MSD timing knob for NA motors..
 

not the boost refrence MSD knob the one for NA motor set ups.. I was thinking when I spray my car instead of poppin the hood & bustin out the timing light I would twist the knob.. my buddy has one on his EFI car and it works ok for him.. plus I could turn the knob back to start it too right.. what about Top End say pull timing out of the engine with a twist of the knob??

Just an Idea BTW my car is Carb'ed

Instead of using the rheostat, just install a timing retard module from MSD. It has a start retard function built in, plus three progressive timing retard settings (uses the chips). When I activate my converter lockup in third gear, I have it pull some timing from the motor. Stick guys could easily put a little microswitch on the shifter so when they hit fourth gear it does the same thing. Pulling a few degrees of timing at the big end does help.

I have this installed in addition to my MSD ignition box. There is four stages you can preset and activate with the flip of a switch. You can also set the prestart setting. I think this is better because when your racing, you don't have time to trun a knob to the exact line you desire. With this, all you do it hit a switch and you get the timing you want always. I set my distrubitor at 18deg and retart it down from there. This way, I don't have to use a timing light all the time just to tune it.

Part number : 8975

http://www.msdignition.com/images/8975.gif

I like the reostat, I have had mine for 5 years. And for every reason you think. Also it helps straiten the idle from time to time.

how much does it help to Pull timing out at the Big end of the track.. more mph i am sure but what about ET? i have a 5 speed so your saying when I hit 4th it will pull timing out, hmm how much do you know to pull back?

Trial and error. The amount that I pull out in lockup varies from 0 to 4 degrees, depending on track and weather conditions. Its an old racer's trick, but it works. On my combination I'd say its worth about 1.5mph and .02-.03 in the quarter.