How To Swap A Gen III Into A '64-'72 A-Body - Part I
We popped the valve cover to get the number off the cylinder head. If you don't want to do that, the last four digits are stamped on the passenger-side front. This engine has 241 LS1 heads; 243 would indicate an LS6. LS1 heads also have an oval exhaust port instead of the LS6's D-shape. View Related Article
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