I am lookking to buy a 340 or 360 stroker crate motor in the 400HP range to put in my 72 Demon with a 727 auto and 355 gears in the 83/4 rear. Any recommendations on who would be good to look at??

My 340 puts out 400hp. Might want to shoot for a little more maybe 450 or 500. I know the 380 I have to replace it puts out 550. Can't wait to swap that in. If your in the South Shore area I used Reid's Auto in Whitman. I'd find a nice 360 and have them build it. Of course depending on your budget you could get my 340.

I agree with the post above. I dont really see the point of going stroker with such low HP either you can easily get that out of your 340 or 360 and have a fun driving street car. I would contact MRL performance they build lots of nice stroker combo that dont break the bank.

Advantage of the 4" crank in a small block is the additional torque, particularly down low.

Horsepower is more a function of air flow.

Run the same heads on a 340 as a 408, and you get about the same peak HP, but at different RPM. Got to rev a 340 about 20% higher to make the same HP as a 408.

Building the stroker only cost a few bucks more, essentially the cost of the crank. That is until you get tempted to make other upgrades.

So 400 hp is probably just a bit conservative if you're looking to run stock heads. It'll be a torque monster though. My 410 with mildly prepped J-heads could blow the tires off from a roll with just a blip of the throttle. Without getting into the specifics, it was a pretty mild set up and I guesstimated it to be about 410 hp. With my RHS/Indy heads, I'm probably closer to 450 now, but still leaving a lot of power corked up in the stock intake.

I can't answer your original question though. Not sure who builds the best "crate" stroker these days. Pretty easy to source your own parts (ie stroker kit) these days and get a competent shop to build to your specs.

I don't want to turn this into an Eagle bash, but I'd definitely steer clear of any crate motor utilizing an Eagle rotating assembly.

I agree about MRL Performance. Mike Liston is the man when it comes to stroker motoers. Mike built a 340 stroker for my RR and it turned 502HP and 507 Torque...You can find him in the Mopar Engine build off compations and he is a member here.