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77K10Silverado · 07-11-2014, 04:10 PM

Little help here.. I plan to pull my original 350 4bbl from my 1977 K10 for a rebuild but was curious what type of crankshaft came factory. Cast iron or steel? So far I was able to get 010 off the side of the block which tells me its a 4 bolt main. If I need to get more numbers I can. Any help would be appreciated!

07-11-2014, 04:10 PM	#1
77K10Silverado Registered User Join Date: Jul 2014 Location: Winston-Salem, NC Posts: 561	Cast Iron or Steel? Little help here.. I plan to pull my original 350 4bbl from my 1977 K10 for a rebuild but was curious what type of crankshaft came factory. Cast iron or steel? So far I was able to get 010 off the side of the block which tells me its a 4 bolt main. If I need to get more numbers I can. Any help would be appreciated!