Roller Cam Specs for 340
Thank you for the recommendation, is that Hughes cam a flat tap or roller? And sorry, what do you mean by my 255's being the limiting factor?
Flat or roller take your pick, the cam I suggested is not a catalogue cam. It's just a target. Or it's a custom.
As for the tires, 255s are, well, pretty small for a stout 340. Anytime you lay on the throttle in first gear, they are likely to spin, which, if you are going around a corner, that is pretty much guaranteed to put you up on the median.
I gotta tell ya, spinning out in traffic is a lil hair raising, especially the first time. I broke a couple of aluminum wheels before I installed 275s with similar but less violent results.. For my combo, this did not stop until I fit the 295s.
Btw, when yur sliding sideways, the brakes do not work, at all. lol. But, I found that 295s on 10s at 24 psi, provide a generous contact patch, that when I stuff it in neutral, it acts like locked brakes while sliding, and then, as the speed comes down, the tires get grip, and then I can steer out of trouble.
I highly recommend that if you run 255s, don't try drifting, lol. They'll drift and slide just fine, but if you get just a tiny bit too aggressive on the throttle, you will spin you out. Along the same thinking, Do not run a VS carb. especially not a 750VS. Maybe a 500 AVS might be ok. But if you want to control the throttle in first and second gears, around town, a VS is out, and Ima thinking, a 650DP is borderline too big to learn on.
Bottom line is this; 295s can save yur azz. You need them, so you might as well start with them. and if nothing else, I would install slapper bars and if on factory springs, HD 3-way shocks on the back. Which will provide a stable/predictable platform when entering a power slide. I highly recommend that the tires be spinning already, when you begin your slide, lol. else your arms may not be able to keep up when she lets go back there, lol, sometimes it gets pretty busy in the Driver's seat.
For my Driving habits, Notta a chance could I survive on 255s on the back of my 68 Barracuda.... unless maybe I had a tired old 318 2bbl, lol. I wouldda totaled that car decades ago.
255s belong on the front, lol. But, on the Street, I find 235/60-14s adequate for some 80/90% of the time.
I'm not telling you that you should run 295s on the back.
I'm telling you that the day will come that you will wish that they were back there saving yur azz.