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BBR's 83GT - turbo 302.... now with EFI!

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  • Originally posted by BBR View Post
    Because 5 grams of aluminum is roughly 2 cubic centimeters. That would be a bunch of metal to remove from a piston!


    Means Valve Reliefs for increased stroke to make up for the lost material. or something like that.

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    • Originally posted by BBR View Post
      Because 5 grams of aluminum is roughly 2 cubic centimeters. That would be a bunch of metal to remove from a piston!

      According to Randy Malik, the factory balance for a 460 is plus or minus 42 grams on the bobweight!

      GM's was around 40 grams for V8's. A good machine shop can get the balance down to less than two grams.
      BS'er formally known as Rebeldryver

      Resident Instigator

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      • Pulled the main caps off yesterday. Crank and bearings look fantastic. I'm very happy to not have any surprises in the bottom end.
        Life is short. Be a do'er and not a shoulda done'er.
        1998 Mustang GT https://bangshift.com/forum/forum/ba...ix-to-4sixzero
        1983 Mustang GT 545/552/302/Turbo302 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
        1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
        1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

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        • I'm glad to hear that. I was wondering. When I was kissing the pistons the bottom end didn't show anything unusual, but yours was faaaar worse with actual failure.
          Escaped on a technicality.

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          • If you look at the hole drilled in the piston boss, that is your piston weight 'adjustment'. You could do four of those in each new piston, one on each boss and easily match the old piston weight and thus avoid the re-balance. I absolutely would mag the rods though, you may have read what happened to Jay Brown. I think he could have caught the incipient beam failure had the rods been magged before the latest re-assembly. Same goes for the crank. I pulled the Scat forged 4.5' arm out of a previous 588" build after that particular engines' roller lifter failure and we found radial cracks in one of the rod journals. Just my $.02.
            Drag Week 2006 & 2012 - Winner Street Race Big Block Naturally Aspirated - R/U 2007 Broke DW '05 and Drag Weekend '15 Coincidence?

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            • 10-4 I hear you loud and clear. I'd hate to rebuild only to splatter it again in short time.
              Life is short. Be a do'er and not a shoulda done'er.
              1998 Mustang GT https://bangshift.com/forum/forum/ba...ix-to-4sixzero
              1983 Mustang GT 545/552/302/Turbo302 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
              1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
              1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

              Comment


              • glad to see there's no obvious damage to the bottom end...here's hoping the news stays the same when you get them checked by the machine shop. Otherwise you may wind up looking at aftermarket blocks and a 588+ cu in build ... hmmm
                Rich

                Drag Week Survivor 2009, 2011, 2012, 2013 - 2nd Place - Pro Street N/A, 2017

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                • Back to the HEMI!!
                  Escaped on a technicality.

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                  • Happy early Bday to me! Finally bought a bore gauge! Not more snap gauges for me!
                    Attached Files
                    Life is short. Be a do'er and not a shoulda done'er.
                    1998 Mustang GT https://bangshift.com/forum/forum/ba...ix-to-4sixzero
                    1983 Mustang GT 545/552/302/Turbo302 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
                    1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
                    1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

                    Comment


                    • I've been lusting after one of those. Now I can just borrow yours! Is that a HF/Northern Tool or something even groovier?

                      Happy Early Birthday to YOU!!!!

                      Dan

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                      • Not HF/Northern Tool, but not far from them! It was 62 dollars or so on ebay. Not too expensive and soooooooooooooo much easier than snap gauges.
                        Life is short. Be a do'er and not a shoulda done'er.
                        1998 Mustang GT https://bangshift.com/forum/forum/ba...ix-to-4sixzero
                        1983 Mustang GT 545/552/302/Turbo302 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
                        1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
                        1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

                        Comment


                        • Remember that they're useful for all kinds of stuff besides cylinder bores. Like, bolt on the main caps and check if the bearing bores are straight, round, and to size. All kinds of stuff like that.

                          Dan

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                          • Can I borrow it?
                            Escaped on a technicality.

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                            • I have the same one - but it came in a black plastic case - LOVE it - as Dan says I use it for the cylinder bores, and to check all the bearing journal diameters. I got a set of 0-6" mechanical digital micrometers - so bearing clearance is easy, measure shaft OD, bearing ID and subtract - no more plastigage!
                              There's always something new to learn.

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                              • Zero the bore gauge in the mic, and read clearance directly
                                My fabulous web page

                                "If it don't go, chrome it!" --Stroker McGurk

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