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The 98GT - 4pointsix to 4sixzero

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  • The 98GT - 4pointsix to 4sixzero

    With the 73 F100 and the 83GT both nearing "complete-ish" status (I know I just jinxed myself) I found myself perusing FB Marketplace every evening for a new project. I ran the gamut of different ideas, old cars, foreign cars, old foreign cars, Fox chassis cars, MN12's, etc, etc. The only real requirements were: 1.) cheap, 2.) titled, 3.) interesting to me, 4.) stuff I own can be used on it. The last one is a biggie because part of the goal is to mostly use stuff I already have, like BBF parts, C6/E4OD transmissions, etc. I really had been looking at a couple of different Lincoln Mark 7's that fit all of the criteria. But, for some reason I just couldn't quite bring myself to jump in. An ad popped up for a red SN95, that was partially disassembled, but otherwise fit the criteria very well. It was a GT so it had an 8.8, hydroboost and all the GT bells and whistles. I decided it was the one and Judd and I loaded up to go get it. Well, en route to get it, the guy messaged and said he just sold it. Nice. Thanks for the heads up dude.

    That night, I decide to look at Craigslist and ran across a dealer's ad in Fort Worth for a 1998 GT that was had the trans removed to attempt to fix some leaking freeze plugs. They were asking $1000. I clicked the "Make an offer" button and told them I would give them $800. Deal! I put a deposit on it and I will drive down to pick it up on Saturday.

    It is a 1998 dark green satin GT. Looks to be in very good condition for an $800 car. Both of my last two projects were in far worse shape when I bought them. Currently it is a 4.6L, with a T45 trans. The trans is included, but I won't be using it.

    Now, to the part everybody wants to know about. What are my plans for it?

    Park it under a car cover. Well for a little while, until I open up a slot at the shop. Then I will set out pulling the 4.6 and getting everything cleaned up and sorted out.

    Then the hope is that one of my 460's/C6/E4OD will find it's way under the hood with power steering, and air conditioning and if I play my cards right, running on the 4.6's MAF EEC-V ECM with the stock EDIS. Really the only two inputs I need to add are crank and cam position sensors and I have really good ideas for both. Right now I am thinking the '96 shortblock, re-ringed and with new bearings and gaskets and a set of D3 heads, if I do not stumble upon some D0VE's for next to nothing. The '96 EFI intake *can* work with the old heads, but not vice versa. Plus, my Hooker headers fit the old style heads. If the efi proves to be a flop, I can always plop a carb on it and go from there. Cam will likely be a flat tappet hydraulic, semi-lumpy, stock valve train components will be used.

    The mod motor k-member is wrong for the BBF swap mounts I have, but I also have a BBF motor plate. The motor plate is steel so it should be fairly easy to create a power steering pump bracket and AC compressor bracket near the stock 4.6L locations. I will attempt to use the idlers and tensioner from the 4.6 to create my own "serpentine" belt routing. I have a Meziere electric water pump to handle the coolant pumping duties so I don't have to deal with spinning a pump.

    Chassis-wise, the stock stuff will stay in place. Sway bars, quadshocks, stock control arms, etc will all go untouched. I will probably lower it and do some different wheels. Maybe a 17" front skinny and a beefy-ish 15" drag radial on the rear, but that will be some time down the road.

    I want the big block Mustang Ford should have made in 1998!

    Pics from the ad.

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    Last edited by BBR; August 26, 2020, 01:08 PM.
    Teddyzee likes this.
    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

  • #2
    it's perfect... just tell me the cow is in the back and the gate is closed.
    Flying south, with a flock of bird dogs.

    Comment


    • #3
      Looks like fun, miss you BBF mustang?
      http://www.bangshift.com/forum/forum...-consolidation

      Comment


      • #4
        I do, but I want this one to be different. A second chance car to do stuff I thought of doing with the 83GT, but felt like I had already gone too far to go back. A bit more refined and user friendly if you will. It won't be near as fast, but should be a lot of fun to drive.
        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


        • #5
          Time to update the signature line again. Looks like good bones.
          Of all the paths you take in life - make sure a few of them are dirt.

          Comment


          • #6
            Sounds like fun. I am starting to like refined. I cringe when I see people gut street cars. I have alot of fun in my slow car. If you want to go faster add more power.

            Last year on Dragweek I pulled up beside another car to ask directions. I cranked down the window and asked. Then the sweaty guy asked me "you have A/C in that?" YES!
            http://www.bangshift.com/forum/forum...-consolidation

            Comment


            • #7
              Like anybody asked, but here's what I'm wondering. 4 barrel throttle body, lose the snake, close the stock hood? Nobody would see that coming.

