Have there been lots of problems with these paper thin drop in kits?

 

Ok guys I got in contact with Darkhorse and talked with them for a bit about this. I was told with the kit that I have I can not go with a stroker crank because of the wrist pin location on the piston (that's the short version of the reason). Thanks for everyone's replies. It looks like I'll be doing a 4 inch stroke. Also just so everyone knows I already had this 100ci kit. I got a killer deal on it and jumped. The whole kit with cams, plate, pump, push rods, lifters, jugs and, pistons brand new for $1850. I couldn't pass it up. If theres any problems as I begin to put this back together I'll let everyone know. Thanks

 

We build those to 107" quite often when the OE crank is buggered.
As long at the bore is measured, and the pistons are measured to verify correct piston/wall clearences, a piston swap would work.
That said, the heads will need to be re-worked to match the projected engine combination.
Great power can be had with a 110".
Scott

 

yes,cracked spigots

 

Wow, this is the first I've heard of a widespread problem.

 

All you need for the stroked crank is a different set of pistons with the proper wrist pin location; they are available from a variety of sources; that is if you want more displacement. I would still be concerned with the 8.75cc dome and 85cc TC heads; do the math. That big dome is going to set static CR right at 11:1 with 0.00" deck, .030" head gasket and 85cc chambers and CCP will be above 200psi. Aside from needing a really good tune, compression releases, premium fuel and a cam set with an intake close in the 46*-50* range. Just a word of caution without knowing the details of the build plan.

 

That sounds just about right. My corrected compression should be right around 9.8:1 and yes premium fuel will be required and I have a guy close by that's a very good tuner and he and I have already talked about the overall set up now that I know what exactly I'm doing with the crank. We talked yesterday before the game. I'm know that's a bit high on the compression but, it is what I have and what I'm going to use. Oh and as a side note I have a custom head gasket of .036 so that will lower things just a tad.

 

If you're going to the length of spitting the cases and repairing or replacing the flywheel I would look into machining the cam bearings journals to accept 2007 and up cams. I did this to my 88 when I had it built to a 103. This allows you to select a wider variety of cams in the future. The cost is around $150.

 

I already have the cam chest kit. It came with the power pack from S&S. Outside of catastrophic failure I will not be doing any major work to this once I'm done. So going to a different cam isn't really in my future. Thank you for the idea though.

 

Viper0463. If I step over the line tell me and I will try to delete my post. I think you are to focused on using a good deal kit. I understand that money does not grow on trees. Having a bike in the garage the does not run is the worst and then not having a bike running properly is next. For all the effort you are putting into making your kit to work just put that much effort into a properly tuned parts.Good luck