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**THI** · 03-26-2020, 09:58 AM

Correct on the 400 SBC not being offered in the 1970-1972 trucks, the 400 listed when looking for parts is a 402 BBC. I am not sure of the exact year they started showing up in square bodies, I thought is was 1973 but looking around I can only find them showing up in the 1975 year model and later.

Any of the 400's I have pulled out of the trucks, my experience is with 1977 and 1978 trucks that had original 400's, they had a small valve (1.72 intake, 1.5 exhaust) heavy casting head. The ones I have pulled out of mid 1970 cars had 882's - the first generation of the light weight heads. 624's were even lighter and more crack prone than 882's but I have only found those on 350's.

03-26-2020, 09:58 AM	#19
THI Active Member Join Date: Jan 2017 Location: Traverse City, MI Posts: 169	Re: Small block 400's??? Correct on the 400 SBC not being offered in the 1970-1972 trucks, the 400 listed when looking for parts is a 402 BBC. I am not sure of the exact year they started showing up in square bodies, I thought is was 1973 but looking around I can only find them showing up in the 1975 year model and later. Any of the 400's I have pulled out of the trucks, my experience is with 1977 and 1978 trucks that had original 400's, they had a small valve (1.72 intake, 1.5 exhaust) heavy casting head. The ones I have pulled out of mid 1970 cars had 882's - the first generation of the light weight heads. 624's were even lighter and more crack prone than 882's but I have only found those on 350's.