              I could live with 2500 rpm at 70 maybe, if it had 2.73's that's about where it'd be with the C6... of course, that'd be closer to 100 mph with the E4OD. lol. You know all this, I'm just chattering. What gear does it have?

              /edit - I re-read and missed. It's a '98, probably has 3.27's... bit much for a C6 for me to use in the same sentence with civilized. If there's a spare MS-2 around there, M-Shift firmware? From what I've been gathering you can share most of the signals.
              Last edited by Beagle; August 27, 2020, 06:02 AM.
              Flying south, with a flock of bird dogs.

              Comment


              • #8
                It will either have 3.08 or 3.27's. 3.27's would be nice and I would be fine with 3.55's or maybe 3.73's depending upon rear tire size.

                EDIT: What I am reading shows manual cars to be 3.08's. No biggie. Gears are easy-ish to change should I want to.

                The current line of thinking is making an adapter plate to bolt the stock 4.6L plenum and TB to the 460 EFI intake. That way, everything fits like Ford intended and I don't have to jack with a bunch of extra stuff. And it *might* fit under a stock hood..... There are plenty of aftermarket options to improve on the stock plenum and TB if I choose to do so later.

                Last edited by BBR; August 27, 2020, 06:39 AM.
                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


                • #9
                  I hadn't considered the 4.6 TB and elbow. That's a good idea. My '98 had 3.27's but they were optional. Really not a big deal for a big inch not-a-race-car. The 4.6 was tall and wide as I remember it... 460 may give you more room to work. lol.
                  Flying south, with a flock of bird dogs.

                  Comment


                  • #10
                    honest question - D0VE's would put that right around 11:1 ... question is, will that be okay with 93 octane? I know you guys are 3000 something feet higher elevation than down here, but still it's making me wonder. I gave a few minutes thought to the same thing with E85 and decided changing all the fuel system out was more than I wanted to do.
                    Last edited by Beagle; August 27, 2020, 05:36 PM.
                    Flying south, with a flock of bird dogs.

                    Comment


                    • #11
                      Yikes I wasn't thinking it would be quite that high.

                      11:1 would be pushing your luck on pump gas with a smallish cam in my opinion.
                      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


                      • #12
                        11:1 with the tight stack up with a 4.5 x .039 gasket, 72cc head, 12cc dish, .002 deck height. Felpro won't commit, says .039 - .048 compressed. Really nice fellas, thanks.

                        ~10.4:1 On the loose side, 4.6 x .048 gasket, 74cc head, 13 cc dish ( I see 12-13 quoted), .002 deck

                        I had wondered about unshrouding the valves and a deeper / wider cut for the valve reliefs for the "loose" side, but the quench starts going away with that gasket. One of these days I'll spend time making money instead of worrying an excel spreadsheet to death. lol. Stuff makes me nuts. It's easier to control compression with a stroker kit than Ford's head extremes.

                        If I had to guess, you'll pick something like the XE274 (230/[email protected]) for a cam. The D3's milled to 88cc will be right at 9.5:1 which I would think should be in that cams sweet spot? Just thinking out loud..

                        I don't remember you ever having problems with the motor plate? Other than maybe some vibration, are there other serious downsides?
                        Last edited by Beagle; August 28, 2020, 05:26 AM.
                        Flying south, with a flock of bird dogs.

                        Comment


                        • #13
                          Good to know. I haven't really looked into all this in depth just yet.

                          That is probably about right for the cam. Again, I haven't thought about it a whole lot just yet. That will come when I check out the internal condition of my '96 EFI motor.

                          The motor plate was ok. It sure made putting the engine and trans in easy. It was a bit more vibratey (new word) than the rubber mounts and my sheeting shaft in the 83 rubbed on the headers because I dropped the engine a little lower when I installed it. I have considered making rubber mounts for the plate this time. Something simple but would provide a little insulation from vibration. Then again, this car is probably 5000% better in the NVH department than an 83 fox body. lol
                          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


                          • #14
                            Stashing this link here. I feel like this guy and the associated forum are going to be a major key in making the efi portion of this project work.

                            http://www.efidynotuning.com/
                            Last edited by BBR; August 28, 2020, 02:21 PM.
                            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


                            • #15
                              Originally posted by BBR View Post
                              Stashing this link here. I feel like this guy and the associated forum are going to be a major key in making the efi portion of this project work.

                              http://www.efidynotuning.com/
                              Decipha is quite active on eectuning.org as well.

                              What an ironic, or fitting, middle name!
                              Last edited by Beagle; August 29, 2020, 06:00 AM.
                              Flying south, with a flock of bird dogs.

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