Here is the holley

So if each carb flows 238 at 28" and my intake ports plow 390 cfm at 28" and the maximum CFM requirement of the engine is under 1400, what does that tell me?

It should tell you it makes power with that set up with either type carbs
Real tire spinning power
I cut my hot rodding teeth on a 1934 Ford Pickup that had a stock 1955 Chrylser 331 hemi New Yorker motor in it when I bought it with a little bitty tiny pipes real restrictive dual exhaust system with stock exhaust manifolds, I changed all of those pieces later and had a really good time learning with that hot rod It ended up with 2.0 inch primary with 3.5 inch collectors headers with a home made insert mufflers and a dual AFB carb set up I was able to whup on most of the local factory hot rods including 360 HP Sting Rays and the 1966 375 HP Chevelles
BTW, I'm jealous of your Plymouth
Have fun, sorry for hijacking this thread

2bbl carbs are traditionally rated at 3” Hg, preferably wet.
3” Hg is 40.79” H2O.

238@28 converts to 289@40.79.

289x.92 for an approximate wet flow rating is 266.

266 x 8 carbs = 2128cfm @3” Hg

4bbl carbs are rated at 1.5”Hg, which is 20.4” H2O.

238@28 is 203cfm@20.4, x 92 = 187cfm

187 x 8 = 1496cfm, calculated wet flow @ 1.5”Hg.

So, about the same as a pair of 750’s.

468” @ 7000rpm, @110% VE is 1043cfm.

Good stuff, thanks!

On the roght of the cockpit are a pair of Innovate MTX-L air/fuel ratio gauges. With 8 carbs and 16 main jets to keep track of and get dialed in, I consider them essential. I still did some plug reading to verify results. The plan was to use the in car Gopro camera to record the gauges, and use it like a data logger. But there must be some incompatibility between the shutter speed of the camera and the cycle speed of the gauge display, be cause even though they are reasonably steady and readable with the naked eye, on the video playback is is bad.
When I first started driving the car down the track, everything seemed to move so fast it was kind of a blur, and all of my focus was on getting the car to end of the track. I didn't yet feel comfortable enuff to look down at the gauges at WOT on the big end of the track. So with the camera failure, I din't know the A/F ratio. But then after I got comfortable with the car during drag week, and I was becoming more aware of how the car felt and drove, I started taking a quick glance down just before the stripe. I could see the A/F ratio was in the mid 9's. Way to rich! I think about 12.7 - 13 is best for making power. So I started leaning out the mains a little at a time, and as I did, the MPH was going up. But at the same time, my E.T. was falling off.
Eventually I realized that as I leaned out the mains, an off-the-line bog was developing, killing the 60' time.

It’s too bad the camera didn’t work.

It would be interesting to know if the carbs were just too lean at the beginning of the run after you leaned it out.

That’s a lot of Venturi area to try and activate at a low rpm.

Fast68, I have now solved that problem. I turned the carbs 180 degrees. THey way they were mounted on the X3 intake, they were backwards. It must have been on a boat in its past life. THe fuel was sloshing away from the main jets. After drag week, I made the change, then got out to the track 1 time for testing. It was about 47 degrees, and there was no hook in the track, but there was no bog either. On the 1st test pass I went a new best 60', I think it was a 1.36 or something like that. But it ran out of gas at half track. I should have check it, oops. Then on the next passes, I had tire spin, and my mph was way off. I think my newly remodeled throttle linkage slipped, and I wasn't getting full throttle. I didn't have a helper, so I didn't check that, I didn't think of it till the end anyway.

Makes perfect sense.

Looking forward to what you find on the dyno.

I hate Murphy messing with us hot rodders and drag racers Some times we are our own worst enemy
Welcome to our world
I'm glad you are getting positive results
You might want to compare the new best time slip before it ran out of gas with a old time slip up to the 660 clocks,1/8 mile, to see how much better it was running and go from there
Mopar Hemis rule, no matter what version

Fast68, There is not any race oriented dual quad available for the early hemi. Hot Heads makes what they call a "tunnel ram" but it's not a tunnel ram. I have one, and plan to test it.

Getting back to the story, on Sunday tech day, and Monday the first day of competition there was a lot going on.

These fellas had destroyed their Camaros turbo’ed LS motor, and were changing it out for a hastily sourced junkyard motor in the pits: Even if you hate LS motors, you have to give them credit for resourcefulness and persistence!



Drag Week draws a good crowd. The spectators are free to roam everywhere, that make it fun.


Mike Finnegan was there with his gen 2 Hemi powered, stick shifted 55 chevy gasser, and the raodkill ramp truck with a 700 horse compound turbo Cummings swapped in. How can you not love a guy who puts mopars best motivators into chevies? 9.39 at 147 was his opening shot on Monday.






