Post your Super Stock clones
Nice job devnull....what are your thoughts on using the more street friendly (factory) progressive throttle linkage?....just wondering, I have never used the non progressive throttle linkage, but all my Hemis to this point have been in street cars....except the tunnel rammed California Flash. From earlier posts I was thinking your motor came out of a heavier B body that you own and probably have used both linkages.
Thanks HemiDenny. I appreciate the kind words. You are correct, the Hemi came out of my 4000lb Road Runner. I must say that I am very happy with the way the 1:1 linkage performs on the street. It is really very streetable and super easy to tune because the carbs are identical and perform the exact same functions. I actually get "decent" gas mileage with a 572ci Hemi with 2, 650 cfm 4s - in the low teens (I have a Dana with 4.30s and a GV overdrive). It's definitely more efficient than my 493ci Wedge with a Holley 4150 1050 cfm single 4.... as long as I'm light on the throttle. :) I have a wide band O2 sensor in the Road Runner and I used that to tune and study the AFR for the carbs on the street and at the track. I had another advantage with it too. Tim Banning designed and tested the setup - it is his stock "street" config - and he's put a lot of time dyno tuning this setup over the years. So it was dialed in before I got my hands on it. FYI- the Edelbrock carbs are very fat from the factory. My carbs are jetted down about .010 (10 jet sizes from out of the box) and have larger metering rods restricting more fuel.
I've driven a friend's 69 Road Runner with the stock progressive setup and I think I'd prefer what I have. I found his to be hard to start and very finicky until it warmed up. That's only one data point but its all I have. Its apples and oranges too because of the different intake design, and I'm making some assumptions but here's my thoughts on it. My intake is a single plane with a plenum connecting 8 runners whereas the stock intake is dual plane. The progressive linkage was designed with the dual plane in mind. Each carb has a different role in the stock configuration. For my setup, the carbs are identical. I have the same metering rods, same jets, same linkage, same accelerator pumps, and identical settings in both because of the symmetric nature of the intake. So if I make a change, I simply do the same thing to both. I still have a lot of variables to contend with but I think its less than if it was a progressive linkage with different functioning carbs. For example, I've found that tuning my old six pack was a major PITA because the end carbs behave differently than the center carb. Too many variables... My current setup is really easy to tune.
On the street, It's a dream. At the track... I was pleasantly surprised too. I wasn't sure how well the Edelbrocks would work in tandem. I'd always been a Holley guy. In my 4,000lb Road Runner, the Edelbrocks were deadly consistent with 1.37 60's and trapping at 135 mph. They really work well. That's a almost .10 quicker 60' than my best with a Holley 4150 series carb. I have a street tune and a track tune. I simply change 4 jets and 4 metering rods and I'm done.
I don't know if my rambling response/brain dump is helpful but those are my thoughts. :)
