Engine rebuild question
Have the original engine that came with my 65 mustang. It is currently at the shop. It is bored 0.040 over. I was going to have the engine bored 0.060 over and throw in some extras to pick up some added HP. I just received a call back from my mechanic who stated that the block needs a ton of work. The valve seats are original, so unless I wanted to be adding lead to my fuel all the time, they would have to be swapped out. The sleeves are hour glassed apparently. And there are scours pretty deep in one cylinder wall. The car is an A-code, which is not as coveted as K-code engines, but still rather sought after. A-code cars came stock with 289 4v. Anyway he says he can rebuild it for around $2200.00 but he made an effort to talk me into a built 289 that is fresh from tooling and ready to rock. He says it's a pretty nice motor. Should I rebuild my original block? Is there any benefit in retaining the original engine? Or am I just squeezing one last rebuild out of a motor for no reason. The car is basically all original, so I would like to keep its engine, but is there any real reason other then that. Would I be sacrificing any monetary value by putting in a different 289?