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Unread 02-26-2014, 09:46 AM   #1
tdkask
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AMC 360 ratings

I have a AMC 360 from a rusted out junkyard '74 J10 that I will be swapping into my '80 CJ7. It is a 2bbl version.

Everything I'm reading says it's at around 175 hp, down over 25% from a couple years before. I assume that's a difference in net vs gross measurements, but wonder if there are other significant differences? Could I expect to see 230-240hp at the flywheel on this one in stock form?

Also, I have seen the 4bbl version is about 40-50 hp more. Does this seem reasonable? Is it reasonable to think I could swap to 4bbl intake and carb, add a little cam, and expect to see 275-300 hp at the flywheel?

Also, assuming the standard "RV cam", what would be expected for torque?

I don't need a racetrack monster, but I'm frustrated with my 258 and want to go to more power and bigger tires, so need to start thinking about what gear ratio I'll need to compensate (obviously I need a little less gear with more hp).

Thanks for any input.

Edit: Additional info, I will be using a HEI style controlled distributor and TFI style coil, so will have slightly more spark. I will also run no emissions, and no CAT. Exhaust will be stock cast manifolds into 2.25 dual exhaust all the way back, w/ very free flowing mufflers.

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Unread 02-26-2014, 11:21 AM   #2
strvger01
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what axle gears do you have now? it may be a gear swap might help. also, be aware that it was 1977 when these trucks got an upgrade in heavier axles and tubes. might want to double check what you have there so you don't destroy them with too much hp/tq.
this might help:
http://en.wikipedia.org/wiki/AMC_V8_engine
your engine:
2bbl/170hp,
4bbl/195hp,
4bbl+dual exhausts/220hp
i suppose if you rebuild the engine, bore and stroke it, cam kit, port the manifolds (both intake and exhaust), headers and a better carb and you might get what you're after.
or, you could just swap in a sbc 383 crate engine and call it good.
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Unread 02-26-2014, 11:38 AM   #3
tdkask
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I was referencing that wiki in the original post. I'm asking if the difference in numbers I'm seeing is just because of net vs gross ratings? Also, can those numbers be matched or beaten by a aftermarket intKe, carb, and cam only? Also, how does an aftermarket intake, carb, and cam (i.e. edelbrock) compare to a factory 4bbl setup?
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'80 CJ7__258, TF999, D300__'86 CJ WT D44/D30's(3.54s)__GPF custom front/rear bumpers
4" springs__33x15s on black steelies__Galaxy DX959 CB__Cage (built onto YJ "family" bar)
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Unread 02-26-2014, 12:09 PM   #4
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Yes the difference is net vs. gross.

Any matched intake/cam/exhaust is going to make a noticable improvement over stock.

There are a number of good 360 (and 401s which have applicable build theory) builds documented on the CJ forum.
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Unread 02-26-2014, 06:30 PM   #5
tdkask
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I understand that a aftermarket cam, 4bbl intake and carb will be significantly better than what's on there now stock. Will they be significantly better than a factory 4bbl intake/carb? Obviously I'll need a new cam because it would be unreasonable to think I'll stumble across a original out of a 4bbl engine that is in good shape. However, intakes can be found for $50-$75. Holley 600's are everywhere cheap. Is that comparable to a aftermarket 4bbl intake?

As for documented builds, I can find guys running stock setups and guys running setups with lots of shiny new bling parts. I want to know how much I can squeeze out if a small budget.

