I do low gear only burnouts with my TH400 at 3500rpms for about 8-9 seconds then I let off the line-lock and allow the carb to move out of the water. No reason to upshift to 2nd and for sure it's hard on the sprag when you dry the tires off and come out of the water under load. Modern tread compounds don't need a lot of heat to get them sticky enough for good traction. Some need very little burnout at all. I've found that the MT ET Street Radials need the most, and although they work well they don't last long on a car like mine. I'm on my 3rd set and back when I was racing the car a lot more would only get about 40-60 runs on a pair until the tread was pretty much gone. Then I'd get 20 or so really good runs till the cords would start to show.
On a good track 60' times were typically in the 1.61-1.64 range around 2500-3500' DA. In really good air been 1.59 on a few outings but these tires do NOT like cold tracks especially when the air is good and you are making more power.........Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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