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#1
Today, 01:13 AM
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GM aluminum 842 heads open chamber?
Has anyone seen a set of 842 big block aluminum heads that were open chamber design? I have to believe these have been modified? Alan Colvin's book says the 1968 and early 69's has a screw in plug on both ends and late '69 had a plug on only one end. These don't have a screw in plug on either end. The date looks like 7 15 69.
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70 Chevelle Vert L34 M21 28-A 791 70 Chevelle Cpe LS6 M40 14-14 756 70 Chevelle Cpe L?? M?? 926-99616 755 69 Chevelle Cpe L78 M21 71-B 756 70 Chevelle Cpe L34 M20 48-48 796 70 El Camino L34 M20 28-C 765 
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#2
Today, 02:52 AM
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They all came closed chamber from GM. I have had many sets that we opened up to the open chamber design.
Those also had the extra(ZL1) head bolt boss added to the underside. The later service heads had no plugs on either end. Jason Last edited by SuperNovaSS; Today at 02:54 AM.
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