BTW, a 383 SBC is not in my budget. The 360 was cheap and bolts right up. I'd spend more on adapters to swap in a SBC than I paid for this engine. Thanks for the suggestion, though.
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'80 CJ7__258, TF999, D300__'86 CJ WT D44/D30's(3.54s)__GPF custom front/rear bumpers
4" springs__33x15s on black steelies__Galaxy DX959 CB__Cage (built onto YJ "family" bar)
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Unread 02-26-2014, 06:50 PM   #6
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The Edel 2131 will flow much better than the stock spread bore intake (plus you'll lose about 30lbs). I upgraded mine incrementally, ignition (small gain), cam, lifters, valve springs (decent gain), the intake and carb woke it up substantially, exhaust (little gain). The stock exhaust manifolds flow rather well. Study up on dialing in your cam (I'm not sure of the stock degree of 74, I do know that by 1980 the cam timing had been retarded by 13 effectively reducing combustible flow=less boom)
I have been quite pleased with the performance of my 160k mile motor since.
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Unread 02-27-2014, 05:06 AM   #7
tdkask
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Somehow I managed to forget for a minute that new cam would mean new springs. I hate to pull the head, but also hate to swap springs with the heads still on. Oh well... gotta suck it up and deal.
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'80 CJ7__258, TF999, D300__'86 CJ WT D44/D30's(3.54s)__GPF custom front/rear bumpers
4" springs__33x15s on black steelies__Galaxy DX959 CB__Cage (built onto YJ "family" bar)
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Unread 02-27-2014, 07:23 AM   #8
super98lsc
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When you pull the head hunt down a thinner head gasket and have the guides/valves/seals done. Small bump in compression & better quench wont hurt.
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00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 02-27-2014, 07:47 AM   #9
tdkask
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What's the clearance to valves? If I did all that then maybe just have them shaved and dish piston a little?
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'80 CJ7__258, TF999, D300__'86 CJ WT D44/D30's(3.54s)__GPF custom front/rear bumpers
4" springs__33x15s on black steelies__Galaxy DX959 CB__Cage (built onto YJ "family" bar)
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Unread 02-27-2014, 08:23 AM   #10
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Quote:
Originally Posted by tdkask View Post
I understand that a aftermarket cam, 4bbl intake and carb will be significantly better than what's on there now stock. Will they be significantly better than a factory 4bbl intake/carb?
Yes. When I said stock I didn't necessarily mean what intake/carb yours has. I meant any stock configuration whether it's 2bbl or 4bbl.
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Unread 02-28-2014, 10:11 AM   #11
super98lsc
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Milling the heads for compression will not yield much. The only way to make a large change in chamber volume and thus the CR is to angle mill the heads which will create intake fitment issues etc. Best option is to change the pistons to a higher compression unit and zero deck the block and have the heads milled flat to get a good seal. My 401 stock had the pistons -.012 in the hole. With the new pistons we will mill the deck to zero and use an .036 compressed gasket to get a tighter quench.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 02-28-2014, 03:57 PM   #12
tdkask
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I think that I'll have to do some homework and just wait a bit. For now I will leave it stock and just go. Eventually I'll run across a cheap intake and carb used, either stock or aftermarket. Either way it's bound to be way better than my tired 258.

As for everything else, I will be running my R32H-E (like a TF999, but with electronically controlled lock up converter) my D300, and my D30/D44 combo. I will be swapping in a full width HPD44 and Ford 9".
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'80 CJ7__258, TF999, D300__'86 CJ WT D44/D30's(3.54s)__GPF custom front/rear bumpers
4" springs__33x15s on black steelies__Galaxy DX959 CB__Cage (built onto YJ "family" bar)
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Unread 02-28-2014, 04:18 PM   #13
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Are you swapping the HPD44 to be passenger drop to work with the D300?
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Unread 02-28-2014, 04:25 PM   #14
tdkask
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I already did. Basically I found two with the " tubes. I removed the inner "C"s. I cut the long tube down to the same length as short tube and I cut the short tube out. Then I cut the housing away from the long tube from second axle and pressed (BFH) it in and welded. Worked great. Reset "C" angles.
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'80 CJ7__258, TF999, D300__'86 CJ WT D44/D30's(3.54s)__GPF custom front/rear bumpers
4" springs__33x15s on black steelies__Galaxy DX959 CB__Cage (built onto YJ "family" bar)
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Unread 02-28-2014, 06:38 PM   #15
super98lsc
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Nice work. You will enjoy the tq from the 360. Doing the cam and lifter/intake and carb swap will wake it up quite a bit, just be conservative on the cam choice as the low static compression will kill your torque and response under 3k. You can always run the numbers with a dynamic compression calculator online. I find good luck with a few iron headed builds now around 8.7:1 dynamic with a 9.8-10:1 static and not had any detonation issues in hot Texas summers. But that's running 93 octane.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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