I thought I remembered years ago there being a thread on here with motorhome short block combos. I came across one the other day and am slapping some parts on the stock short block to put in my 67 satellite. Wonder power/et results with warmed over stock or aftermarket heads cam etc. Thanks.

Those motors are really low compression (7.25 to 1 or so )with all the stock parts, if you want decent performance from it I would replace the pistons with some for a 1968 to 1970 375 HP 440 motor and use a set of the cheaper 75.0 CC Eddy street heads to make the compression compatible with today pump gas
Or better yet have the crankshaft offset ground to BB Chevy 2,200 rod journals and have the stroke increased from 3.750 to 3.910 and use some of the cheaper after market BB Chevy 7.100 long rods and piston kits form KB or United machine forged Icon piston line for that combination like I did for my 1966 Dodge Coronet Deluxe 2 door sedan That stroke increase with a standard bore block will make close to 364 C.I. if I'm remembering correctly, 371 C.I. with a .060 over size bore

My son had a low comp style 440. MP 484 cam, Eddy heads, RPM intake, 600 Eddy carb, headers, 3.91, large 12" low performance stock torque converter, 255/60 radial T/A's. Though this combo seems all wrong it ran pretty decent. The cam/converter allowed no spin starts from just over idle. Ran 12.90@109 in a all stock 65 Belvedere.
Doug

Cab your memory is off by 100 c.i.

Here are a couple, hopefully a positive influence.


https://board.moparts.org/ubbthread...2292/re-440-pistons-120-in-the-hole.html
https://board.moparts.org/ubbthreads/ubbthreads.php/topics/113546.html

There are a bunch of threads out there, you have to scrounge pretty hardcore on Google to come up with anything since the search function here doesn't go back far enough.

Your correct

I wish I remembered the combo I built for my Dad many years ago. .030’over 440, aftermarket cam, and I even ported his heads. That thing was a bear and towed great.

The easiest combo in the world is a 440 block that's bored to 4.342 (standard 400) and a stroker 4.15 crank with standard 440 6.76" rods using the stock 400 piston. This is combo the 4.15" stroke was decided upon by Mopar. Throw on a set of stealth heads and make some cheap power and torque. As I remember the piston comes up very close to zero deck, maybe. .015-.020 in the hole

People fuss about the heavy bobweight but it's lighter than a factory 440, even more if you whack 1/2" off the factory pressed pins.

I did one 20 years ago. Stock short block ported big valve 452 heads solid cam I think it was the Mopar 590 SFT cam. Had a good 9-1/2 in convertor,4.56 gears and 30X9 slicks. I ran it 6500-6700 in a 64 Plymouth 3600lb 11.80s.I only ran it for a short time. It ran so good I wanted more. Built a better short block added a roller bar had PRH spec a cam and ran a best of 10.86 @ 123 mph in the same car.

I had a cast crank '75 440 that was a re-ring and bearing special.

It had the MP .484 cam and, at first, 906 heads and stock intake. Within a year it had standard port Stealths and a Holley Street Dominator.

It ran really well for what it was and was a lot of fun. I thought I had a 6500 chip in the MSD when it turns out it was a 7500 chip.

One day on a particularly spirited run down the highway I lost a wrist pin at the top of 2nd gear. The huge cast piston just couldn't take it anymore. The rod ended up sawing my perfect virgin block in half and made a metal soup out of the lower end.

We were going fast enough I made it to the turnoff for the neighborhood and coasted within a few blocks of my house. The neighbor that was with me swore the car came off the ground when it blew and we were skating in oil and antifreeze for a bit...

I never made it to the track but assume it was a probably a mid 12's combo as the car was lighter back then.

I figured I had about $300+ in the shortblock and the heads came out unscathed so it was a reasonably priced lesson.

Many years ago we built a motorhome block 440, it went 12.50's with a Torker II, 750 d/p Holley, a .509 cam, headers 3.90 gears and a B&M 10" converter. Weighed about 3700lb w/d at the time. Eventually it ran in the hi 11's with Indy S/R heads and 1.6 ratio rocker arms. An even later incarnation of the motor ran 12.00's with iron heads and a performer rpm.

Wouldn't one have to cut some valve reliefs in the pistons with that? Even with the low-comp pistons down in the hole there is a limit to what cam can be run even with stock valve size

I had all the parts and I mocked one up but never built it with the oem pistons, but I think an KB Hypereutectic piston was 1.9 ch and stuck out about +.030 which I think I would have milled down, it already had the eyebrows. I would up using a bushed rod with a .990 BBC pin and an Arias piston

I think It would actually be a really cool combination with the KB's which were about $200 a set back then. i wouldn't have blinked at putting some eyebrows in the pistons though, I think the exhaust might have been more of an issue than the intake on that one.