So I have seen this question come up on other BB's :rolleyes: but I wondered what y'all thought.

Since we are running vehicles in the 5000-6000 lb class is a BB too much?

I have a 440 core waiting on cash, and my 345 is tired :zzz: I figure a realitively mild 440 build up is going to get me a better torque curve and weight has got to be about 6's, not to mention it will be cheaper than building the 345. As for longevity, it's a trail rig, if I put 150,000 miles :eek: on it you will know I either won the lotto or have died and gone to trail heaven. I do wonder if my d300 will hold up behind a 440/727??

So what would you choose and why??

PS if ya can't tell I am bored, and the bikini top post that has been floating around does nothing for my tech craving....:flipoff2:

IMO a steel crank 440 is the best big block going hand down! The engine has a few very cool features like the exteral oil pump, deep skirt block. Doesn't cost much to build into a 500/ft lb 450 hp monster.

I do wonder if my d300 will hold up behind a 440/727??

What size tires? What R&P?

Originally posted by Old Scout
IMO a steel crank 440 is the best big block going hand down!

True!

Well, if you aren't worried about longevity, the big SV selling point is moot. A 440 probably the best choice for a Scout, other than an IH motor.

One note on the 440. There is a particular head casting (I can't remember which) that is frowned upon by hot rodders, but makes an excellent truck head due to the shape of the ports& combustion chambers. Car Craft did a good build up on 440's about 2-3 months ago.

Originally posted by The Mick
Well, if you aren't worried about longevity, the big SV selling point is moot. A 440 probably the best choice for a Scout, other than an IH motor.

One note on the 440. There is a particular head casting (I can't remember which) that is frowned upon by hot rodders, but makes an excellent truck head due to the shape of the ports& combustion chambers. Car Craft did a good build up on 440's about 2-3 months ago.

The 213 moterhome head is not good for power but will take a real beating with no problems.

The 906 and 346 heads are what you want!

BTW BB chrysler heads are called by the last 3 #'s only. The 213 heads are casting #3751213 and the 906 are #2843906 and the 346 are #3462346

Originally posted by Old Scout


The 213 moterhome head is not good for power but will take a real beating with no problems.

The 915 and 346 heads are what you want!

BTW BB chrysler heads are called by the last 3 #'s only. The 213 heads are casting #3751213 and the 915 are #2780915 and the 346 are #3462346

witch vehickle had witch head

37-38.5 inch rubber, have not decided. and either 4.56 or 4.88 gears. I would like to keep the d300, but I want the lower gearset, and I would most likely need the HD 32 spline output, the price tag on that comes out to 1400.00 or so :eek: for that price I could run a 203/205 doubler and sell my twin stick 300 and still come out ahead...


I have the 452 heads which flow real close to the 915 heads. Any other build up ideas? I want to keep it mild and keep the powerband low (obviously).

What are your thoughts on roller rockers, worth the cash?

build up ideas?

3 angle valve job with 1.81 2.14 valves, Crane Hydro roller cam, stock rockers, beefy push rods, KB pistions (9.25 C.R.) and your motor will be in the 450hp - 500ft/ lbs.

C.Y.A. 906 heads 1968-70 383-440
346 heads 1971-72 383-400-440
452 heads 1976-78 400-440

I found the desktop dyno for the 440 in my boat. Check out all the low end torque!:D

Here are the specs:


Block 1972 440 bored .30 ,ARP Head and Main studs

Crank stock steel ground .10/.10

Rods Stock polish and shot penned, ARP wave loc bolts

Pistons Arias forged 10.5:1 compression ratio

Rings Total Seal Moly

Heads Chrysler 906 full port and polish hard seats, bronze guides

Work done by Wes King Racing Heads

Valves Manley Pro-Flo Stainless 2.14 Intake 1.81 Ext

Rockers Comp Cams Pro Magnum steel roller

Camshaft Isky roller # 165150

Duration @ .050 248 , Lift .531, 108 centerline

Lifters Isky pro roller solid lifter



Cam drive Cloyes Double roller

Damper Fluidamper

Oil system 6-Qt aluminum pan , Miliodon external feed system

Mopar Performance oil pump HV\HP , HP-6 oil filter

Housing and filter, 3qt off shore oil cooler. Milodon

Windage tray. Milodon external pressure adjuster.

Ignition system MSD pro Billet Distributor. MSD 6M-2 box, MSD Soft touch

Rev limter. Mallory Coil

Intake Edelbrock CH-28 Dual Quad manifold

Carburetors Two Edelbrock Marine 600 cfm 4 barrel

Another vote for the 440! :D

You'll be fine, the D300 is a tough ol bird! My drive line = '67 375HP 440 (67 GTX), matching 727 and Scout 300. 4.88's and 38.5 SX's. It's been together 5 seasons with no problems. And don't let the CJ-8 fool you its damn near has heavy as a Scout. It's on a Scout II chassis.

I am going to convert it to a Jeep 300 this next winter, not that's there's anything wrong with the Scout version, in preperation for the ATLAS. WHY? Then I will have interchangable Tcases. I can run the Jeep 300 for snow and sand, and the ATLAS for the rocks. I currently do this with a D20 and the IH 300, but the D20 2:1 gear isn't quite enough and it's messy... :D

Originally posted by Bob Levenhagen
Another vote for the 440! :D

You'll be fine, the D300 is a tough ol bird! My drive line = '67 375HP 440 (67 GTX), matching 727 and Scout 300. 4.88's and 38.5 SX's. It's been together 5 seasons with no problems. And don't let the CJ-8 fool you its damn near has heavy as a Scout. It's on a Scout II chassis.


So your running a Heep body on Scout II running gear? Why not just stay all Scout, I mean admit it your a Binder lover at heart. Your Heep buddies might disown you, but we'd take you in.

Never said I wasn't a binder lover at heart. There's one still in the stables. '70 1300. THe 13 year old daughter thinks she wants an 800 model Scout too.

Went the Heep body be cause it was straight and no rust. And lighter ;p

I went with a 440 for two big reasons. For me it was more RPM's and RPM potentential and the availablity of aftermarket parts.

It can be a lot of motor for the street. I made sure brakes ,steering everything was up to snuff or better. I just always think it ain't a comaro so don't drive it like one.

452 are fine they have hardened seat. The 915 are coming back since there closed chambered you can achieve something called quench and run a pretty high compression ratio on street gas.

here's a mopar site i frequent


www.moparts.com Q+A section. Do a search for Quench.

I think you will like it.
My second choice would be a Mopar 360 fuel injection(new style) same reasons as above plus the are roller cam motors. Save you a few start up $$ on parts.




wp