drifter wrote:Hey KEITH i emailed you a few times now about this combo using the melling cam and i have gotten no reply.I wanted to ask a few more questions since you have built a bunch of these towing combo's.My first question was with the added compression and cam lift do you have to do anything to the stock quadrajet carb? What about going 1 heat range lower on the plugs from stock is that needed? or not really How many miles do you guys like to see the customer put on an engine before he hooks up his 6000# trailer and starts hauling?
Hi, I did not see the email. I'll check the junk or spam folder.
Start with the q-jet as is and go from there. You should have plenty of vacuum and a good idle. If it's a worn out tired Q-jet, you should rebuild or replace it. Secondary air valve adustment is important.
It will run well with an out of the box Holley 600 vac sec and minor tuning. I usually replaced the carb because it's just easier and ultimately cheaper to start with a new carb.
Use the regular AC 45 heat range or equiv. You can use the 44 heat range for extreme service, but I don't think they run as well.
Break-in? A few drives to sort things out, make sure there are no leaks, get the timing set, right make sure the cooling system is o.k. etc...