I have a 383ci sbc and have gone from 9.7:1 to 10.2:1 compression by changing from the old style AFR heads to the new eliminators milled down from 75 to 72cc. I have NGK BKR6E plugs now but the instruction manual recommends BCPR5EY.
Will the small bump from 9.7-10.2 need a change in heat range?
thoughts on A/F ratio or any other info you can read off these would be great.......
Here are some pics that i hope are good enough for you to read. Some are not that good but I think some turned out better.
They are all in fours each pic is either the even cyl's or odds. the odds are the ones with the two corroded ones. They are #3 and 5. Ignore those obviously as they were caused by my porous head weeping coolant.
They go from the right to left as 2,4,6,8 on the better ones and 1,3,5,7 on the pics with the corrosion......
