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How Much Can a Lopo Take?

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    #1

    How Much Can a Lopo Take?

    Out of curiosity; how much power can a lopo block take before it rips itself a new one?



    Packman
    Tags: None
    #2
    Don't take my opinion as true... but I think the lopo is identical to the HO besides the heads, cam, and intake. Like I said, I may be wrong or most likely wrong.
    '97 Cadillac Catera - 3.0 DOHC V6, 75k
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      #3
      What I meant is how much hp/tq can a lopo block take before it splits? Will a main bearing girdle help things? Just curious during this quiet day at work.


      Packman

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        #4
        From what I've heard, the lopo block is one of the stronger blocks to build up a 302 from...
        1984 Ford Crown Vic LTD, The Murphmobile (RIP)
        1985 Ford Crown Vic LTD, The Murph Deuce (SOLD)
        1978 Chevrolet Caprice Classic, The Crapiece (current project)

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          #5
          So with a decent bottom end build, a TrickFlow Street Burner engine kit, and whatever supporting mods, you think it will hold up?


          Packman

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            #6
            500+ hp is where you run into problems with the block not being able to handle it

            1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
            2006 Lincoln Town Car Signature. Stock for now
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              #7
              ~500hp the block quits at. If you had HO pistons, the bottom end will hold up to anything that the block will tolerate. Theres no need to fancy up the bottom end unless you plan on rpms over 6000 or so. Honestly I'd do any real build with an HO shortblock just for that reason, or replace the stock pistons and carry on.
              86 Lincoln Town Car (Galactica).
              5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

              91 Lincoln Mark VII LSC grandpa spec white and cranberry

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              Originally posted by phayzer5
              I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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                #8
                yep 500, at the wheels, thats about 575 at the flywheel

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                  #9
                  What about a stock 351 block? the f4 roller.

                  What can be done to strengthen the 302/351 Windsor blocks to take more? Or is it cheaper to just buy a performance block?

                  Just been wondering.
                  "Shakedown"- 1991 Grand Marquis GS Dual exhaust, Magnaflow xl turbos, Rear anti sway bar, Outlaw 1 wheels, 43k miles
                  1985 GMC 1500

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                    #10
                    stock 351 blocks will handle around 750 FLYwheel hp

                    the pre74 302 blocks are the strongest, then the mexican blocks; those will take aorund 650 FLYwheel

                    then 75-79 blocks are the next strongest

                    80-85 are the weakest


                    the only thing that you can really do beyond that is go aftermarket to DART etc.

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                      #11
                      these numbers are if you are staying under 6500 rpm

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                        #12
                        Originally posted by jayh View Post
                        stock 351 blocks will handle around 750 FLYwheel hp

                        the pre74 302 blocks are the strongest, then the mexican blocks; those will take aorund 650 FLYwheel

                        then 75-79 blocks are the next strongest

                        80-85 are the weakest


                        the only thing that you can really do beyond that is go aftermarket to DART etc.
                        Thanks.. The 351 I'm looking at is a stock block w/ stroke kit so I was just wondering. I doubt Ill hit the 700hp mark. My goal is 600hp at the fly.
                        "Shakedown"- 1991 Grand Marquis GS Dual exhaust, Magnaflow xl turbos, Rear anti sway bar, Outlaw 1 wheels, 43k miles
                        1985 GMC 1500

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                          #13
                          Originally posted by packman View Post
                          So with a decent bottom end build, a TrickFlow Street Burner engine kit, and whatever supporting mods, you think it will hold up?


                          Packman
                          this is actually what I am planning on doing, just find a 5.0 (doesn't matter which one), have it punched to 306 (piston problem solved), up the compression a bit, and run the Street Burner Engine kit.

                          In the end it should be about a 3k build, with netting close to 400hp-ish
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                            #14
                            I was thinking more along the lines of what to do with a lopo after a swap. 500rwhp and we're cleaning the sheets. Okay, nice tidbit of info. Thanks guys.



                            Packman

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                              #15
                              How Much Can a Lopo Take?

                              about 400-500hp just like the HO.. once you get into the 400hp range your pushing it.
                              Give a man a fish and he will be fed for a day. Teach a man to fish and he will promptly forget that he once did not know, and proceed to call anyone who asks, a n00b and flame them on the boards for being stupid.

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