Diodedog
Well-Known Member
That math is not correct, a slight but not noticeable increase in lower rpm torque but identical HP if both have the same induction, cam and CR.
440 vs 413
- Thread starter BamaCharger66
- Start date
gtxrt
Well-Known Member
more cubes don't equal more hp ? 401 nail head buick 325hp,445tq. 425 nail head 340hp,465tq. same carb same cam same compression. on a 440 engine going from a 4.32 bore to a 30 over 4.35 bore = 5 hp
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gtxrt
Well-Known Member
wallace racing.
Geoff 2
Well-Known Member
More cu in means more tq, all else being equal. So going from 413 to 440 you would expect about 27 more ft/lbs of tq. But not necessarily 27 hp more. That is because HP is a calculated figure from the tq & rpm, & the rpm where the tq is developed is usually lower when cubes go up.
gtxrt
Well-Known Member
383 magnum = 335 hp. 440 magnum = 375 hp. same 10:1 compression, exact same camshaft, exact same heads, same single 4 barrel carb and same exhaust manifolds. where does the extra 40 hp come from ?
The 440 sounds like it ran better. Without a rebuild it sounds likw a better canidate. Niether appear to have a HP cam, exh manifolds, or heads. Though the 440 will proabably have 158 or 915 heads with the smaller 1.60 exhaust valve that could be opened up for the 1.74" valve. I see a question about nitrous. What is your plan for the engine? Full rebuild? What aftermarket parts? You can not use the 65 trans. However the good news is that they are the Holy Grail of push button transmisions. A core will easily bring $300 or more which will pay for the rebuild parts for the other trans.
doug
doug
BamaCharger66
Well-Known Member
First start up! Sounds pretty darn good. I had to:
Put on my known good Edelbrock 1406 (600cfm).
Replaced a couple plug wires. Replaced spark plugs. Replaced fuel pump.
Plans are to clean her up. She’s filthy. Might paint. And now on the lookout for headers and a carb. Might do MSD and another intake. I read this year wasn’t the best. I’m super happy with how she sounds and revs. That 1406 is a good little carb. Stay tuned.
BamaCharger66
Well-Known Member
Aaannnnd - the first start for the 413. Barked right off but seems like there’s a vacuum leak or maybe a bad plug wire. Still happy that both of these run!
Diodedog
Well-Known Member
They are not the same carb, but a 64 Ply 383 and 426 SW have the same carb cam and heads with the 426 having a hair more comp and being able to use a bit more duration in NHRA Stock, over the years NHRA has factored them within 3 HP of each other and there are more cars running the 383 than the 426 SW.
gtxrt
Well-Known Member
yes your right 625 vs 750
BamaCharger66
Well-Known Member
Question for you guys:
After some reading last night, I discovered that my ‘67 Newport parts rig possibly has sought after 915 heads? They sit on its 383. They’re fairly rusty on top. Somehow condensation crept up to them.
I’ve never rebuilt heads but I do know they sell the springs, rods, keepers, etc. Do you guys think it is worth rebuilding and then go onto this 440? Should I just find 906’s? Aftermarket? Thx!
After some reading last night, I discovered that my ‘67 Newport parts rig possibly has sought after 915 heads? They sit on its 383. They’re fairly rusty on top. Somehow condensation crept up to them.
I’ve never rebuilt heads but I do know they sell the springs, rods, keepers, etc. Do you guys think it is worth rebuilding and then go onto this 440? Should I just find 906’s? Aftermarket? Thx!
A 67 383 would not normally have 915 heads. Most likely it has 516 heads. 915s have a soft plug on the ends...516 don't
If they were 915s ( unlikely but possible someone put them on) Yes I would rebuild and use them over 906' s.
Most likely need the big exh valves installed
Most likely need the big exh valves installed
BamaCharger66
Well-Known Member
What model aluminum heads do you suggest? Not building a drag car. So, inexpensive is better.
Here are some 906’s that popped up near me. They seem to look ok.
Here are some 906’s that popped up near me. They seem to look ok.
Thunderdan
Active Member
Sounds awesome, however how much $$work$$ went into those 906's as compared to TF 240's to get them ready to bolt on?
BamaCharger66
Well-Known Member
By the way the heads on the 1967 Newport do have soft plugs….
BamaCharger66
Well-Known Member
Ok. Going to need some help on a few things. Things I’ve done so far:
Pulled the 383 out of my 66 (not original & overheating). Dropped in 440. Had to use my motor mounts from my 383. And use 383 manifolds as the 440 had center dump exhaust. Also swapped the leaking 727 out with my ‘68 Imperial’s 727.
When I pulled the 383 and trans, I thought I had everything disconnected. I didn’t. The shifting torque shaft was still in place. Well, I bent the shaft pretty good. I tried bending it back but it’s tweaked pretty badly.
From this diagram, it appears it was straight up and down and went into the ear hole on the transmission. After dropping the motor in (both mounts bolted up), it isn’t even close to lining up. I guess I could rob the shaft linkage from my other 66 Charger for the time being. I need to inspect the shifting linkage anyway. Maybe that’s why it’s not close to lining up.
Thoughts/suggestions?
Pulled the 383 out of my 66 (not original & overheating). Dropped in 440. Had to use my motor mounts from my 383. And use 383 manifolds as the 440 had center dump exhaust. Also swapped the leaking 727 out with my ‘68 Imperial’s 727.
When I pulled the 383 and trans, I thought I had everything disconnected. I didn’t. The shifting torque shaft was still in place. Well, I bent the shaft pretty good. I tried bending it back but it’s tweaked pretty badly.
From this diagram, it appears it was straight up and down and went into the ear hole on the transmission. After dropping the motor in (both mounts bolted up), it isn’t even close to lining up. I guess I could rob the shaft linkage from my other 66 Charger for the time being. I need to inspect the shifting linkage anyway. Maybe that’s why it’s not close to lining up.
Thoughts/suggestions?
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