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cam selection for stock 440

cptk3rk

cptk3rk

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440 motor and 727 is out of a 75 imperial and going into 67 Coronet

deciding what cam to go with from hughes, any suggestions would be great


its just for street use & smoking tires having fun, not serious racing, just want the motor
run happy and get a little more power

i'm leaving the entire motor stock with 8:1 compression with 452 heads, what kind of flat tappet cam does a stock low compression 440 like?

putting edelbrock torker 2 intake on it running either a edelbrock 600cfm or holley 750 double pumper on it, higher stall converter with suregrip 3.55s

is there anything really to gain with just a cam swap or should i leave it alone?
 
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You will need valve springs to match, but good time to replace the valve stem seals too.
The SEH1620 is about as large at I would go with the stock rocker arms and low compression ratio.
 
Any cam above OEM will require spring and valve guide work. 452 heads have a weird intake valve guide. If your not prepared to take the heads off and set them up for springs and additional lift don't change cams.
 
lewtot184 said:
Any cam above OEM will require spring and valve guide work. 452 heads have a weird intake valve guide. If your not prepared to take the heads off and set them up for springs and additional lift don't change cams.
Click to expand...
Agreed

440 motor and 727 is out of a 75 imperial
Click to expand...
A “75” 440 should have 975 heads, and I don’t recall if those had the same oddball intake guide situation that the 452’s have.
Pull a v/c to confirm which heads you have.
 
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I have a whiplash cam in my late 440, 47 Plymouth gasser, dual quads and headers. It is a beast, has great low end torque. It has pretty radical idle! I haven't run it through the 1/4 yet!
 
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ckessel said:
Have any contact info?
Click to expand...
got this number 284-477-7776
from this thread
Saldazzo

Thread 'Contacting Mr. Six Pack'

Good morning everyone,

I am looking to get a hold of Mr. Six Pack for a camshaft for my father's 69 A12 Superbee. I sent him an email earlier this week but I am not sure if he is still reachable from that. Anyone know the latest regarding his whereabouts and contact info?

Sal
 
the mr. 6pak cam is recommended a lot on this sight, but does anybody here really know what they are?

in my opinion a low compression engine needs the intake valve to close sooner to trap the intake charge quicker which can make more low rpm cylinder pressure. i don't know what cam is in the engine but i'd speculate it's mopar's 256/260-.425/.430 lift. that is mopars factory torque cam. if i'm right the intake valve will close at 58 degrees ABDC; that's fairly early. you'll need something short with a tight LSA to close earlier. a mr. 6pak doesn't do this. i know what the intake lobe is and LSA for those cams and it's more similar to a magnum cam that closes the intake valve around 70 degrees ABDC.

one of those whiplash or comp cams thumpers use longer duration lobes (for a low compression engine) with very tight LSA angles with a lot of overlap. in my opinion too much for 8:1 compression. the argument will be they are designed for low compression. i think not. they're for the guy who wants the root beer stand idle.

these cam threads are not an excercise in good mechanics. for the most part the opposite. they always lead down to the same rabbit hole.
 
Factory .154 hole 440s can be made to go. 2 examples;
64 Dodge, 3500?w/o driver- .528mp - ported 906- good intake- big stall, 3.91- 4.56 gear-- 12.0 @111
76 3/4 ton camper 7500 - estreet head- .509mp - 3000stall- 4.10- RPM intake- 12.60@ 105 11.90@ 110 on juice
The truck has the original #s motor that used to go camping.
 
I think a lot of times in the lower cr applications, a longer duration cam than “optimum” ends up be chosen for the “illusion of power”(rumpity rump idle).

I’m primarily talking about engines going in vehicles that will see no, or very little, track use.
 
PRHeads said:
I think a lot of times in the lower cr applications, a longer duration cam than “optimum” ends up be chosen for the “illusion of power”(rumpity rump idle).

I’m primarily talking about engines going in vehicles that will see no, or very little, track use.
Click to expand...
I look at it from the top down.
Build a great engine with 20 thou down pistons. Trickflows/ whatever, HD solid 600 cam, big carb/ intake etc etc.
Now, simply slide the piston crown down .130 ,
How much different are the power curves going to look like? Lower, and likely more divergent at lower RPM. But once you get it into the working RPM ( 4000-6500) it's just down a certain percent of HP.
 
Wow.
This is the same thing that happens on FABO when someone asks about a cam for a 318 that's "one step above stock".

They always turn into threads about:

4000 RPM converters
.600 lift cams
4.56 rear ends
Stroker builds
Keeping the stock cam
 
Bob offers a variety of cams.. it depends on what you are looking to do. Best thing if you have a question call the man directly. He is a very nice guy, he sells them as various numbers like 1 thru 4 and he will ask a variety of questions and advise you... one of the nicest guys in the hobby and sharp as a tack!
 
I talked to him about an hour ago. No spec's given, understandable as it's his homework. About $650 for stick and lifters. Shipping not included.
 
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