Hello- This is my first post here. I have a 64 1/2 mustang with a 68 289 in it. The previous owner said that he had the engine rebuilt from the bottom up by an experienced engine builder. I was taking the plugs out in preparation to replace the exhaust manifold with some new headers. In doing so, I found that the left head has small plugs and smaller plug holes than the left side of the engine. It has autolite plugs with the larger ones #45 and smaller ones #25. According to the parts store the 45's were the correct plug for that engine.
I pulled the valve covers off and the driver side head is stamped 302, the passenger side head is stamped 289. The engine starts up and appears to run real nice. Will this setup cause any problems down the road? Should I just replace one of the heads with a matching head. If so which one should I go with?
Thanks a bunch!
Jim
I pulled the valve covers off and the driver side head is stamped 302, the passenger side head is stamped 289. The engine starts up and appears to run real nice. Will this setup cause any problems down the road? Should I just replace one of the heads with a matching head. If so which one should I go with?
Thanks a bunch!
Jim