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#15
22-03-09, 02:43
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216 main bearings
Andrew as Mike stated earlier the original main bearings were supplied for either line boring or hand scraping ( two different pt/numbers )
Here are some pt /no's for std mains . Blitz Parts book ( for hand reaming ) Front main 604003 Front int 604004 Rear int 604006 Rear 604535 Nasco ( precision finish ) F 3847064 FI 3847201 RI 3847606 R 3847068 ( 40/47 ) 3847067 ( 37/39 ) Repco ( sets for domed piston engines ) 1937/39 4M9559 1940 4M9979 It appears that the front 3 mains went right up to 1947 but the back main kept changing hence the different sets. When ordering check the width of the rear main . I have several sets of GMC mains , I will cross reference the numbers to see if they match. Regards Jim S.
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jim sewell cmp and cckw Last edited by jim sewell; 22-03-09 at 02:57. 
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