I have learned a lot from this forum over the years and have now run into a problem that I have not been able to find an answer to. I have installed a TH350 into my 67 Chevy 2 Nova which required changing to a 168 tooth flexplate, unfortunately, the engine block only has straight across bolts for the starter. Does anyone know where to find the drawing dimensions for the third (diagonal) bolt hole based on the existing two holes for the starter in order to machine a drill fixture? Yes, I know I could use a mini starter with two sets of holes, I would prefer to use a stock starter.
why would a TH350 require the large flywheel? That doesn't make sense. tell us about your torque converter?
Or just buy this drill jig - Starter Bolt drilling fixture Inline 6 SBC BBC 250 292 350 327 283 400 396 454 Chevy
Welcome to the HAMB. Feel free to post your Nova story and photos Here: https://www.jalopyjournal.com/forum...opic-chevy-nova-thread-lets-see-them.1328359/ By the way, 1966 and 1967 Novas' are categorized as a Gen 2 car.
Why a big 168 tooth flexplate? According to the ID codes on the th350, it was manufactured in 1978 and the bolt circle of the torque convertor bolts are on a 11 1/2 inch bolt circle, too big for the 153 tooth flexplate.
What Engine cid ? As in Oem Internally or externally balanced , It sound like a Internally balanced Zero weight on flex plate . 292-6 , 1978 more likely 305,,350 , 250-6 262 , 283,305,307,327,350, You can Bolt up diagonal out side bolt , Square correct to Flex plate teeth , Use transfer punch, then remover starter Drill & tap from Underneath , Or change flex with Multi bolt patterns, Or Drill existing flex plate , Bolt the 153 & 168 together, then transfer convertible holes , add a spacer on each bolt hole on converter , You can use the OEM mini starter From 95- 2001 ish Or race Mini with 4 bolts
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