ASAP....

PnP is half off this weekend only.

I found a 75 Dodge Truck 4x4.

It has a auto and np203.

All the engine compartment id plates
are gone.

the dist is in front.

How do I tell if this is a 400 or a 440?

At a quick glance? It is a four barrel
carb with a top piece of aluminum color.
Is this a Thermoquad? Carter?

How can I tell at a quick glance
outside of looking on the passenger
side of the block where I know if its a
440 it will be cast underneath the exh manifold.

thanks

looking at the motor from the front of the truck, on the right hand side, just outside the lifter galley, closest to you on top of the motor there will be a flat rectangle pad with "440" stamped in it if its a 440. if its a 400 then the ID pad is located to the left hand side of the motor, viewed from the front, just in front of the number 1 cylinder, it will be stamped "400".

about the carb. my dad has a 77 with a 440 and it has a thermoquad, so that would be my guess, but im not for sure.

Unless you're postive it's an RB, I would have thought it would most likely be a 383.....?

Originally posted by RPR
Unless you're postive it's an RB, I would have thought it would most likely be a 383.....?

383's wernt offered in dodge trucks in 1975 in the US.

Who said it is original??? One thing we wrongly assume is that it is stock/factory...how many of us have modified trucks without the original engine? Something to remember.

The 440 stamped plate/casting is a great ID (on ALL RBs), the 400 may or may not have one...I have a 400 that has NO stamped plate/casting...my 440 did, the 400 does not, it was the first thing I looked for upon purchase. The only real way to tell is to look at the driver's side of the engine. I guess once you see one and see how they fit in the engine compartment in relationship to the firewall, you can tell at least if it is a B or RB block. The B blocks have a lot more room over them especially between the valve cover and the brake power booster.

As for the carb, the thermoquad will have a black plastic body, the quadrajet will have an all metal body. Unless your lucky and get an Carter AVS which is also all metal.

steved

Also, a thermoquad is a carter.

steved

IF it IS stock, it could only be a 400 or 440. I believe that all of the 400s came stock with a 2bbl, and I know all of the 440s came stock with the TQ 4bbl carburator.

from page 49 of HPBooks "How to Rebuild Big-Block Mopar Engines" by Don Taylor:
Block Serial Number Stampings

(On B engines, 351-400 ci, there is a pad on the right front of the engine below the distributor. On RB engines, 413-440 ci, there is a pad on the left front of the engine. These pads contain stampings that will quickly identify an engine and usually tell you a little about it.)

The stampings on the top of the block will look something like this:


C H 426 B
8-3-32


(These particular markings are of the form:)


Series / Hemispherical / CID / Bodytype
Month-Day-The Number Engine Built This Day


These marking are noted below. The stamping on the bottom of the block will be the formal serial number for that block and read similar to the following:
9-10-68 PT38326010001. These numbers are decoded as follows:
A. The first numbers are the date of the stamping (9-10-68)
B. The next letters indicate the engine assembly plant- in the case of our example, Trenton.
C. The next three digits indicate cubic inch displacement: 383 cid.
D. The next four digits (2601) are the 10,000 day calender numbers: 2601 = Sept 10, 1968.
E. The final four numbers (0001) show that this was the first engine assembled that day.

SERIES:
S = 1962
T = 1963
V = 1964
A = 1965
B = 1966
C = 1967
D = 1968
E = 1969
F = 1970
G = 1971
H = 1972
J = 1973
4T = 1974
5T = 1975
6T = 1976
7T = 1977
8T = 1978

OTHER STAMPINGS:
Diamond = 0.008-in. oversize tappets
Maltese Cross = 0.001-in. undersized crankshaft
Maltese Cross and an X = 0.010 undersized crankshaft
A = 0.020-in. oversized cylinder bore
B = 0.010-in. undersized main and rod bearings
E = cast crankshaft
H = standard 4bbl
HP = high performance
LC = low compression
O.S. = 0.005 oversized valve stems
P = premium fuel recommended
R = regular grade fuel may be used
S = special engine
WT or TW = water test
X = oversized valve guides

ASSEMBLY PLANTS:
K = Toluca
PT = Trenton
M = Mound Road
T = Trenton (400 and 440 only)
MV or MN = Marysville

And I'm saying my 400 does not have the stampings, you cannot rely on that...I looked on mine, it doe not exist. The 400 in my truck has a quadrajet. Also, if the truck had a two barrel, it could actually be a mounting plate with a 2bbl. I have seen plenty 440s that were 2bbl with spread bore intakes that had been blocked by an adapter plate....these were factory.

There are always exceptions. No single source can follow it all.

I also have that book, and it also falls apart for the block cast-in numbers on the driver's side. It called a 440 I had a 413.

steved

Originally posted by steved
And I'm saying my 400 does not have the stampings, you cannot rely on that...I looked on mine, it doe not exist. The 400 in my truck has a quadrajet. Also, if the truck had a two barrel, it could actually be a mounting plate with a 2bbl. I have seen plenty 440s that were 2bbl with spread bore intakes that had been blocked by an adapter plate....these were factory.

There are always exceptions. No single source can follow it all.

I also have that book, and it also falls apart for the block cast-in numbers on the driver's side. It called a 440 I had a 413.

steved

i'd say your looking in the wrong spot cause all of them i have ever seen, have the cast id pad. got pics to prove me wrong?;)

Originally posted by rockjeep73
looking at the motor from the front of the truck, on the right hand side, just outside the lifter galley, closest to you on top of the motor there will be a flat rectangle pad with "440" stamped in it if its a 440. if its a 400 then the ID pad is located to the left hand side of the motor, viewed from the front, just in front of the number 1 cylinder, it will be stamped "400".

This is the easiest way to tell but if you can not read what the pad says you can still tell a 383/400 from a 440.. The 383/400 has the pad even with the bottom of the head on the 440 the pad is about 1/2 inch below the head due to the extra deck heiht of the 440..

If I hadn't sold the damn thing I would take a picture...I know where to look, the stampings weren't there. I should have said it that way...the pad was there, there were no stampings, just a blank pad. And, actually, the cast-in number on the block is pretty much foolproof if you can read it!

I wasn't starting anything, just stating a fact, not everything is completely PERFECT. Books are wrong...the SA book I have has been wrong several times. Especially on the newer BBs. It also doesn't cover the "Industrial" versions of these engines very well either.

steved

its possible that the stamping got machined off since that pad is the same as the deck height of the block.

Originally posted by steved
If I hadn't sold the damn thing I would take a picture...I know where to look, the stampings weren't there. I should have said it that way...the pad was there, there were no stampings, just a blank pad. And, actually, the cast-in number on the block is pretty much foolproof if you can read it!

I wasn't starting anything, just stating a fact, not everything is completely PERFECT. Books are wrong...the SA book I have has been wrong several times. Especially on the newer BBs. It also doesn't cover the "Industrial" versions of these engines very well either.

steved

i know you werent trying to start anything, i'm just a see it with my own eyes kinda guy. i agree with the coverage of industrial stuff.

it could be very well possible that the stamping may have been machined off previously. all kinds of weird stuff happens to motors over the years.:D

Motors, frames, axles, wiring, springs, bodies...is there anything we don't swap around?

Makes identifying anything older than 95 is almost a guess.

steved

Sometimes just paint can fill in the stampings on those pads but I've never seen one with out them. I do believe it would be possible that one didn't have anything on it, even from the factory. Ma Mopar has always been good about spitting out odd balls here and there.

But as was said, look at the casting #'s on the side for an alternative.

Jordan