Joined: Fri Oct 07 2005, 12:03PM
Location: Central Ky.
Posts: 1575
What TNT had is correct, the cam Heads Maifolds & the 4-bbl intake took it from 290to 335 unless it was an A/C version & then it had the smaller cam & was rated at 330.
Some of us were there in those days, got my 70' Bee in early 74 & always knew the 2 previous owners from high school. Car had that slight lope that all the magnum engines did. Car was bone stock at least until Igot done with it!
And yes, even with a 383-2 motor just the addition of the 4bbl & maifolds woke them up nicely, did that to my Fury not long after I got it. Made it more fun to drive. That & a B&M shift kit that was harsh enough to jar the butts outta the ashtray LOL! That's gone now of course. Was fun having poeple stare at a 4000lb boat barking the tires going into second all the time tho! It'll still do that just not as harsh now.
The difference between the 440 mag and the 440 6bbl was that there was a bit of a taper on the cam lobes to make the lifters rotate a bit better and none of the big blocks had this feature except for the 6bbl.Also it had a three bolt sprocket vs the magnums and reg big blocks.I believe they had the same lift and duration,i'm not sure about the overlap though. The magum cam with the short stroke of the 383s were a real giant killer.Glen
Hello, does anybody know if the HP cam (268-284-46) has good torque and if it is an all around better performing cam than the base cam(256-260-32)? I currently have a Lunati Voodoo#60301, 3-bolt, (not stock 1-bolt), cam with duration 256-262; lift .454/.475 in my '68 Chrysler 300 convertible. It's a rebuilt 440, bored .040 with a Holley 600 cfm. I wanted it stock non HP. It has good initial pick-up and torque and sounds good. After the initial pick-up it lacks the extra power to continue picking up speed, although eventually it will give me the speed on the highway. Has anybody had experience with the HP camshaft? Thanks a lot, Joshua
Joined: Sat Aug 19 2006, 05:03PM
Location: Ontario, Canada
Posts: 2919
I can't answer your original question, but I'm surprised that you're not happy with that Voodoo cam. Based on the specs, it sounds like a good choice for a close to stock 440 in a C-body.
Thanks for the answer Mike66Chryslers. I like the Voodoo cam and am happy with it. There's always that tendency to want a little more punch; and since the HP cam was an option on those cars...... Then again, there's the question of what exactly has to be changed in other areas of the car (valve springs, torque converter, exhaust man's, etc. etc.).
When I first got the car, it had a purple (pop up) cam and an Edelbrock 750 carb. Man it could go!, but vacuum suffered greatly, although it did have a vacuum assist canister which helped. Sometimes on starting, I get a little backfire, so thanks for mentioning the timing issue
After setting the timing I would try a larger carb.600 cfm will run out of steam in the upper rpm range of any self respecting 440 IMO. If you don't have dual exhaust that would be the first upgrade.
On a stock 440 in a heavy car with highway gears carbs are a trade off.In my 68 chrysler 300 with 440/2.76 gears the factory carb (AVS I believe) was a lot snappier down low than the 750 holley vacuum secondary was.Now at freeway speeds(dropping into second at 60mph)the holley would walk the dog. Something like an edelbrock 650 AVS may be a good choice or a newer street demon with 750 as well. It is all trial and error.