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Thread: ? about milling 241 heads PTV clearance

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  1. #1
    Join Date
    Apr 2006
    Location
    Bellevue, Nebraska
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    ? about milling 241 heads PTV clearance

    So, I'm going with 241's for my Iron 5.7 build and I'm planning on getting them milled to raise compression. My question is how much should I get them milled without worrying about PTV clearance. I'm going to use flat top LS1 pistons. My cam is a TR 220 .551 lift with 7.425 pushrods. I'm thinking that .028 will not cause a problem and should take my chamber down to just under 63 cc's (.007 mill=1cc?). If the compression calculator I was using is correct, this should bring my compression up to 10.6:1.
    3.898 bore, 3.622 stroke, 62.67 cc chamber, flat top pistons, 0-.2 deck clearance, .045" head gasket.

    Does all this sound like it will work together?

  2. #2
    Join Date
    Apr 2008
    Location
    Birmingham, AL
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    3,626
    with that baby cam you wont have a thing to worry about
    01 Silverado

  3. #3
    Join Date
    Dec 2009
    Location
    houston tx
    Posts
    195
    i would definitely look into getting a bigger cam but u can mill at least .040 and still be safe i have a complete set of ls1 piston and rods for sale with piston rings 225 shipped to your door

  4. #4
    Join Date
    Dec 2008
    Location
    South Carolina
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    794
    ya thats a pretty small cam for a 5.7...im running a ls1 with forged flat tops 230 dur .600 lift cam with 243s milled .015" and havent had any problems
    2008 GMC Sierra SLE....370ci LY6 with some goodies SOLD
    1995 C2500- LS1 swap with a mp112
    build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html

  5. #5
    Join Date
    Apr 2006
    Location
    Bellevue, Nebraska
    Posts
    1,304
    I know that this cam is small for the 5.7, but it's what I have to work with due to fund restraints. That will be one of the first things I change when funds get right. After cam swap is going to be forged pistons.
    KHA, thanks bud, but I got a set for $100 on the way. Looks like this rebuild is only going to cost around $800.

    Thanks for all the inputs. Gonna finish tearing down the block tomorrow and take it to the shop on Tues.

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