Make sure you're using a JIS bit or you'll be chiseling out (or drilling the heads off) the screws later... I've had a Vessel JIS t-handle for decades and recently bought a Motion Pro JIS t-handle as well (with all 3 JIS bit sizes, magnetic), and you'd be amazed at how much torque you can apply to the case screws with the proper-fitting bit and t-handle. I like the look of the OEM case screws and when you have the right tool, they're easy to keep and use
'65 CA77 carb floats don't hold air....bummer.
They do hold a certain amount of gas, though.
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I seriously doubt you'll twist the head off one, but it could happen. Tapping sharply on the end of a metal t-handle while in the head of the screw can absolutely help loosen the slight corrosion on the threads and often be the difference in getting it loose without destruction of the head of the screw. I've found that if you use enough inward force - by getting a good grip on a frame tube or other area near the engine to push inward as hard as possible when you're turning the t-handle, to help avoid the driver jumping out of the cross and thus damaging the screwhead - it makes a big difference, and they will often come loose with a strong "snap" with little or no wear on the screwhead, and a good t-handle will get them as tight as you'll ever need when putting things back together again. I bought a Motion Pro assortment of case screws that replaced virtually every screw in my 450 engine and though they have a bit larger head size, they look good and cost a lot less than buying all the OEM screws one at a time if you prefer the look. Here's the t-handle I bought
https://www.amazon.com/Motion-Pro-T-Handle-Cross-Head-08-0557/dp/B00M9IKK0Q
I don't have a picture of my old Vessel t-handle, but it's in the garage. I'll post a picture of it later with its red plastic handle... it's been through the mill, like your impact driver has been I'm sure
and here's the search result for the screw assortment so you can get the best price
https://www.google.com/search?q=Motion+Pro+Metric+Pan+Head+Screw+Kit+33-0500&rlz=1C1WPZB_enUS639US639&oq=Motion+Pro+Metric+Pan+Head+Screw+Kit+33-0500&aqs=chrome..69i57j69i64.6212j0j7&sourceid=chrome&ie=UTF-8
https://www.amazon.com/Motion-Pro-T-Handle-Cross-Head-08-0557/dp/B00M9IKK0Q
I don't have a picture of my old Vessel t-handle, but it's in the garage. I'll post a picture of it later with its red plastic handle... it's been through the mill, like your impact driver has been I'm sure
and here's the search result for the screw assortment so you can get the best price
https://www.google.com/search?q=Motion+Pro+Metric+Pan+Head+Screw+Kit+33-0500&rlz=1C1WPZB_enUS639US639&oq=Motion+Pro+Metric+Pan+Head+Screw+Kit+33-0500&aqs=chrome..69i57j69i64.6212j0j7&sourceid=chrome&ie=UTF-8
It's a good question you ask... Steve (66Sprint) would be the one who knows that answer. I worked on very few 160s as they were on their way out when I got started at the dealerships
Hence the reason I mentioned the JIS t-handle and (mostly) the bits. Time to try the dull chisel on the side of the screw head to see if you can get it to rotate
It can be challenging and frustrating, but sometimes it's the last best alternative... and it feels great to win! Good job, just like we drew it up :lol:
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