I recently acquired a set of 1970 (non-stage) heads to go with my 75 455 block. Is this a simple bolt-up, or will some modifications need to be done to make this work ?
they will bolt right on, you just can't use the steel shim gasket(it is for pound port blocks only 67-71)
Combination My '70 GS has '70 non-stage heads and a '75 block. It ran 12.20's at 110 mph at Bowling Green on Thursday. So, I guess you could say, "Yes, it works." I have been told that the '75 blocks are more substantial than the '70 blocks. Of course, the '70 heads will flow a lot better than later heads. Remember, '70 Stage I heads carried the same part number as the non-Stage I heads.
I wonder how the hell that could be. I tried to put 76 heads on my 68 430 in an act of desperation to get compression once, and I could only get four head bolts in. no matter what I did. It pissed me off to no end. I thought It was just an oil issue since the later blocks oiled through the rockers, while the earlier was through the rocker shafts. I assumed if I changed the pushrods rockers and lifters that would be fine, but the damn heads would no bolt on. WHY??????????????? but it goes the other other way around. it still bugs me
John Small valve heads huh? I,m runnung 71 heads on a 76 block and I'm told that's my limiting factor. If your running those numbers then why is the first modification everyone talk about is Stage One valves? Dave Berryo No: o No:
The casting numbers on these heads is 1382091,and the date stamp is e2 and d27. If anyone has access to Buick number lists, please let me know the correct date for them.:Comp:
Hi Mark - According to Atlanta Buick, those heads were off a 1968 big block (400/430) E2 - May 2, 1968 D27 - April 27, 1968