In the A Gas class, Finnegans rival for the #1 position was also a Hemi powered brand x, Jarrad Scotts 62 Ranchero. He laid down a 9.07 at 155 on Monday. Where else but Drag Week?



Nick Plewniac brought his extra awesome “Dirty Thirty” 1930 Plymouth. I had to get a picture with his 30 and my 31 together. Even though they are 2 different years, Plymouth made midyear changes to the models, so they are the same model. Nicks Plymouth runs leaf springs and caltracks, running in the Super Street Big Block power adder class. He ran a best of 8.35 at 166 before he DNF'ed




[img]https://i.imgur.com/1W5AAF2.jpg[/img]

Jim Forbes, AKA "Squirrel" Made it to Drag Week after an epic 10 month thrash to build his Altered wheelbase AFX barracuda (Or is it a Valient?)
Squirrels build thread







Squirrels car wasn't done when he arrived at Atlanta after the long tow from Arizona, so he was thrashing away finishing last minute tasks. Since the car was completely untested, Drag Week 2018 would be a test & tune for him.



After my 1st pass on Monday got aborted due to launching with the fuel pump off, I rolled right back into the staging lanes without stopping. My dutiful trunk monkey met me in the lanes and topped off the gas. The Hemi Coupe has a little 3 gallon tank for the race fuel, and a 17 gallon for pump gas. I like to race with the street tank almost empty, and the race tank almost full.

Lined up in front of me was Matt Donovans 41 Pontiac. When I pulled up behind it, I noticed the car had a name painted on the deck lid: "Garbage that Barfed".
I thought that was a strange name for a car. Later, I found out that Lohnes and Frieberger, while announcing the race last year, had ridiculed the looks of the rat rod by saying it looked like garbage that barfed. Hence the name on the deck lid for 2018.





The chevy 2 behind me is who I lined up with going down the track. Lonnie Grimm, the Drag Week Warden, had closed the lanes for the morning class car session just a handful of cars behind us. We were among the last pairs before Street Machine Eliminator started. I was so glad that I didn't stop in the pits!
I was extra careful on the 2nd pass not to screw anything up. No way did I want to wait till the afternoon session to make a pass. Reaction dosen't matter at Drag Week, so I took my time staging and launching, making sure everything was right.


Video monday 2nd pass



.

And...............................................

The pass was good, no mistakes, no issues. The time slip said 10.22 @134.7. That was about .08 off my best pass from the day before, but certainly good enuff to turn in and hit the road. I parked in our pit area, and walked to the tower to turn in the slip and get the route info to the next track. The esteemed trunk monkey Jeff got busy on converting the car back to street trim.

When I got back from the tower, I started adjusting the rear coils-overs to handle the extra weight of all the gear in the trunk. Then it started raining. Not too hard at first. We kicked our work into high gear, and headed out as soon as we were ready.

With no wipers or defroster, but a layer of Rain-x on the windshield, I could kind of see where I was going. I was really concerned about getting to the very closest gas station, as I knew there wasn't much gas in the tank. We made it to a station just a couple miles from the track, and by then the rain had stopped. We filled the tank with 93 octane, and 2 cups of Klotz octane booster. That Klotz seemed like some wicked stuff, so I stuffed a paper towel in the plastic measuring cup to prevent any vestige of it from spilling onto our stuff in the trunk.


That is when Brian Kohlman pulled into the station, and parked nose to nose with my car. I was so preoccupied with the weather situation, I didn't even realize the Kodak moment that this scene created. But Kevin from Speed Obsessed saw it and jumped on the opportunity. Thankfully, he put his pictures on the web, where I could steal them!



I moved the coupe out from under the canopy to make room for more cars to come in, then went inside and got a snack. Then it started pouring again. I looked out at the hoodless coupe, and was concerned that too much water could get in the engine. So I went out and covered it with a tarp. Better for me to get too wet than the engine!

I was watching the radar on my phone while I ate my snack, and it looked like we would be clear of the rain in 25 minutes, so I decided to wait right there for it to quit. Brian Kohlman and Squirrel said they were going across the street to Perkins and eat a meal while they were waiting, and invited me and Jeff to join them. They also asked if we wanted to convoy with them to the track. Knowing that neither of them had overdrive, and my coupe has 2 overdrive gears, I declined on the convoy. I figured that we would be stopped by rain alot, so when the roads were dry, I was putting the hammer down! I also declined on lunch at Perkins because I figured it would take much longer than 25 minutes, and I wanted to leave as soon as the rain stopped.

