Starter motors
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Basically there are two different starter noses used for the two different diameters of flywheel/flexplates (hereafter to be called '''flywheel''', unless otherwise specified). | Basically there are two different starter noses used for the two different diameters of flywheel/flexplates (hereafter to be called '''flywheel''', unless otherwise specified). | ||
| − | First, the 12-3/4" 153 tooth flywheel uses a starter with the bolt holes across from each other, 90 degrees from the crankshaft. The larger 14" 168 tooth flywheel uses a starter w/the holes offset from one another. | + | First, the 12-3/4" 153 tooth flywheel uses a starter with the bolt holes across from each other, 90 degrees from the crankshaft. The larger 14" 168 tooth flywheel uses a starter w/the holes offset from one another (see drawing below). |
| − | Blocks from about 1962 up are drilled with three holes for either starter | + | Blocks from about 1962 up are drilled with three holes for either starter. In my experience, the only two engines that may be a problem (other than the early blocks that used a bellhousing mounted starter) is the 229 V6 Chevy and the SBC 400. The 229 V6 may have only the side by side bolt holes and not enough "meat" to drill the offset hole. The SBC 400 may have only the offset holes. It ''can'' be drilled for the other hole pattern- but this needs to be carefully done for obvious reasons. |
I have heard rumors there is a cast iron starter nose that has all three mounting holes on the nose. There are aftermarket high torque gear reduction-type starters that have four holes. They are made to be used with either the 153 or 168 tooth flywheel, depending on which holes are used. | I have heard rumors there is a cast iron starter nose that has all three mounting holes on the nose. There are aftermarket high torque gear reduction-type starters that have four holes. They are made to be used with either the 153 or 168 tooth flywheel, depending on which holes are used. | ||
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