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  #1 (permalink)  
Old 05-28-2016, 09:36 AM
vtwinbarblaster's Avatar
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Join Date: Sep 2005
Location: gilbert, az
Bike Year, Make, Engine: 1975 Harley FX shovelhead
Posts: 26
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shovel big bore upgrade

A few months back, I came across a deal on some parts that were for sale, which were a set of S&S 4-1/4'' flywheels, 1970's 74'' Harley rods (( there was a reference made after i googled the part# on the rods, indicating these rods were slightly longer, and had some old school vibe for the reason behind using them, i just cant recall what was said about them at this time, just thought i would mention this in case someone knows what i am trying to describe, either way, no big deal at this point )) also a set of 3-5/8'' pistons, and big bore cylinders. the fly wheels, rods, and pistons were assembled when i bought the parts, so after driving across town, i ended up paying $250.00 for everything.

The timing couldn't have been any better, because i just split my big bore Delkron cases, due to unexpected rear rod bearing failure, (( i was still using my old 74'' flywheels and cylinders, etc, at the time )) i did not want to sink any more money than i had to in order to repair the rod damage, as i had been planing to buy new parts for big bore upgrade at a later date thinking i would get by for a few more years until the bearing issue, minimal downtime was my goal at this point, until i bought these parts, now i plan on installing them, even though the parts may not be the highest quality like the cylinders, pistons, etc (( other than the S&S flywheels )) i still think for $250.00 vs $2500.00 for new parts, i can live with the difference in quality in order to achieve my intended goal for big bore upgrade.

what options or thoughts on the best way for stock cylinder head chamber enlargement required to accept big bore cylinders, can this only be done with a vertical mill? or are there other ways this can be done?

Thanks.
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  #2 (permalink)  
Old 06-07-2016, 06:45 AM
Tortolabob2's Avatar
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Bike Year, Make, Engine: Pro street 121" TP and 100" rigid Shovel
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Do not try this on your own. Send the heads to a shop specializing in Shovelheads. It is real easy for them to do this procedure quickly. You may want to consider larger valves and new springs at this time too.
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