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Can anyone tell me what kinda 350 I have?
I was given a 350 from a friend, he said he thought it was out of a 70's blazer?? I took the oil pan off, and discovered its a 4 bolt main block, yay!! the only numbers I can find are around the cam hole in the front. top right, 512. top left, 010. bottom right G32, bottom left, 776 and 509. it has a .010. 9 on the side, and a 40 over where the fuel pump goes. The head serial number is 3888338. does that make any sense??
This link might help. MorTec
Well, you know it's a four bolt Chevy. Now go to the belhousing area, on the drivers side, on the belhousing part of the block, there will be a CAST in number, usually seven digits. Go to Mortec and it will list the approximate years the block was used.
338 heads were used from 71-76.
Are 338 heads any good as far as hi performance?
Just average heads. MOST, if not all, are for the old leaded gas and need hard seats installed. You would be better off with aftermkt heads.