This from Ma Mopar. The math suggests that they think it is 35 hp difference between a 4 bbl and 6 bbl.

Thanks Russ for the info, I got to thinking about the one we dynoed , it had headers on it,that would explain the little bit more HP

I've seen 8 to 12 HP changing from a low deck six pack intake with stock type 440 vacuum carbs.(720 HP to a team G 4500 low deck intake with a Holley #9375 non HP 1050 CFM carb. that made 708 to 710 HP on my old 518 C.I. pump gas motor

I'd agree it won't change MUCH but maybe 1-2 MPH in some cases, and you can definitely have too much and slow down.

This article kind of shows that off pretty well, not huge gains from the gears, and 4.30s slowed the 440 car down (trap speed) until they put some taller tires on.

http://wildaboutcarsonline.com/members/A...num_440_1-7.pdf

This seemed to be very common to have multiple passengers and equipment, does anyone know why the heck they did that?

Look at pass 2 to pass 3, both cars. There is your comparison. Both cars picked up in the last pass. Money says a better cool down and better air is the reason. Maybe better driving too.

I've done this many times. Watched others do it. Raced against the same guys all the time that tried it (this is very interesting). The outcome was always the same. If there is any difference, it is likely because of some other factor.

Re MPH vs gearing, the difference between 3.55 and 4.10 when my car was in the 12s was negligible. It ran 12.4 at 112.7 with 3.55s and 12.2 at 112.7 with 4.10s. The MPH only changed when the tire & gear combination resulted in the engine over-reving, and then it dropped off by 2 to 3 MPH.

When I first put my 440 together to go into my satellite back in 1981, when I really had no clue as to what I was doing, it was a fairly stock build.
Block just got a skim cut, bored .040 over(no plate), I used the correct 2.030 c/h pistons, heads looked okay(to me at the time), so they just got cleaned really well, valves wire wheeled and lapped in, and new springs and retainers to go with the Crower Monarch 280H cam I bought for it.
280/280, 224/224-110, .460/.460
Original Torker intake and a Holley 650DP, exhaust manifolds hooked to a new stock replacement Maremont dual exhaust for a 383, because the 440 H pipe wasn’t available.
12” converter, 3.23’s, G50-15 Kelly Springfield SuperCharger tires....... best ET was a 14.04. I think it broke into the 99 mark, but I don’t remember the speed for sure....... other than I know it never broke 100mph.
Shows about 265hp on the morose chart.

I fell into the "need deep gears!" trap at an early age. I blame it on a Chrysler Power article that had a chart showing progressively faster e.t.'s with deeper gears. Went from 3.23's to 4.56's behind a solid cammed SB in my Cuda. Car ran identical e.t. and mph. ...but with a lot more rpm on the street! Promptly pulled the 4.56's and sold them a month later..

i found a 1967 hot rod magazine road test of a '67 r/t 375hp 440, auto, 3.23 rear; 14.91@93.16mph.

You can find a lot of the 1/4 mile times from various old magazines here:

http://roadtests.tripod.com

i'm going to include this test although it's not a 440 car. it's the 1968 hot rod magazines test of a '68 383 4spd 3.55 rear road runner. I remember gobbling up this article in early '68 and actually bought my first new car, '68 road runner, based on it. 14.74@98mph.

My dad has always told me that his '69 road runner (bone stock, but driven hard) w/ a 383/727 and 3.23 gears would run right beside every 440-4V car he ever raced. Two in particular were '70 cudas, both U code 440-4 cars.
Stock vs. stock, I don't doubt it. Start throwing parts at em though and cubes are king.

Makes sense when you consider both used the same cylinder head, cam, and similar induction. The 440 will just turn less rpm.

Good friend of mine had a drag car w/ a 440 w/ a decent solid FT cam, M1 intake, dominator, and stock 346 heads.
He wanted to upgrade to a 493" stroker, but didn't have the money for heads so we put together a good 493" bottom end, but reused the cam, heads, intake, etc.
It ran 7.30s in the 1/8 at 440".
It went 7.20s at 493". Converter was a lil tight w/ the 440, pretty sure the extra stroke just made better use of the tight converter.

I thought this was a pretty good read:

https://www.greenval.info/horsepower---fact-or-fiction

that's a very good read.

I remember back in the day we'd go to the track and run our muscle cars in pure stock. my road runner did 14.40's on a bad day and 14.20's on a good day. speeds were between 96-98mph. the gtx's and r/t's with the 440's were about 2-3 tenths quicker and a couple mph faster. traction was very difficult no matter the car. we probably ran the engines too high of rpm, over geared them, and whatever else dumb thing we could do; we simply didn't know any better. think what we could do back then knowing what we know now.

Good friend of mine had a drag car w/ a 440 w/ a decent solid FT cam, M1 intake, dominator, and stock 346 heads.
He wanted to upgrade to a 493" stroker, but didn't have the money for heads so we put together a good 493" bottom end, but reused the cam, heads, intake, etc.
It ran 7.30s in the 1/8 at 440".
It went 7.20s at 493". Converter was a lil tight w/ the 440, pretty sure the extra stroke just made better use of the tight converter. [/quote]

Had a good friend do the same thing with a 351. Stroked it to 393", got a new custom ground cam from Bullet but, kept everything else the same including the factory iron heads that he'd worked over himself years before.

I was at the track with him during it's maiden voyage with the new motor. He did not tell anyone until later that day what he'd done over the Winter. As far as we knew, he just freshened the motor. He was all over checking floats, timing and etc. He was frantic and not happy. Car went from 7.50 to 7.38 in the 1/8.

Everyone had the same thought, he simply reached the limit of what the heads could do. A set of AFR 205 aluminum heads later and the thing picked up almost a whole second in the 1/4.

Very good ! Thanks

i fell into the deep gear trap as well ! ran 5.38 gears for years in my charger. that was fine for NU-BE drag strip and stoplight to stoplight, but cruising on the highway was a drag [pun intended ! ] put in 3,91's and it ran the same, but without the super high rpm's.

Which TRW's did you use?