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Stock junk rules.

I think Chuck means outside diameter. From a personal standpoint I woulda gone to my friendly GM dealer to get the seal.

Race gas is a whole different ball of wax. Racing every weekend in a race series...and hitting the coffee shops...is apples and oranges.

Try race gas and racing every weekend.

I had an AFX WB in my car but it was constantly wanting me to recalibrate it. I knew KR would start to show in my engines around 750 so I just the left the 02's at 770-780. I left it in the car cuz it looked cool.

A quote from Eric. 'Junk in equals junk out.' A quote from Scoob. 'I changed the fuel pump in my car every spring as I figured it was cheap insurance against head gaskets.'

I grabbed an extra pair of GNX style 16 inch rims and tossed a pair of DR's on 'em for messing around at the track.

You're correct. An 8 inch rim with a 4 inch backspace in optimum for these cars.

No you're not...and I'm not gonna pull any punches with anyone. My hunch is Eric sets his fuel at about 70 degrees. 20 years of racing tells me when the temperature gets to about 65 degrees and lower is when I had to start adding fuel. Humidity...cold dry air like yesterday...will suck a chip...

I'm betting dollars to donuts you'll need a spacer like I did. All you can do now is bolt it on and see where you're at. As I said previously, I knew mine would fit with a spacer as Grumpy ran the same wheel width/tire/backspace.

6.1 corrects to 10 percent. 5.7 you can add 20 percent either way...hence why I ran it up here. BLM's are high at WOT but normal at 120 at 820 RPM's. IAT's were 51...prolly underhood air. What was the ambient air temperature/humidity. Let me guess...you don't know. Get your sorry ass out to a...

MT's site say 11.1 for section width...and in brackets it says 8. You're running a 9 inch...which I would think would increase your section width...which means you'll be closer to the frame and wheel lips. https://www.mickeythompsontires.com/drag-tires/et-street-s-s

I recommend buying a Scanmaster.

If you already purchased the rims...then do what I did. Bolt 'em on and see if they fit. If it's on the frame rail then you'll have to play with spacers like I did. I'm fairly certain I had read Grumpy ran the same tire/BS with a shim, so I knew they'd fit.

Just to prove what I stated above, here's a launch pic with the 28 inch slick on the Billet Specialties.

Okay, so I ran the Billet Specialty with the 275/60/15 DR and 28 inch drag slick with both having the same section width and 15x8 with a 4.5 BS with the aluminum drum which is a tad thicker than the stock cast iron...and I required a 7/32 shim to get it off the frame. Lips were not rolled on my...