Speaking of Mr. Kohlman, I heard him make his pass while I was in the staging lanes. When this nitro burning monster fires up, there is no mistaking it for any other car on Drag Week!



But this car is still in the testing/sorting phase, and when he got to about half track, I could hear the nitro roar go flat, like it was way too retarded or running out of fuel or something. The announcer told us he had ran 8.61 at 142, way off of what the car is capable of. I was hoping he hadn't hurt the Hemi, so I was glad to see him show up at the gas station.

Who is Brian Kohlman? He's the only insane, Mopar loving, nitro junkie in Drag Week. How many of you remember this famous shot? Same guy!

When the rain stopped, I checked the radar and the route map, and I could see that we would be following the rain for about 20 miles, then make some turns that would get us out of the rainy area. So I allowed 10 or 15 more minutes to pass, and the roads to drain before we hit the trail. Remember, the coupe is running the DOT slicks, I DON'T want to find out how they perform in the rain, because I knew it would be bad.

Most of the racers change tires for the street, and some forged ahead thru the downpour.



Our first leg of the route was on a 4 lane divided highway. Each lane had 2 ruts worn in it from heavy truck traffic, and the ruts were holding a bit of water. Driving with the car properly centered in the lane resulted in the rear end of the car skating around from hydroplaning. So I drove offset in the lane, with the right tires hugging the white line, staying out of the grooves, and was able to confidently maintain 55 mph.

But after 5 or 10 miles, I could tell we were catching up to the rain. The whole highway was getting wetter and wetter. The car was getting very squirrely, and I had to slow down. Slower and slower, until we were only going about 35 mph. I was getting passed by everything on the road, and lots of semi trucks. A couple of them honked their airhorns at me. Then I realized, with all the spray from the tires on this fenderless hot rod, and the 2 tiny 39 Ford taillights, they probably could not see how slow we were going until they were right upon us! Now I was getting really scared. I tried to speed up, but it was impossible to control the car when I did. Fears of getting rear ended by a semi truck had me wanting to get off that road asap. Jeff was scared too, as we both knew our lives were in danger. Pulling off on the shoulder was considered, but that seemed dangerous as well. How far can it be till the next exit, it seems like forever.

After the second honk from a semi, I decided to drive on the shoulder, reducing the chance of getting rear ended. But there was a lot of debris on the shoulder, the kind of stuff that could puncture a tire. Since I din't have a spare, a flat could potentially put me out of the race. I dodged the tire shreds and rocks for about 6 more miles where we finally came to an exit, There we sat for about 45 minutes waiting for the road to dry off. There was another Drag week car there waiting it out as well.

Real tires with slicks for the track next year plus defrost and wipers?

Kevin

Drag Week Rain Video

After I was sure that the highway was dry enuff, we got rolling again to the the prescribed exit, hwy 77 south, a 2 lane road. About the time we made the turn, it started pouring again. I wheeled the coupe onto a semi-rural side street to wait it out. I checked my radar, and it showed that skys were clear just 2 miles away. Should we go for it? What if the radar is wrong, and we got into a situation were we couldn't stop? It was pouring so hard that I could hardly believe that it would be dry just 2 miles away, so we sat and waited.


With Hurricane Florence on it's way, we could be facing a LOT of rain all week. The talking heads on TV said that the towns we were heading for (Darlington, Charlotte) were being evacuated, all the food and water had been cleared from the grocery stores by panicked evacuees, and the highways were clogged with evacuees for a hundred miles, plus the filling stations were out of gas.

But still, after 5 years of effort to get this car to Drag Week, dropping out never crossed my mind. If we got caught in the hurricane, we could take shelter somewhere, I figured. If there was no food, a human can live for weeks with no food right?

And I came up with a plan to deal with the rain. I searched the web for a tire store or a junkyard, where maybe I could get some street tires and wheels, and strap the slicks to the roof. Nothing was nearby, but if we could make it to Darlington, there was hope.

After about an hour, it had quit raining, and we hit the road again, Wouldn't you know, we got about 3 miles, and everything was bone dry! I hadn't even rained there, the radar was right.

The rest of the drive to checkpoint #1 was uneventful, with dry roads and not too much traffic. We got onto a 4 lane divided highway, and I was driving about 75-80 mph to make up time. The Hemi did not like to cruise at less than 2200 RPM, which meant I couldn't shift into 6th until 70 mph.
At 4:00 pm, we pulled into the checkpoint, an idyllic lakeside park, complete with campers, fishing, and people having picnics. I couldn't help but wonder how they all felt about having their tranquility shattered by a constant stream of thundering, ground pounding, race gas exhausting, drag cars!

HJ .... if you play your cards right maybe you’ll have a nice NATURALLY WARM place to work on your junk !