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[prodrag1320]

1) If I bore to 107 as opposed to 103, how much room left for over size 107 pistons will I have?

2) Will there be heat issues boring the stock cylinders to that size due to the thin remaining cylinder sleeve?

3) what static compression ratio would offer good performance, good tuning with reliability and longevity in either 107 or 103?

4) I am not a WOT guy. I never get above 5000ish rpm. What cams would be a good choice for low and mid range?

5) If I went with a 107 or 103 with stock heads until I could do a valve job how would that impact above questions?

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there is no over bore with 107" kits,just like any build if its matched & tuned right there isn't any over heating problem,10.0-1 & S&S 570 cams is a good build,feel free to call me if you have any questions
kirby
www.veetwinbperformance.com

[HD Street Performance]

I stock 103 and 107 KB pistons. The 107 is at the end of what can be bored, the spigot getting thin only. That said the KB LCA heavy duty pistons I have been using run very quiet and there have been zero failures. None of them run hot, including the S&S 110 kit which I can get, if tuned right and set at the proper static compression.
Some discussion here:
https://harleytechtalk.com/htt/index.php?topic=109927.0;topicseen

[Jordan1200]

Thanks

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