I am considering using the same 268AH cam with my 340, 904 and 3.23 gears. I have power steering and power disc brakes as well. I want this is a mildly hot street cruiser, that the wife will drive from time to time. Am I considering the wrong cam?
OK, just measured comp height, and it's only 1.75". Yikes, that proves that it's 0.07" in bore as well. I calculate 8.23:1 with 0.047 gasket. Did they offer a low CR 340 in 71? So I need new pistons, any reason why I should shop someone other than KB?
Block number is 2780930-340-7
The measurement was 0.07" and you could visually see it into the bore, clearly, where 0.007" would look almost flush.
So yeah, I will have to tear this down to see exactly what I am working with. Virgin bore does not equate to original pistons, as I believe I have found out.
I am using 906...
No offense taken, it's just that many people have info at their fingertips, and just tweak a value or two. I would have to research what the cc's in the piston are for stock, as well as typical deck height, which is never accurate. And so on. Yes, the calculations are easy peasy
Great, I was hoping there would be a general consensus that stock pistons are fine, I was just checking to see if I was missing out a bunch on modern new pistons, which I know nothing about.
So, next question, I have 65cc heads. It will take me some research to see where I would be with...
The 71 340 block is in great condition, and the rotating assembly spins easy. My plan is to obviously strip it down and check everything carefully, but I am not a fan of those stock 10.5:1 heavy pistons. Assuming they are in good shape, should I not stuff it with a modern set of KB's and rings?
So far, checked fluid, which is good. Took it for another test drive. It started to flicker briefly at idle, then I accelerated and it went off. Did not happen again during that drive. Difficult to diagnose with light on, because it is so brief.