Did you read the article on Dynamic Compression? Did you download the calculator? Your static compression is most likely around 8.1:1 With that cam, your Dynamic Compression is around 6.6. If you download the calculator and keep it on your computer, you play with different cam specs and actually see how it affects your DCR.
Yes I read that article a lot of info to take in especially since I'm still learning about all this and what it all means. I couldn't download the calculator to my phone so I will have to try it in my computer later on. So to dumb it down for myself the cam that's in it now is seriously hurting my performance and I should maybe go with a 212 from TA??
I would rather you do this for yourself so that you truly understand why this matters. No, I even think the TA212 might be too big given what you have now, but I would rather you make that decision from a position of knowledge. Download that calculator and then set it up on your home computer. I keep it on my desk top because it is so useful. If you have any trouble using it, I will PM you my cell and I'll walk you through it. Once you use it once, you'll see what I am talking about.
Thank you Larry I really appreciate your patience and help/guidance! I really want to learn and understand everything so I can setup everything how I want it and not just throw parts together (money down the drain) or have people do it for me and not know what I'm talking about when people ask " what you got under there" and be embarrassed!
Dang it Larry, if you don't stop helping me out in going to have to name my 1st born Larry or send you some Wine up to New York. I got my chassis manual today in the mail, and I was re-reading your reply on Transmissions on the "going to need better tires" thread today. Alot jewels you'e been dropping in this forum, I come across them from time to time in old threads. Have a great Saturday.
Well I pulled the trigger today and bought myself a fully restored and tuned Qjet 7042240 from Ken at Everyday performance! I would like to say thank you to all of you for your help and to Ken for talking with me today to get all the specs to have it set up properly. She's a beauty!!
These guys kill me!!! The self-professed quadrajet masters, who OWN Buicks couldn't even give me the right base gasket for the carb I bought from them. Then the master rebuilder Mark insists that's what they use. Are you kidding me? ROFLMAO You made a good choice picking Ken.
Well my Qjet arrived today and I must say it's even better looking than I originally anticipated. Great work Ken-Everyday performance thank you so much!! I cant wait to bolt it on and see how it performs. View attachment 385487 View attachment 385487 View attachment 385488
The guys on the board here know their stuff, and their carb work is solid. You won't be bolting some hunk-o-junk to your intake if it comes from them. I rebuild my own cores, and have learned plenty from them over the years. You'll definitely see some improvements over the Holley once you've got it dialed in. Holleys are for Fords.
Does anyone have a vacuum diagram for a 72 Qjet 7042240? I want to make sure I'm putting the right hoses on the right ports. The ports on the Qjet is different from my old Holley 750dp
Here's some annotated shots. If you're tripping on the throttle linkage: it is not factory-stock. I've replaced it with a primary linkage to accomodate the switch-pitch transmission hookup. The one I have marked for vapor collection cannister may not be correct...it could be for EGR . I know it is a vaccum line same as the primary pull-off, and I don't need it for my 430.
There is no correct except for the PCV connection. The vacuum line in the back is manifold vacuum. It frequently connects to the vacuum storage container for the climate control functions. The two connections on the front upper are ported (driver) and manifold (passenger). You can use either one for the vacuum advance depending on your preference. There is no vapor connection on the 7042240. There are a number of ways to hook it up and it will work the same way. Just don’t leave a manifold vacuum port open or you will have a vacuum leak.
