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Old 01-16-2018, 06:36 PM   #1
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ATK Gen3 392 stroker short block

Curious if anyone has seen or used one of these 392 short blocks from ATK? $4500 for the short block.

ATK SP97 Gen III Hemi 392CI Stroker Short Block Crate Engine
  • Block: Seasoned OE Gen III Hemi 2003-2008
  • Bore/Stroke: 3.927 x 4.050
  • Displacement: 392 C.I.D.
  • Crankshaft: Scat 4340 Forged 4.050" Stroke Internally Balanced
  • Connecting Rods: Scat 4340 Forged H Beam 6.125" ARP 8740 Bolts
  • Pistons: Forged -2cc Flat Top
  • Piston Rings: Moly Rings
  • Compression Ratio: 81cc=9.9:1 /85cc=9.6:1/89cc=9.2:1(based off .028" gasket)
  • Camshaft Bearings: Installed & Clocked to OEM Position
  • Freeze Plugs: Installed & Sealed
  • Oil Galley Plugs: Installed & Sealed
  • Weight:285

My 5.7 is running good but it's an 04 (build date 09/2003 on the truck) with almost 200k miles on it now. So I am doing my research incase I need to replace the engine in the near future.

Would I be able to go with a short block like this and if so, would I be able to reuse my current heads, assuming I have a valve job done and run the 6.1 springs and pushrods? I'm sure I would also need a better tuner than the old 3815 I am using now. Comp Cams 260 or similar work good with this? Would my stock trans be able to live behind this?

ATK also has long block 5.7 motor with a Comp Cams regrind they are claiming 400hp from.

The other option for a drop-in motor would be from Jasper Engines. $4332 base price and it seems like the only option is to have it installed by a shop:

https://www.jasperengines.com/stock-replacement-engines

Thoughts?

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Old 01-16-2018, 07:28 PM   #2
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Sounds kike a decent engine. The comp 260 is going to be a waste of time in that stroker if you get it though will need more cam to benefit. You will also need a diablo tuner of find someone that can tune with hptuners
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Old 01-16-2018, 08:09 PM   #3
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I did a stroker block just like this. I bought a used block ($400), cost me about $700 to fully machine it, and the Manley stroker kit was about $3000. So just the parts were around 4 grand. I had to have a cylinder sleeve installed so that was an extra $200 included in the machining price. Then I still had to assemble everything myself (which I wanted to do anyways). Add in some ARP studs for another couple hundred and that would put me past that $4500 block that comes pre-assembled. I do think the Manley kit might be alittle better then the SCAT one, but that’s just my opinion. I reused my stock 5.7 heads with the upgraded 6.1 springs and rods. I went with a custom cam from Inertia that ran me another $575. It was a big one though, about the biggest that would run on 6.1 springs and rods. Then don’t forget to add in a timing set, oil pump, gaskets (Cometic gaskets cost me $160), and does the block come with lifters? Those can get exspesive as well, $300-500 depending on brand you go with. Just giving you some ideas of what it cost me. I’m using the my stock trans for a few months while I get my other built. I will be very interested to see if it lasts me. I might just drive it till I blow it just to see how long it lasts.

Oh and I talked to a guy on fb that has a 392 stroker and a decent size cam. He said it dynoed at 420hp/440tq at the wheels, estimated 535/560 at the crank. Just to give you an idea. Hope that’s accurate haha
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Old 01-16-2018, 08:45 PM   #4
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I don't see anything mentioned about core charge...
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Old 01-16-2018, 10:07 PM   #5
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Quote:
Originally Posted by Redtruck-VA View Post
I don't see anything mentioned about core charge...
No core for the short block, free shipping. With tax, it would be $4,848.75.

It'd probably be worth it to just buy new built heads for a motor like this instead of trying to rework my existing, getting worn out after 200k mile heads. I've been doing some research and have found a bunch of the other accessory items for decent prices. I could probably save a few hundred bucks with some very careful shopping around.

I think what I will start doing is working on the supporting peripherals, like doing the valve cover and coil swap, getting the clutch fan replaced with electric, buy one of those ebay aluminum 3 core radiators I found and getting all that stuff installed. I can do all that slowly and gather other parts for an engine build as money allows it. My 5.7 should hold on for a good while still, I hope.

What I want and need is an everyday, reliable engine but with more power. I'd love to get one of the crate hemis that have been posted in other threads but they are crazy expensive compared to this route and would take a significant amount of additional work to get running in my 2004. And I will still need to address the transmission and probably swap out the rear diff to a Dana 60 at some point, assuming I can find one. I'm not trying to build a race truck, just something that is fun, can still haul my bikes and drive around every day and last me another 200k miles.
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Old 01-17-2018, 04:25 AM   #6
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Then that crate engine sounds like a winner. Stroker, cam, custom tune and ride!
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Old 01-17-2018, 05:12 AM   #7
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https://www.a2speed.com/p-2715-ray-b...ort-block.aspx
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Old 01-17-2018, 05:59 AM   #8
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When looking at these engines check for core charges. Unfortunately it takes the fun out of it as you'll see they want $1500 plus for the core. But still $5500 is pretty good.
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Old 01-17-2018, 06:40 AM   #9
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I've never dealt with their Mopar short blocks, but the LS short block yes , seams like 1 out 15 or so is junk.
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Old 01-17-2018, 08:12 AM   #10
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Quote:
Originally Posted by charged392 View Post
Then that crate engine sounds like a winner. Stroker, cam, custom tune and ride!
Yeah, it does seem like a decent deal. Although the a2speed link that TylerB posted, I found they have a full on crate 392 motor for $7999. It's VVT but I don't see that as too big a deal.

https://www.a2speed.com/p-2691-392-h...te-engine.aspx
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