Commando

When I bought my 1977 440 engine about 3 months ago I was looking at a motor home engine and was told that I must rebuild it as there was a certain way they were maintained or kept cool. Not sure which but in order to turn the "slug" into anything I would have to start with that. I am sorry I can't remember exactly but I didn't buy that engine, went for one out of a New Yorker with 38k and still doing a partial rebuild as you know things sit and stuff can happen, always good place to start so you know what you have and there are no other internal problems.

christineman

hey folks,,, could one of you out there in mopar land please give me some advice... Ive got a factory untouched 69 GTX engine, I want to bore it .030. WILL I LOOSE COMPRESSION? second question, if I do loose some compression, how can I get it back, maybe shave the heads and how many thousands?

theomahamoparguy

no you will not loose any compression if you just "bore it". As long as you keep everything else the same {piston compression height, head gasket thickness, valve notch volume etc}. You may gain a miniscule amount actually.

Be careful with that GTX motor, those numbers matching engines are hard to find. .

78D200

I wouldn't bore a motor unless it is needed and like moparguy stated, those motors are getting hard to find.

theomahamoparguy

As far as I know, with the 440 Rv motor, they vary with what they came with. Many had extra mods for better cooling of the heads, Some had "leftover" 440 six pack rods with an externally balanced damper. The real score is the tranny, it had heavy duty internals and a planetary gear unit with more gears in it. [The 413 motorhome motor had special heads that look totally different].

78D200

That is true. Some of the 440 motorhome blocks would be great for a build.

scotts74birds

Really?! The local yard is full of them. Thanks for the tip.

78D200

Don't just go out and start picking them up. There are some that are not worth the time. DO a little looking and see what is out there. If you can find one with a 413, go with it.

scotts74birds

Fortunately, there is not alot of turnover out here. whats there, will stay there. Too broke to do other than look and plan right now.

theomahamoparguy

I might have talked myself into going to find one by answering the question.

Oh this darn forum! ( makes me get too many crazy Ideas)

{...making a fine stew with goblins...}

scotts74birds

I still like balloons

ykf7b0

All a 440 (any year) needs to really scream is a compression ratio of 10.0 to 10.5. This can be achieved a number of ways without sacrificing driviability or having to burn racing fuel in a street car. I would invest in some good forged pistons such as Wiesco and maybe locate some 915 closed chamber heads. Couple this with a moderate cam without too much duration at .050 (238-244 will be good) and a carburetor that wll keep it fed well (800 or 850) and you will be really surprised.

71mopar

The best 440 engine years were between 1966 (the first year) and 1971. After that the compression dropped a lot. I picked up a 1966 running with 75,000 miles which was in the original car a 1966 chrysler imperial. Will be trying it out in my 1971 barracuda soon.

67 GTX

also, after 71 you may have to deal with the thin walls

ykf7b0

I am running a 1975 440 in my roadrunner that was transplanted from a Chrysler New Yorker. It has a .030 over bore and I have been told that this is max overbore for any 440 past casting year 1975. I'm not sure if that is solid information but I do know that my '75 is fine with absolutely no cooling issues due to thin cylinder walls. I would not be afraid of any 440 up to .030 overbore and might even consider .040 , if ever needed, on my '75.

KyleLR

Actually the thin walls started in 76, every block 75 and older are thick block design. They don't recommend boring on blocks 76 and newer.

69POLARA383

Actually, there is no "thin wall" ever...Just varying degress of core shift from block to block.

TVLynn

Motorhome had a version of the TF727 called the loadflite Different physically from the standard 727, SO you may be able to use the insides in a standard 727

440Dart

THERE IS NO SUCH THING AS "THIN WALLS" ON ANY RBB MOPAR ENGINE. I'm surprised at such a statement for as much "experience, and knowledge" on this site. There is no such thing as thinwall blocks. They DO NOT

exist.http://www.440source.com/blockinfo.htm

the later 440s, though they have a lower compression ratio, also have some great advantages that can be discovered by reading the page in the link I've provided above.

Best of luck!

TVLynn

If there is any question ? Have the block sonic checked. Motor home engines are more like 8 to 1 I would put a stroker kit in it with a forged crank.. 9.5 compression for street

Moparbob

I OWN a Sonic Tester....and I have tested many BB Mopars over the years.

I can't find any "significant" differences in wall thicknesses between early and late 440 Blocks....the late Blocks "might" even be slightly thicker on average ??....but they also seem slightly "softer" when Honing...maybe less Nickel in the Iron??
IMO, one thing is for sure.....ALL 440 Blocks will do just fine for most any build.

IMO also, the absolute BEST stock Block to use for a "Higher" H.P. effort...is the "213" Casting 400 lowdeck Block.

Skwerly

A friend of mine put a 440 motorhome engine in his '72 RR and it had some major thump, but i don't know what he was running for heads. i think it was just stock. that car MOVED, especially off the line.

yep, what i'd do is switch out the heads for a tad higher CR and slap it in. 440s are beast.

Don Bright

New to site. I paid over $6,000 to rebuild my 1973 Chrysler 400 (Imperial body), and then the body got trashed.

I would like to sell the engine or the complete vehicle for a fair price.
donbright@yahoo.com

TVLynn

Earlier pre 71 blocks are better ONLY because most of them have a forged crank.. Later blocks have a cast crank. ALL 400's had cast crank..

old tired rebel

Can the motorhome 727 be used in a car application or do I need to get a different transmission?