having trouble getting the new pilot bearing in the crank. so i went to the parts store and bought another one, same thing, it wont go. i thought all chevy pilot bearings where the same. its a 65 truck engine, tranny is muncie m21 anybody else ever run into this? its fresh back from the machine shop so its not like its full of rust or anything. oh, and it made 375hp & 430 tq on the dyno
409 pilot bearing
- Thread starter jd63
- Start date
Is this a 348 crank?
That was my thought as well as the Turboglide was used on the 348's and my understanding was the pilot bearing for the turboglide crank used the smaller pilot bearing. Here is a post by GOSFAST.
This is to convert the Turboglide cranks to the standard G.M. line!
Pioneer's part number is PB-656-R. There is one other PB-656 listing for the Corvairs and the suffix code is "C". (PB-656-C)
http://www.348-409.com/forum/index.php?threads/pilot-bushing-probs.11704/#post-99976
never had a problem with the Timken bronze pilot bushing 
I purchased one and it did not work so I had a friend machine one for me.
Just ran into the same problem with my 65 348 truck engine,ordered one from Show Cars for the 3 speed-4 speed set up and it was too big. Contacted them and was informed that it could be either of the three. For 9 bucks they are sending the other two so I know one will fit 
I always use the GM roller bearing that was used for diesel apps. Best bearing out there besides the expensive kevlar ones and only costs $11Beware of bronze ones floating around. A lot of them have iron in them
. Check with a magnet before use.
Hey Shiftem'.............
Would you just happin to have a part # for that roller ?
Thank you. I'll turn a driver on the lathe to make sure I drive it straight, never- sieze the crank bore, & use a good moly lube on the needle bearings.
Just ran into the same problem with my 65 348 truck engine,ordered one from Show Cars for the 3 speed-4 speed set up and it was too big. Contacted them and was informed that it could be either of the three. For 9 bucks they are sending the other two so I know one will fit
Just ran into the same problem with my 65 348 truck engine,ordered one from Show Cars for the 3 speed-4 speed set up and it was too big. Contacted them and was informed that it could be either of the three. For 9 bucks they are sending the other two so I know one will fit
Group 0.649 BEARING, Crankshaft Clutch Pilot
55-62 ALL (except 322, 348, 409, DIESEL)
63-60 ALL (6 cyl.) (exept DIESEL)
64-66 Series 50 (283)................................(bush type) (19/32 O.D.x 3/4) 3752487
56-62 ALL (8 cyl.) (except 265, 283),
62-66 DIESEL (except 351, 478),
63-66ALL (8 cyl.) (except 283)...(ball type) (63/64 I.D.x 2- 3/64 O.D x 19/32) 904983
63-66 ALL (351, 478).....(ND 7109) (19/32 I.D. x 1 13/32 O.D. x 11/32) 907321
So it looks like the 348/409 truck cranks use a 63/64 ID x 2-3/64 OD x 19/32 ball bearing .
55-62 ALL (except 322, 348, 409, DIESEL)
63-60 ALL (6 cyl.) (exept DIESEL)
64-66 Series 50 (283)................................(bush type) (19/32 O.D.x 3/4) 3752487
56-62 ALL (8 cyl.) (except 265, 283),
62-66 DIESEL (except 351, 478),
63-66ALL (8 cyl.) (except 283)...(ball type) (63/64 I.D.x 2- 3/64 O.D x 19/32) 904983
63-66 ALL (351, 478).....(ND 7109) (19/32 I.D. x 1 13/32 O.D. x 11/32) 907321
So it looks like the 348/409 truck cranks use a 63/64 ID x 2-3/64 OD x 19/32 ball bearing .
My calipers are almost too short, but it measures approx. 1.060 where the pilot bushing would go and approx 1.692 where the hub of a torque converter would go. This short block came from one of the 80 series Janesville Transport trucks back in the 60's.
dean409
Well Known Member
Just came in from the garage with the same problem. 1965 truck block, never been apart, with a standard tranny. Always used roller pilots on my Mk IVs, bought one for the dubya. No fitty senor'. Thought the edge was a little ruff so put some emery to the edge. Dug the old pilot outta the trash and it's smaller. Heh? I grew up with the knowledge all olde Chebbies were the same! Okay, so what bushing/bearing do I use with my Muncie?
Buy the bronze bushing.