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  • bore size of a Gen V BBC

    What's the largest overbore you can do on a Gen V block? I read an article that implied 4.5 bore size..... but I'd rather something more concrete then an implication.
    It only takes one aweshit to erase a dozen attaboys

  • #2

    Re: bore size of a Gen V BBC

    Re: bore size of a Gen V BBC

    Stock is 4.47" and you should be able to go 0.090" without a problem.. (4.560") Maybe even 0.125" with a sonic check.

    Comment


    • #3

      Re: bore size of a Gen V BBC

      Re: bore size of a Gen V BBC

      I thought stock 454 gen v was 4.25 with a 4.00 stroke.?
      It only takes one aweshit to erase a dozen attaboys

      Comment


      • #4

        Re: bore size of a Gen V BBC

        Re: bore size of a Gen V BBC

        I thought stock 454 gen v was 4.25 with a 4.00 stroke.?
        but what is the bore of a 502?

        Comment


        • #5

          Re: bore size of a Gen V BBC

          Re: bore size of a Gen V BBC

          I thought stock 454 gen v was 4.25 with a 4.00 stroke.?
          but what is the bore of a 502?
          thus the essence of my question - can you bore a gen V 454 to the 502 bore (4.47)?
          It only takes one aweshit to erase a dozen attaboys

          Comment


          • #6

            Re: bore size of a Gen V BBC

            Re: bore size of a Gen V BBC

            You never mentioned cubes and I simply assumed a 502 when you were talking a 4.5" bore.

            Yes, a 454 is a 4.25" bore and no, it can't go to 4.5" because it's bores are not siamesed like the 4.47" bore blocks.

            Comment


            • #7

              Re: bore size of a Gen V BBC

              Re: bore size of a Gen V BBC

              thanks - so there are two different versions of the Gen V block..... how does one tell them apart?
              It only takes one aweshit to erase a dozen attaboys

              Comment


              • #8

                Re: bore size of a Gen V BBC

                Re: bore size of a Gen V BBC

                thanks - so there are two different versions of the Gen V block..... how does one tell them apart?
                pull a core plug and look for water jackets aroung the cyl..
                if saimeced(sp?) it should go to at least the 502 bore size

                Comment


                • #9

                  Re: bore size of a Gen V BBC

                  Re: bore size of a Gen V BBC

                  Casting numbers..
                  You'll need to Google for a list of what's what..

                  If you're buying, see if you can get your hands on a BowTie block. They are 4.25" bore (one is a 4.125") that can all go to 4.6".

                  Also, good idea urwurznitmahre.

                  Comment


                  • #10

                    Re: bore size of a Gen V BBC

                    Re: bore size of a Gen V BBC

                    My understanding of the V gen bbc is that its only difference was the fact that it has no provision for a mechanical fuel pump and the VI bbc then went back to having the fuel pump provision.

                    And the only true way to know the thickness is the sonic test.
                    Keep smiling,makes them wonder whats on your mind.

                    Comment


                    • #11

                      Re: bore size of a Gen V BBC

                      Re: bore size of a Gen V BBC

                      Am I correct in the fact that the 502 and 454
                      have two different deck heights?

                      Comment


                      • #12

                        Re: bore size of a Gen V BBC

                        Re: bore size of a Gen V BBC

                        My understanding of the V gen bbc is that its only difference was the fact that it has no provision for a mechanical fuel pump and the VI bbc then went back to having the fuel pump provision.
                        ...and a 1 piece rear main seal.

                        Min. No.. The 454 and 502 are both 9.8". Tall decks (10.2") was available in BowTie and standard on truck applications.

                        Also, correction. The 502 has a 4.466" bore and not 4.47" as previously mentioned.

                        Comment


                        • #13

                          Re: bore size of a Gen V BBC

                          Re: bore size of a Gen V BBC

                          Thanks for straightening that up... ;)

                          Comment


                          • #14

                            Re: bore size of a Gen V BBC

                            Re: bore size of a Gen V BBC

                            Thanks for straightening that up... ;)
                            It's not that easy to find definite information. Much of Google just has casting numbers, deck height and CI.

                            And the books I have aren't very specific..

                            Comment


                            • #15

                              Re: bore size of a Gen V BBC

                              Re: bore size of a Gen V BBC

                              Thanks for straightening that up... ;)
                              It's not that easy to find definite information. Much of Google just has casting numbers, deck height and CI.

                              And the books I have aren't very specific..
                              thanks for the info - I googled and failed before I posted my question.....
                              It only takes one aweshit to erase a dozen attaboys

                              Comment


                              • #16

                                Re: bore size of a Gen V BBC

                                Re: bore size of a Gen V BBC

                                Am I correct in the fact that the 502 and 454
                                have two different deck heights?
                                not that I know of.

                                My fabulous web page

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

                                Comment


                                • #17

                                  Re: bore size of a Gen V BBC

                                  Re: bore size of a Gen V BBC

                                  Am I correct in the fact that the 502 and 454
                                  have two different deck heights?
                                  not that I know of.
                                  It's the 572 that's a tall deck.
                                  sigpic

                                  Comment


                                  • #18

                                    Re: bore size of a Gen V BBC

                                    Re: bore size of a Gen V BBC

                                    The 572 is only available in a 10.2" deck height.
                                    All other Mk IV, Gen V & Gen VI is an option of either 9.8" or 10.2". 9.8" being standard and 10.2" for truck applications.
                                    This was because truck pistions had 3 compression rings and their pistons had additional compression height.
                                    That's old and out-dated technology now, but the tall deck is a benifit for longer rods and/or stroker cranks.

                                    Comment


                                    • #19

                                      Re: bore size of a Gen V BBC

                                      Re: bore size of a Gen V BBC

                                      continuing in my lack of knowledge - I thought 454/502s were only put in trucks after the 70s?
                                      It only takes one aweshit to erase a dozen attaboys

                                      Comment


                                      • #20

                                        Re: bore size of a Gen V BBC

                                        Re: bore size of a Gen V BBC

                                        454 was available in light trucks starting in 1973. 502 was never installed in anything, it was only a crate motor. 496 (8100) was used in trucks in the early 2000s

                                        366 and 427 tall deck truck motors were available for a few decades, in medium trucks
                                        My fabulous web page

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

                                        Comment

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