You will get a hotter spark,more complete combustion.
If you ever seen first hand between a stock HEI spark @ the plug & compare it to the multiple sparks of the MSD unit,I think you will most likely buy one from that comparision alone.
You could make more power & better mileage w/an MSD unit installed.
I know of guys running there stock HEI units on there Syclones & Typhoons that when they run a methanol injection system, it is causing there spark to blow out, then to reduce the tendacy of the spark blowing out they will close there gap down to as much as .022".
I to, use the stock HEI unit on my Syclone & run methanol injection, but I just added a MSD6 box, I never have to close up my spark plug gap & I run 24 psi of boost pressure & spraying a lot of methanol.
Features •With Soft Touch Rev Control • Higher output with 530 primary volts and 135mJ of spark energy •Efficient components use less current to produce more power •Set an rpm limit on the 6AL with two rotary dials •Same bolt pattern as the original 6AL with a lower profile housing •Built-in LED for system checks
I would not say you are pretty close w/your ideal A/F ratios until you install a wide band set-up. You will be in for a surprise.
Narrow bands are really an inferior product as compared to the wide band.
