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525-550 max. I have seen 480-500 out of a 440 with unported 440 Souce heads at 9.3:1

I would replace the 5 leaf spring packs with calvert monoleafs or call ESPO and get a set of factory 383 springs, which is not what is in your car. My GTS has the priginal staggered spring packs with an extra leaf on the passenger side. Factory clamps on front segment, no snubber. QA1 shocks...

Better get it used up ASAP!

And to the naysayers on the progressive...what else has remote bottle pressure, delay adjustable window switches, etc. for that price? It's not about the progressive function. Its about simplicity in wiring and making sure bad things dont happen unexpectedly. Just one guys opinion : D (from...

I control timing with the MSD box. It is hard on the car to burnout and stage with 25 deg total advance. If you run 30 ish for a 150 shot it isnt too bad.

5. Having a way to dial back the timing from the cockpit is very helpful. With a 175hp nitrous tune up say we use 25-27 total timing advance. If you had 16 initial and 36 total N/A you now have about 6 deg initial rolling into the burnout box. Not a good recipe for success because you are...

I suggested what I did for safety and ease of use. If you don't think you need a window and WOT switch on a nitrous car you are an idiot or don't have much experience with nitrous. And if you do....show your cards or stfu 1) Progressive supplies safety measures above. 2) AFR monitor is a...

I would strongly suggest that you wire in a NOS mini progressive (about $200), if anything for the RPM window switch capability. Add a WOT switch between the controller and the activation button for the kit and you will be good to go. I also think a bottle heater is a great idea. I sell a...

To answer your question, ngk -7 125hp Ngk -8 150hp Ngk -9 175-200hp Ngk -10 250hp Ngk -11 300hp

I dont think champon to ngk heat ranges coincide. In NGK-ese a stock plug is xr5...colder is a xr7 as an example. 300 shot and we are in 11-12 heat range. Again this is NGK land. There must be a cross reference out there somewhere.

Both non projected tip...used n20 plugs on the right NGK 5238 R5671A-9 Racing Plug Plug on left is an Autolite 405.

Non projected vs projected tip

I'd use some MS109 for certain. No octane boosters for this guy. Those plugs do look like non-projected tip. As far as RPM range....how far do you expect it to fall back between gears shifting at 6k? I'd hope it stays above 4000? Forgive me, I am a 4-speed guy so there might be some...

I would top it off with a splash of 110 leaded until you get the hang of things. You need to switch the plugs out to a non projection tip. I would have to look up the number for a 5/8" extended reach plug. NGK is your best bet. I would waint to turn the kit on until at leasr 3800 rpm. You...