440 Hp guesstimate

[70rrclone]

So, im curious. What are the horsepower/torque estimates for my 440 are.
Dynosim 6 say 590 but I think that's quite high. I'm thinking closer to 500-525. So what's your thoughts?

Thanks!


77 440. Wiesco pistons measured 9.84:1.
Trick flow 240 heads
1.6 mancini rockers
Comp xe 285hl cam.. .545 lift 241/247 @.050
Edelbrock rpm intake
850 brawler carb.
Msd ignition.
tti 2in headers

 

[RT68440]

I would say around 550-560. I just had my 440 rebuilt and dynoed and it's similar to yours.

Numbers matching '68 440 (stock stroke, 9.6:1)
Stealth heads (ported by KG Engines)
Comp 284 cam (240/247, .507/.510)
Comp Pro Magnum rockers
Edelbrock CH4B intake
Holley 850 carb
TTI 1 3/4" headers

Engine made 525hp /530tq. Head porter and engine builder said that I'm giving up 25-30 hp by staying with the CH4B and not going with a Performer RPM, but I'm limited on hood clearance. So that would put me 550ish with the RPM. Your 2in primaries and touch more compression may add a few hp up top. Not sure how the Trick Flow heads flow compared to the ported Stealths but I would assume similar (I'm a little over 300 CFM).

 

[496 polara]

550hp would be my guess. On the street it may like a 1 7/8 header more unless you have deep gears and a stall.

 

[RemCharger]

Back track it from the trickflow dyno mule. It made around 610 620 but with a higher rpm intake and a bit more lift roller cam. 10.5 compression. I would say the upper 500's

 

[496 polara]

I would say around 550-560. I just had my 440 rebuilt and dynoed and it's similar to yours.

Numbers matching '68 440 (stock stroke, 9.6:1)
Stealth heads (ported by KG Engines)
Comp 284 cam (240/247, .507/.510)
Comp Pro Magnum rockers
Edelbrock CH4B intake
Holley 850 carb
TTI 1 3/4" headers

Engine made 525hp /530tq. Head porter and engine builder said that I'm giving up 25-30 hp by staying with the CH4B and not going with a Performer RPM, but I'm limited on hood clearance. So that would put me 550ish with the RPM. Your 2in primaries and touch more compression may add a few hp up top. Not sure how the Trick Flow heads flow compared to the ported Stealths but I would assume similar (I'm a little over 300 CFM).

A street dominator and some 1 7/8 headers would put you right up there.Just the intake swap would be worth a comparison.

 

[70rrclone]

I've wondered if 1 7/8 headers wouldn't be better but I already had the 2 in that were jet hot coated. The converter is a 3k stall and 3.55 gear. A little more gear probably wouldn't hurt.

 

[4mulas]

I wonder if the cam spec you provided are for 1.5 rocker ratio? 1.6 would likely change the guessers HP numbers.

My vote is around 500HP

 

[70rrclone]

Yes the specs are for 1.5 rockers. With the 1.6 i think the lift was .581

 

[dvw]

We've run a similar combo in a Duster with but with box stock Eddy heads and a 3.91 gear. It runs 11.80's
Doug

 

[PRHeads]

I’m also thinking in the 550-ish range.

 

[RemCharger]

https://www.motortrend.com/how-to/440-chrysler-dyno-test-trick-flow-heads-intake/