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Welcome. Your post title asks about casting numbers. Is there a question in there?
sorry new to posting. Thought the pictures upload. Just edit the post. Could you help me ask least identify what year the motor was built? Allso is the #6 heads a good stock heads?
Yes, that's a 1970 block and the #6 heads are also consistent with a 1970 motor. Stock CR should be 10.25:1 unless it's a 2bbl motor, which would be 9.00:1.
What are your goals for the build? Where are you located? Either the Speedpro 6cc forged pistons or the Mahle Mahle 10cc piston is your best choice. Yes, the #6 heads are good but can be improved with W31 valves and porting. Cutlassefi on here, Mark Remmel has brought the Mahle pistons and many new parts for the Olds V8 to the market. Contact him, good guy to deal with.
Last edited by olds 307 and 403; Feb 3, 2020 at 03:32 PM.
