Guess The Compression Ratio

moper said

What do your plugs look like? It sounds to me more like you are a little lean on full throttle. Your timing is conservative. Which may be a good thing. You really dont want to detonate with those pistons. What is the cylinder cranking compression? My guess is it will be close to 180 psi. Try jetting up 4 sizes on the main jets, or down 2 rod sizes on an Edelbrock with the same jet.

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Thx Moper. Here are what the plugs look like. The pics came out a little lighter than actual, the brown is a little darker. I couldn't turn the flash off on the camera. Looks like I was a little premature on my previous post, pinging is still there at WOT only.

1st pic - cylinders, from left to right, 1, 3, 5, 7

2nd pic - cylinders from left to right, 2, 4, 6, 8

Does it look lean? I will get down to rejetting the carb next weekend.

Thanks - STAN