s and machine the rods for insert bearings in the old days, and those replacement bearings are still available at Jim Carter's and other vendors. The problem with the 235 crank in a 216, as I see it is the deck height. The top of the piston will stick up above the top of the block 3/16" unless you have special pistons that are shorter from the wrist pin center to the top. I don't know if they are still available. If so, it would be a cool way to convert to full pressure rod oiling and increase displacement. I would recommend a reprint Chevrolet Shop manual for your vehicle. I know the truck manuals are available from most of the vendors. Good luck.  Edit: Revisiting this old thread to correct my mistake. The pistons will stick up above 3/32 instead of 3/16. The difference in strokes is 3/16 between 216 and 235 and half of that is the radial difference which is 3/32.
Last edited by Frank50; 05/21/2020 2:51 PM. Reason: correcting error
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#10796 12/02/2003 8:40 PM | Joined: Jan 2001 Posts: 428 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 428 | Let's see now,216 has a 3-1/2" bore,3-3/4" stroke. 235 has a 3-9/16" bore,3-15/16" stroke.Could be a 235 crank,but would require special pistons because of longer stroke. Some oldtime nanufacturer used to make them,Mcgurk or Nicson I think. I have a 1952 J.C. Whitney catalog where you can purchase a 216 shortblock with the 235 crank. But I highly doubt that's what you have. Someone probably converted the babbit rods to inserts at a previous rebuild. If done properly they're fine.
As for the bolt holes on the balancer,they're 3/8"-18 or course thread.
I like the factory shop manual best. | | |
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