.060 Cylinder Overbore Question

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  • #7133
    BruceM
    Participant

    I am rebuilding the engine on my ’62 Jetfire project and the block is at the machine shop. Apparently it had already been bored out .030 over and there is a pretty good ridge at the top of the cylinders. My machinist recommends that it be bored to .060 over. I can find pistons for it, but I am wondering if there is any risk to doing this while running it with a turbo. Are the cylinder sleeves too thin for some reason that could cause a problem? Anyone out there have any experience running a turbo on a .060 overbored engine? I’m probably going to have to go that route if a .040 overbore isn’t enough, and it isn’t sounding like it will work. So, any advice on this is appreciated.

    Bruce

    #7135
    kid442
    Participant

    Bruce,
    You need to contact Dan at D & D. He is an old friend for over 30 years and has worked on these engines for that time. Also work for GM for years. (http://www.aluminumv8.com/) I am sure he may not be the cheapest but he knows.
    Good Luck,
    Ken

    PS: email sent

    #7136
    kid442
    Participant

    Bruce,
    You need to contact Dan at D & D. He is an old friend for over 30 years and has worked on these engines for that time. Also work for GM for years. (http://www.aluminumv8.com/) I am sure he may not be the cheapest but he knows.
    Good Luck,
    Ken

    PS: email sent

    #7159
    62oldsf85
    Participant

    Bruce,
    I did a .030 overbore on mine. One of my cylinders was shot from a spun rod and piston shattering that got thrown through the block (no kidding). To prepare for sleeving that cylinder, we actually bored out .100 to remove the original cast sleeve. It looked like peeling a thick tin can. A .010 clean up can sometimes get rid of the rim ridge, but you would use a ridge reamer to do that and then look at the condition of the cylinder (the circumference of the ridge is actually smaller than the cylinder, so once you use the ridge reamer, you’re usually good up on top, it’s the middle and the bottom of the cylinder, the scoring in it, and the actual true roundness of it that they’ll measure to determine whether or not they need to take more out.

    Anyway, my experience with those cast sleeves is that they are pretty damn thick, and it takes a while to get to the water jacket. This engine does produce a lot of heat, but if your block’s water passages are cleaned well and your cooling system runs effectively, I think you could do a .060 over. I had my piston tops jet hot coated for heat resistance, you might consider that. It was pretty cheap (about $200 for all 8) and who knows, but I figured that was cheap insurance.

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