I'm wanting to put a 408 stroker crate motet in my ram. The stock 360 has cracked heads and just not worth rebuilding. Has anyone done this before? Any problems? Can I use my same computer? Tell me what you think.

You'll either need an aftermarket efi controller or your stock ecu recalibrated. Google search sct tuner. Bigger injectors, upgraded fuel pump likely also needed.

Think I could run all but the computer stock for a while and get by with it?

Changing cams? Anything much
other than stock will be trouble without a retune.

Well the crate motor comes with a cam but I'm not sure what the lift and duration of the cam are.

Stock computer?

If the compression ratio is close to stock and the cam is stock, I believe so.

It's an idea I've certainly given consideration to but my 360 won't give up.

You'll have to find out the cam specs. Especially critical in an efi situation.

I think I'm gonna attempt it with stock computer and if it doesn't run well I will get a tuner. I just don't know if it would hurt anything or not.

Won't hurt anything. Power, mileage and driveability just won't be what they should.

A 318 computer runs a 360 just fine so a 360 computer should be able to run a mild 408 just fine. For a cheap injector upgrade (so the computer don't have to add a bunch of fuel through the trim) you can just get a set of the bluish-grey injectors from a 460 ferd. But like everyone is saying the bigger cam can really screw with the confuser more than the CID, with just a CID increase the bigger injectors would be just fine till you get it fine tuned.

id look into having an sct tuner. ive heard great things about hemifever tuning.if i wouldn't have bought a polara id be ordering a tuner

Seriously? gonna spend $5 grand on a 408 stroker motor that's probably capable of 450-500 hp, but you're going to skip out on a $300 tuner?

why bother doing the 408 at all then?

OP, do your homework and Google "problems, tuner, Dodge" and see what you come up with.

You are on the right track trying the factory set-up first.

WTF???? if you going 408 get a tuner, look up Ryan Hogan (flyingryan) he can tune your truck with sct tuner. Stock injectors will work up to 415whp then they will start to run out on a 408 stroker. The stock computer will not like the low map signal and dump fuel and run like crap, GET A TOON!

So if he were to put a 318 crank in a 360 block would he have to get a TOON?

How many vehicles did that Marty at KRC eff up? You would have thought that guy was King of the Internet at one point, now he kinda just vanished off the face of the earth, huh?

So is this Ryan the new hype for the uncrackable Chrysler computers? Educate me. I want to do a twin-turbo 360 Magnum.

Proven waste of money and time as shown in Diablosport and Superchips Forums. SCT doesn't even have forum support.

I believe Rick Ehrenberg is the only one who's cracked a Chrysler computer and they had Factory help doing it.............perhaps he can correct me here or offer some clarification.

Does this look like a "hand-held" tuning operation to you?

Ref: Mopar Action, June 2007.

SCT works. Period.

KRC is a joke. go onto ANY Dakota forum and start asking about KRC.

Ryan knows what he's doing. See, KRC would offer you "box canned" tunes based on a list of mods done to your engine. there was no feedback loop.

Ryan (FlyinRyan performance), and Sean (hemifever) both do SCT now, and they both want you to have a datalogger and a wideband O2 so that you can monitor what's going on in the engine and your AFRs to ensure you're not rich or lean. THey also don't go "balls to the wall" out of the gate. They give you a very conservative first guess at where you need to be based on your mods, then they sneak up on the tune. Ryan even tells you "DO NOT GO WOT WITH THIS TUNE!!!" He demands to see the datalogs from just a cold start, idle/warm up to see what the engine is doing before he wants you to drive. then, he'll tell you, no more than half throttle. then after afew tunes, he'll give you the go-ahead and say "ok, we're safe now to go WOT, run it out and let's see where we are.

after about 8 or 9 iterations of this, you finally get a tune that is streetable, makes good power, and won't blow up your motor.

I'm running a 222/228 107 LSA cam that idles at 8" of vacuum in my 5.9L Magnum with edelbrock heads, headers, etc (haven't dyno'd with new heads yet, but easily a 400-420 crank hp motor) using a factory computer, stock injectors, and stock sensors. all tuned by SCT.


KRC...lol haven't heard that name in a few years. There's a reason they went out of business, and there's a reason why Ryan had to take a vacation from tuning just to get a break due to the number of people asking him to tune their engines.



I would NEVER do a 408 without having at a minimum, SCT.

A lot has changed in 8 years since that pic was taken

And in case any one is wondering when they say toon, they really mean tune. I don't know if that is a new slang term they are trying to get off the ground or if it was an accident.

Just Chad forgetting he's talking to a bunch of guys about 20 years older than him

yes, SCT is good enough for big hp boosted applications. SCT can tune a 5.2, 5.9 series LA based Magnum motors, 4.7L overhead cam motors, 5.7L Hemi motors, pretty sure the 6.1/6.4 Hemis as well (that one I'd need to fact check) as well as the Viper V10 motors.

SCT is essentially the hotrodders answer to cheaply re-tuning their factory computers to work with modified modern EFI motors.

It is VERY capable