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Old 06-15-2026, 11:37 PM
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slowbird slowbird is offline
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Quote:
Originally Posted by Mike Davis View Post
You could try some Hy Guard tractor fluid to tighten your current converter and see how the car responds. Changing from TYPE F to the Hy Guard changed my 8" PTC from 5200 RPM to 4700 RPM.
Just curious, did your car go faster with the converter being tighter?

  #2  
Old 06-16-2026, 09:07 AM
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Mike Davis Mike Davis is offline
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Quote:
Originally Posted by slowbird View Post
Just curious, did your car go faster with the converter being tighter?
It was .09 slower, with .05 of it being in the 60ft. I used the standard Hy Gard with a qt of Type F for color. The car did pick up 1 MPH and firmed the shift.
I was seeing if my converter was too loose for the combo. Apparently Lane at PTC got it right first shot.

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65 GTO, Tiger Gold, Nostalgia Super Stock 421, 2-Carter AFB carbs, Stock Suspension, 3550lbs Full Exhaust-- 9.70's@135

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66 GTO 389 3x2, 4 speed, 3.90 gear, Montero Red 33K original Miles
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  #3  
Old 06-16-2026, 09:24 PM
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Mike S Mike S is offline
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I am just going to leave the 8" converter in. Love the way it launches now and have the reaction times where I want them.

I will be going back to a restrictor plate under the carb. I was using them under the 1050 and worked but now have an 850 so need new plates.

Would love to soften the middle of the run but don't want to use a timing computer, want to keep it old school and simple.
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