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Do stock heads work with the S&S 124 kit? I believe that although not communicated on Fuel Moto site, their 107 to 124 kit requires ported heads.
Fuel Moto has posted several dyno runs on 124 builds with stock heads and good results. Depending on the cam that is being used the valve springs may need to be changed.
Yes, your stock heads will work fine with the S&S kit. Follow the detailed instructions and you will be fine as long as you use a "bolt in" cam.
Also note that the pistons are in the hole and the cylinders will need to be cut to correct this. You will need to measure this depth as they aren't all the same.
Here is a stage III 124" we just did with stock heads, stock throttle body and a new Cycle-Rama torque cam.
Last edited by Durwood 1; Nov 28, 2018 at 11:14 AM.
That went over my head. The pistons are in the hole and the cylinders need to be cut. So this isnt a simple bolt on mod I can do in my garage?
You can just bolt them on and go, however, I have seen them .015" to .019" in the hole. This is something that I feel needs to be corrected and not that big of a deal. I have a local machinist do them for me when needed.
For comparison the stock M8's I have measured were.007"-.008" in the hole. (pistons below deck at TDC).
That went over my head. The pistons are in the hole and the cylinders need to be cut. So this isnt a simple bolt on mod I can do in my garage?
Last 124" set we had, were .023" below deck.
We are beyond equipped/tooled to machine to "0" deck, and we perform those services for other shops as well.
All part of building an engine and checking the details.
S&S 117" Evo engines, are usually -.045", and have seen up to .052", and when establishing 0 deck on those, the spigot also has to be machined to clear.
Piece of cake.
Scott
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