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I finally installed my aluminum heads (low 290's cfm) to replace my hand-ported iron heads (doubt they made 250). Now my 451 runs a lot leaner everywhere, around 1 full point AFR. Cruise is more like 15.5:1 but no surging, so that's ok. The idle is now much too lean, showing around 16:1 after...

Regarding possible milling of my intake manifold flanges: Does anyone know what the angle of the intake surfaces on a B engine is? I assume the intake manifold and the head have the same angle so they meet flush. (It appears that mine do not at the moment). Is it symmetric (left and right)? If...

I finally got around to swapping my iron heads (set up with ductile iron rockers and the original stamped steel hold-down tabs). Now the aluminum heads are going together on the bench, and of course the valve gear doesn't line up the same with studs and aluminum hold-downs. My cam has .652...

Recently I found that the power valve on my 950 carb did not appear to be opening at all. I have it tuned for a lean cruise, but now the AFR readings on the wideband do not richen up when the manifold vacuum drops below the PV rating. In fact it gets even leaner and sags. I did punch it once to...

I think my timing curve isn't quite optimal, but I'd like some recommendations. My combo: 451, 10.3:1 hand-ported iron heads, QF with BLP baseplate 950 double-pumper with 1" open spacer on Edelbrock RPM, .652/272@.050 cam, premium pump gas. 4-speed (2.66 low), 3.91 rear (3000 rpm @ 60 mph)...

This project's been going on for about nine months. But instead of a dirt/mud floor, I now have a 4000 psi 6" (minimum) slab and a Dannmar D-7 four post lift. (I actually bought the lift 3 years ago and it's been in the crate until this winter). So 3 days of rain, thunderstorms and maybe hail...

Doesn't anyone make a 15x10 steel wheel (4.5" bolt pattern) with a 7.25" backspace any more? I have stock front steelies with 195/70-14 tires that take a dog dish cap. But my rears don't match the front since they are a widened pair of rally wheels, and are 8" backspace (a bit close on the...

Can anyone recommend a fitting for my nitrous bottle that has two 1/8" NPT female ports? The bottle fitting and main line are #4 AN. I want to plumb in a pressure gauge and an adjustable pressure switch for heater control in the trunk. There are plenty of fittings with single ports like this...

Trying to choose between these two manifolds. Currently have the RPM. Almost all street driving, until I get a 2-axle trailer because the nearest strip is 90 miles away anyhow :rolleyes: Combo: 451, .652 gross lift (272@.050) cam, QFT 950. For now, running bowl-blended iron heads. Will shortly...

I have two 10 lb nitrous bottles (from NOS) that appear to be in perfect condition but way out of date. One I bought new in the mid-90's, filled a few times, and haven't used since then. Anyway I'll need to get them DOT-recertified before filling. I believe the stamp is good for five years...

I recently put a QF 950 (1.42 venturis, 1.75 throttles) on my 451 and went through a lot of contortions getting a good tune with my big cam. My bowl-blended 2.08/1.74 iron heads probably don't flow much over 250 cfm, but they got me on the road! This winter I plan to put on the PRH Stage 1...

I must be too old, because it's too loud. (More accurately, I prefer to speak softly and carry a big stick) :p Anyhow, my 451 Dart has quite a rumble with headers, dual 3" with X-pipe and full tailpipes, Summit "turbo" mufflers in the stock locations, and glasspacks under the trunk floor for...

I know that building lumber has doubled and tripled in price this year (you'd think it grows on trees or something)... apparently, so has copper. I'm going to extend my shop air line a few feet so I can relocate my benchtop blasting cabinet. So I just bought 10 feet of one-inch copper tubing...

Ever since I bought my Autometer 3579 air/fuel gauge via Summit, it has not worked correctly. Instead of starting the engine and having it read within seconds as the sensor warms up, the ONLY way to get it to read was to turn on the key, wait about 30 seconds for the sensor heater, THEN start...

In my never-ending quest for improved idle and just-off-idle manners (big cam 451, 8" vacuum), I'm considering investing in an M/E Wagner DF-17 tunable PCV valve. http://mewagner.com/?p=444 But that little billet piece is $129.99... before I spend that much, I'd like to hear from anyone who's...

I have a set of Hedman 78030 B-body headers on my low-deck, and the issues with #6 plug access are well known. I made a hole in my inner fender so at least I can get a socket on it. Since I don't have a thin forearm with two wrist joints, using a wrench from underneath is not practical...

I have a new strange problem with my big cam 451. Holley blue pump with regulator. Normal behavior: Idles at about 13.5:1 AFR on the gauge at a fairly steady 1200 rpm, 8" Hg. If the speed ever drops below 1000, the vacuum signal also drops and there is not enough fuel to maintain a decent idle...

Got highway gears? :) Good used long-shaft gear. $20 shipped within USA.

I have Contour fans on the 26" rad keeping the 451 cool in my '72 Dart. But they do seem to interfere somewhat with the airflow at low speeds on the street. Since my thermostat is nominally 180, I have to use a 195/185 switch so the fans will turn off once they start (can't be below the stat...

Has anyone used one of these? Price is right and they're selling a lot of them... 3 ROWS ALUMINUM RADIATOR FIT 1970-74 DODGE MOPAR CARS 22" Wide CORE BIG BLOCK | eBay Yes, I know the old adage about getting what you pay for ;)

Do I have enough metal here to drill and tap the primary idle air bleeds? (Not sure what the thread size is on the replaceable jets, but I could use a brass set screw and make my own).

I'm looking for advice on ignition timing of my pump-gas 451 with big cam (272@.050), currently iron headed 10.3:1 but soon to be aluminum 10.6:1. Currently I have 22 initial (starts to fight the starter hot at 24-25). Total is 36, trying to remember the curve but think it's all in by 3000. FBO...

I'm gradually debugging my Dart 451, A833, 3.91 8-3/4. I've discovered a strange vibration only in 3rd gear. Doesn't matter what engine RPM or driveshaft RPM/wheel speed is. It does not seem to get worse with more throttle. Smooth in 1st, 2nd and 4th (straight-through, this is not an OD trans)...

I screwed up big-time... While building my Dart over a 22 year period off & on, somehow I'd forgotten to put the gear oil in my new Dr. Diff 8-3/4, and it locked up yesterday after driving less than five miles on straight dirt roads at 25-35 mph :( Got it towed home, pulled the wheels, drums...

I bought the bare 400 block in 1997, the stripped '72 Swinger shell around 2007... and today at long last, I took it for a short shakedown cruise on the back dirt roads :) No smoke, fire or puddles. Getting the alignment done on Tues., and then I can go faster than 35 mph, and also touch the gas...

I've cut my column jacket back to the firewall (originally a PS car. Now have manual box and Flaming River U-joint/extension). I bought the ER-16 bearing that is supposed to work for the lower shaft support... but it won't go on the shaft! After cleaning up all the crud and rust, and polishing...

(Black) 29 tooth speedo gear. (Chart says 2.76 gears with 25" tire, or 2.94 with 27" tire). $10 plus postage.

29 tooth speedometer pinion. Black gear. $15/obo plus postage from 65775. thanks. Is there more than one? :) This is from an A833 but I thought all our transmissions (727 & 904) used the same type of gear.

Appear to be 68-70 (29-3/16" length), 30 spline, large bolt pattern. Left hand studs on one (LH nuts included). Will need new bearings for sure. $50 plus actual shipping from zip 65775.

Just wondering how much the ride height will lower from new install in a month... a year etc. Is it a linear process or is there an initial settling? thanks.