Doosterfy
Well-Known Member
Well its taken a long time but I'm finally getting close to getting my 440 Duster running. I have not tuned or raced any cars since the 90s and I have never even driven a big block Mopar, let alone tune one, so I'm hoping to get some input on where to start off. The engine is a .030 over stock stroke 440. It has cnc Stealth heads that have been milled .050 so the chambers should be somewhere around 73 to 75 cc. the pistons are flat tops and it is zero decked so it should be just over 11 to 1 comp. The cam is a Comp solid street roller with .582 lift and 254 @.050 intake and .588 lift and 260 @ .050 duration exhaust. It has an OOTB Torker II intake and a Holley 850 double pumper and no carb spacer to start off because I want to try and keep the flat hood and run an air cleaner. The bad part is I'm using Schumacher try-Ys but I did modify them by upping the collectors to 3 inch and I'm running a complete 3 inch exhuast out to the rear with two chamber style mufflers and Dyno Max race bullets in the tail pipes to act as resonators. I have an MSD billet distributor with mechanical advance and I set it to provide 21 degrees all in by 2500. Obviuosly I need at least 93 octane fuel. My questions are; What initial acvance? I'm thinking somewhere around 15 to give a total of 36. What jets should I start with? The carb has a 30cc acc pump on the primaries and a 50cc pump on the secondaries. The last thing I'm not sure about is crank case ventilation. Is a PCV valve the way to go or should I be running a breather cap in each valve cover with hoses going to some kind of catch cans? I'm also using an MSD 6AL2 box. I've got that little kid on Chrismas Eve feeling in my stomach and I'm hoping to get a good starting point to work off of. Thanks in advance.