Flywheel for SBC 400 and TH350,,,,

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 I'm gonna be needing a flywheel for my  1955 Chevy with a SBC 400 and a TH350. The engine is from a 1985 trk and the TH350 is also from a 1986 trk but not same trk as the 400 donor. I see where they make a 168 tooth and a 153 tooth,,,??

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desertjoe Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 23 Sep 2013 Location: New mexico Points: 13933	Post Options Post Reply Quote desertjoe Report Post Thanks(0) Quote Reply Topic: Flywheel for SBC 400 and TH350,,,, Posted: 14 Jun 2026 at 6:28pm
	I'm gonna be needing a flywheel for my 1955 Chevy with a SBC 400 and a TH350. The engine is from a 1985 trk and the TH350 is also from a 1986 trk but not same trk as the 400 donor. I see where they make a 168 tooth and a 153 tooth,,,??

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Ed (Ont) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Nov 2009 Location: New Lowell, Ont Points: 1657	Post Options Post Reply Quote Ed (Ont) Report Post Thanks(0) Quote Reply Posted: 15 Jun 2026 at 6:36am
	Make sure you get the flexplate for the 400 engine. They are externally balanced. One from a 350 engine will not do even tho it bolts up fine. Converter will bolt up to either plate as they have couple different patterns on the flexplate.

desertjoe Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 23 Sep 2013 Location: New mexico Points: 13933	Post Options Post Reply Quote desertjoe Report Post Thanks(0) Quote Reply Posted: 15 Jun 2026 at 6:53am
	Well,,Thankee Kindly Ed,,,,!! What is the difference in application from the 153 tooth to the 168 tooth flywheels,,,? Amazon lists both as for the 400 SBC,,,? Edited by desertjoe - 15 Jun 2026 at 7:59am

TedN Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 30 Apr 2025 Location: Central WA Points: 356	Post Options Post Reply Quote TedN Report Post Thanks(0) Quote Reply Posted: 15 Jun 2026 at 9:54am
	If I remember correctly the early V8s used a cast iron bellhousing and the smaller flywheel, and the started mounted to the bellhousing. In later years they needed a bigger clutch so they went to the larger flywheel/flexplate, although they kept using the small one in some vehicles for clearance issues. They also went to a block mounted starter, mounting holes are straight across for the small one, staggered for the large one. Your engine likely had the large one from the factory, and that is what I would put on it. I seem to remember there was something different about the 400 starters but I could be remembering things that aren't true. Edit to add I don't think the 400 ever came from the factory with the small flywheel/flexplate. Ted Edited by TedN - 15 Jun 2026 at 9:56am
	190XTD seriesIII, 190XTD seriesI, maroon belly 7000, 7030, 7045, D14, 190XTD series??? project(or maybe parts)