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Post by stickshifter on Jan 11, 2023 9:06:45 GMT -8
Here's something I have been working on. Rod spacer The idea is that it allows you to do a couple things: 1) On a 4.0L stroker, you can buy cheap(ebay) 6.125 rods and use them after you get the crank ground from 2.095" to 2.000". This allows you to stroke the engine a little if desired, add a nice radius to the journal, and run what ever piston you choose. The SBC rod is .940" wide on the big end while the 258/4.0L rods are 1.065" wide for a difference of .125". The spacer are ground to .120"~.124" to set the proper side clearance. The standard rod has a .927" pin so it is easy to hone that to .931" if you want to run a standard 4.0L replacement piston. I will be going this route with my 4.8L stroker build for my Eagle. 2) On the 304/360 the stock crank pin is the the same size, 2.095". With the spacer in between the standard SBC rods, the rods are centered in the bores. The journals can be widened a bit to get the total width to the desired size: (2 x .940) + .120" + .014" = 2.014" The stock width varies but is usually about 2.00". Adding just a little width allows the crank to be cleaned up and again to help add a nice big radius. About the most you can gain in stroke is about .030" ~ .040", depending how nice the stock journal is. The ID of the spacer is finished to almost the exact size of the journal. That can make them a challenge to put on and together but the will not be going anywhere. And yes, I have done the math and even did some testing on the design. I am 100% er, 99% confident that this will work as planned.
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Post by spud on Jan 11, 2023 10:20:08 GMT -8
Wow. I wish i would have waited on this. Fantastic idea!
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