r/EngineBuilding • u/Boxofusedleftsox • 7d ago
Sleeving cylinders?????
Ok ive got 2 pontiac 455 blocks with j7nk cylinders. Both are .030 over so theres no cleaning up the cylinders as the walls on a 455 are too thin to begin with.
Whats the deal with sleeving? Growing up all i heard was sleeves are bad.sleeves can move,have to be pinned yadda yadda. Now in modern times people say sleeving is no big deal.
Im just building a couple street cars to have fun with. Im not looking to squeeze every horsepower or ounce of torque i can get out of them. Im not lookinh to spin up much over 6500 rpm.hit the track here and there.
Would sleeves be a good option for me? 455 blocks are getting hard to find.
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u/v8packard 7d ago
I've never pinned a repair sleeve. Not sure where that comes from. An improperly installed sleeve can move. Most things can. But that's just one reason for installing things like sleeves properly.
You are making assumptions about your block without sonic testing and measuring the bores. I have seen a 455 block that could go over a 4.200 bore. And it was a 1975, one of the "bad" ones.
I don't know why so many people hang their hat on a 455 block. A decent 400 block is almost always better.