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Some added information that might be helpful in your decision. The leaded fuels back in the day had 2 grams of lead per gallon. When I was making my decision on what fuel to use I called up VP Racing Fuels since they have a leaded station near to me. They said that their leaded VP110 had 4.0...

I bought my 1972 Road Runner GTX in 1993 and have used Sunoco unleaded ethanol free 90 octane. 31 years later there are no problems with the engine and it runs like new. The 440-4 has low compression so I don't worry about a higher octane rating. My owners manual says to use the leaded fuel...

I can't speak to TTI. I wanted the original sound and look for my 1972 Road Runner GTX 440. I ordered Accurate after talking to them on the phone. I ordered a complete system. I am very happy with the installation, the look, and the sound. The installation went perfectly. It went right in with...

You should give Flowmaster a call. I looked at their website. They have plenty of catalysts available; prices are just above $100 to a bit over $200. Some are on sale now. A few detailed descriptions say they are for 1966 and later vehicles. Anyway, they seem to have a demand for catalysts on...

I investigated adding cats to my 72 Road Runner but since my car is 25,000 miles and never restored I decided to go with an Accurate exhaust which is pretty close to original. So a couple of thoughts: cats work best when they are closest to the exhaust manifold. They need to get as hot as...

It is the original Holly carb. It has been rebuilt several times over the years. Last time in about 2018. Probably only 2,000 miles ago.

Wow, Thanks for the three quick replies. So some answers: 1. no I have not pressure tested the needles and seats as I thought the rebuild would have handle that but I can have it checked. 2. fuel used is Sunoco ethanol free unleaded 90 octane. 3. Fuel pump check valve-yes, I had thought of that...

I have a 1972 Road Runner GTX that runs great, except when it sits for longer than a day or two. It is a well-kept original car, original carburetor, the engine and trans have never been opened, etc., less than 30,000 miles. The last time the carburetor was rebuilt was in 2018, and the fuel...

Thanks, that's sort of what I thought. No stumble or hesitation at all. The carb is a 4 bbl Holley 4160 which would have been the original carb for the 440-4.

A few years ago I installed a Delphi fuel pump for my 440-4bbl. It runs fine. No issues on how I drive it-mostly for causal drives or to car shows a few times a month. 60 mph tops. I brought the car in for it's annual checkup and the mechanic said he thought the pump pressure at 4.4 psi was too...

Just got my third set of Diamond Back tires. They use current production tires. I have had them do 5/8" WSW, 2-1/4" WSW and 3/8" Red Lines. Very pleased with all tires. They balance up with minimum weight, ride very well just like a modern tire should.

Thanks. It looks like it should be there. I'll try the two sources posted to see if they have any in stock.

On the '72 Road Runner 440-4: I have been told that I am missing the heat/sound insulation between the valley tray and the intake manifold. It is supposed to be a fiberglass and aluminum insulation that fits between both. Is this correct and does anyone make/have this art? I can't seem to find...

What's your opinions of the Champion RJ 12YC plugs as compared with the NGK BR6S. The Champions are in the car now and AutoZone does not have those only the NGK. Any opions or another plug. No racing, just starting, driving and cruising. Thanks.

Great and Thanks! I guessed it was about 3/8" from the photo.

If you would do that, i would really appreciate it. I am in no rush, the car season here is just about over. Thanks!

1972 Road Runner came standard with whitewall tires. Does anyone know the whitewall width? In the early to mid 1960's the tire industry width went from 1" to 7/8" to 5/8" (in general.) But what was it in the early 1970's? I'd like to come as close as possible to a correct looking tire for my...

I have used Andover Restraints.They have a variety of belts and buckle styles and colors (if you need something other than black. ) i have been very happy with them.

I always put in 7 quarts in my '72 440

I don't have a Hemi owners manual, but I do have a 1972 Plymouth Road Runner owners manual. For the 440 at 32+ degrees 10w-30, 10w-40, 20w-40, 20w-50, 30 are all acceptable. For maximum performance driving 20w-40, 20w-50, 30, 40 with Mopar High Performance Sulferized Ester #3683842. I use...