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J10 headers? For 3in exhaust? |
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amc401t10
AMC Addicted Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Posted: May/09/2020 at 10:43am |
I crashed my hot rod, gremlin x, 550 hp 401. Putting the 401 in my 82 j10.
Gotta have 3in exhaust! My long tube headmans exit so close to frame and Tranny, I don't think they can fab 3in to attach? Was thinking shorty headers might work? Anyone got 3in, or even 2.5 in duals from headers? My current 360 exits through 2in. Dumps in front of rear wheels. Help? |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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BrotherBamc
Supporter of TheAMCForum Joined: Jan/22/2009 Location: Lewiston Status: Offline Points: 2248 |
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You shouldn't have any problems with a 3 inch exhaust on your J-10. I think it all depends on the skill level of your exhaust guy.
I just had 2 1/2" pipe from collector all the way back in my Gremlin. We did have to cut part of the bolt on collector off to get the 2 1/2" pipe to hook up, but my exhaust guy did it. |
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amc401t10
AMC Addicted Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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I went from 2.5in to 3 in on my gremlin, couldn't get over rear end, so turned down in
front of rear.felt like another 100 HP above 4000 rpm! But damn it was loud! On the j10 the collector exits right by the frame rail and crossmember . Theirs wires and fuel and brake Lines in their. The 2in fits with only limited clearence on each side. I thought maybe with the shorty header I could go under the crossmember? Ps what powers that gremlin?
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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BrotherBamc
Supporter of TheAMCForum Joined: Jan/22/2009 Location: Lewiston Status: Offline Points: 2248 |
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I consider it a mildly built 401.
.30 over, comp 280ish cam, speedpro 27 dished forged pistons, moly rings, 750 double pump Holley, stock 993 heads, Mallory unilite, MSD 6al ignition box, Comp cam roller rockers, hooker super comp headers, RobbMc mechanical fuel pump and an old school, carb cooking, torker intake with a 1 inch spacer.. |
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BrotherBamc
Supporter of TheAMCForum Joined: Jan/22/2009 Location: Lewiston Status: Offline Points: 2248 |
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amc401t10
AMC Addicted Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Makes me miss mine, it was my 1st car, 74 X with 304.
10 years later it was a 401, T10, 3.73 12 bolt. 500 HP It was a hand full! Only AMC in my area that got respect. I'd run anything! Got beat a few times. But surprised a Whole lot of other brands! The good old days!
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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fastjeep
AMC Fan Joined: May/22/2011 Location: York PA Status: Offline Points: 23 |
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Have a 86 J10 with the shorty headers ,i made a 2.5 Y pipe to right side. Used a Flowmaster 2.5 to 3 merge pipe then ran 3 from there. With flowmaster muffler it sounds good. We in PA there always threating to go after modified exhaust ( all the coal burners and their stacks ) this looks like stock pipe. I know since put on Fitech injection it really sounds good. Used the early left side header with rear exit and with 4" lift no clearence problems with drivers drop pumpkin.
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Jmerican
AMC Addicted Joined: Mar/29/2016 Location: Seattle, Wa Status: Offline Points: 585 |
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The exact parts fastjeep is describing make for an excellent FSJ 360 exhaust, with all mandrel bent pieces of course. The collector is a key piece.
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amc401t10
AMC Addicted Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Fastjeep, got any pics.
I've benn looking under mine, (I need the long tube(ceramic coated) headers to take advantage of the 500hp), I'm thinking 2.5 to mufflers then 3 out? Their might be room for 2.5 above the crossmember, 1 down ea side, if I move my wires, if not room, I'll run the Dr side over and down the pass side . Pilenty of room on pass side. Again , I drove this engine in my car with 2.5, turbo mufflers, and thought it was awesome! Then went to 3in, with flowmasters, felt like another 100hp, above 3500 rpm! Thanks for all the ideas!
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3529 |
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Felt like another 100 horse or at least sounded like it?
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