Not a Mopar but ...AMC 360 on the Dyno

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RAMM

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This one was a fun project, haven't done an AMC in about 20years. Customer is a Jeep fanatic and wanted a good build with about 375hp. Customer supplied the cam and intake manifold and the core 360 of course. After doing some research on these and some measurements rotating assembly was decided on stock stroke with a Chev piston for a 377 build. It wound up @ 4.125" x 3.44" with a Chev size 6.250" Rod and the rod journals turned to .020" under SBC size. I was also asked to braze up the weird exhaust ports so they would match his header flange. SBC 2.055"/1.625" valves were used after installing 11/32" iron guides. Chose to use a Ford rocker arm system and had to machine the pedestals down .260" to get all of that .480" cam lift. Picked up flow 22cfm at all relevant lift points to 231-232 cfm @ .400-.500" . Had to machine the DSS forged piston tops in order to use the Felpro head gaskets. I had to figure out how to mount the customers bellhousing to the dyno which took a little head scratching and a few hours of machining. Turned out great though. Broke in the cam and made 12 tests. Surprised me with the torque for 368 cubes and 9.6 comp on 91 pumpfuel. Very pleased with the 14.5" of idle vacuum and the 40-70 psi oil. Sounded good and ran great. Should move his 4spd CJ6 nicely. J.Rob

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I should have milled a slot to capture the pedestal perfectly ticked at myself for thinking of it after the fact. J.Rob

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RAMM said:
This one was a fun project, haven't done an AMC in about 20years. Customer is a Jeep fanatic and wanted a good build with about 375hp. Customer supplied the cam and intake manifold and the core 360 of course. After doing some research on these and some measurements rotating assembly was decided on stock stroke with a Chev piston for a 377 build. It wound up @ 4.125" x 3.44" with a Chev size 6.250" Rod and the rod journals turned to .020" under SBC size. I was also asked to braze up the weird exhaust ports so they would match his header flange. SBC 2.055"/1.625" valves were used after installing 11/32" iron guides. Chose to use a Ford rocker arm system and had to machine the pedestals down .260" to get all of that .480" cam lift. Picked up flow 22cfm at all relevant lift points to 231-232 cfm @ .400-.500" . Had to machine the DSS forged piston tops in order to use the Felpro head gaskets. I had to figure out how to mount the customers bellhousing to the dyno which took a little head scratching and a few hours of machining. Turned out great though. Broke in the cam and made 12 tests. Surprised me with the torque for 368 cubes and 9.6 comp on 91 pumpfuel. Very pleased with the 14.5" of idle vacuum and the 40-70 psi oil. Sounded good and ran great. Should move his 4spd CJ6 nicely. J.Rob

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I had to do that to get a Chrysler bell housing on my dyno. Evidently they never did a Chrysler with it before we got it.
 
He wanted 375 and you gave him 419? He should be very happy with that. Nice engine for sure. Well done.
 
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Very nice flat fuel curve (curve?) on that carb. Who is your buddy that did the carb?
 
I would be very happy if the torque curve on my 400 build looked like that.
 
Nice work…. Finally something other than an imaginary 318 built
 
This guy is now retired I believe, but he has shown a few really cool builds. If interested, just look up some of his threads on IFSJA.

https://forums.ifsja.org/forum/tire-kickin/street-performance/2472880-amc360-stroker-397-cubes

When I took my 401 to be dynoed, we had to track down another header for one side, because the header I had wanted to be where one of the engine support legs was. The owner called around and found one on a Friday evening. If he had not, I would have been bummed after driving six hours to his shop. My effort appears to fall very short of yours, but that was the first engine I ever built. I would love to find someone fairly close that really knows AMC's to go through it and find some more in it.
 
Something different, and I love it. Your attention to detail is amazing, sir!
 
I hope that he had the oiling system modified as AMC's have a poor oiling system. The back half of the block will lack for oil over 5,000 rpm's, they been known to lose oil flow to the number 4 and 5 main bearing
 
AMCs have some badass heads pretty much stock. Nice work!
 
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