I did some work on my Six on Sunday, Retorqued the heads, played with the carbs... Options

[ClayPerrine]

And took the burscht exhaust off. Replaced it with a stock 911 hotdog muffler.

I LIKE the sound of the factory muffler. Much more civilized, but still has a good growl.


Anyone want to buy a ceramic coated Burscht for a six???? Make me an offer. Has some oil stains on it from my leaky old motor.

[charliew]

Check the timing at the misfire rpm but it could be a little lean as it sounds like you have been working in that direction. You might try advancing the timing to see if it corrects or improves that problem. That probably won't be the fix but if it fixes it at that rpm then you know to find a solution. I'm not familiar with 911/6 motors but timing under load can be finiky but so can afr's. Also make sure the spark isn't weak but it seems that would also show up at high rpm. I once overhauled a holley on a sbc only to find out the coil wire was dissolved inside the cap tower. It actually ran good everywhere but at idle and low rpm under a load.