Stock crank and connecting rods - taken during disassembly |
Stock hole in end of 250 crank - needs some threading |
Drilling & tapping the crank nose |
Stock connecting rods with cast pistons - taken during disassembly
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The stock crankshaft will be used but not until after polishing, balancing and the nose is drilled/tapped. The machine shop will use a 25/64 drill bit and a 7/16 x 20 tap (or a similar sizes). This process isn't required in the rebuild and should be done by a shop, unless you have the required tools or a really, really steady hand. The new threading will be used for the balancer puller/install tool and a retaining bolt after assembly. A new CompCams steel timing gear set was purchased but the crank gear wasn't needed as the stock gear was mint.
The machine shop confirmed the stock forged rods were also mint and were needed to balance the the rotating assembly. The weak link with the stock rods are the bolts holding them to the crank. However, if requested, a machine shop can replace the stock bolts with higher quality bolts. Which is exactly what is being done for Turbo Camaro. In this case, ARP rod bolts will be used to make the rods near bulletproof (for this build anyway).
Overall, these two parts are good without any modifications, but a few dollars spent on them can make them great and parts you'll probably never need to replace.
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Turbo | Camaro