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Hi gents!

I'm new to this forum, but I've taken advantage of all the info in it for my current project (rebuilding a 76 GL1000's engine into a performance engine, and then performing a "heart transplant"), and to troubleshoot small problems on my main ride (75 GL1000 turned into a cafe racer).
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While I figure out a way to split the /$%$/"% cases, I'm working on some performance mods. I've already shipped my cams to get them ground, I got a set of Weber 40idf carbs (which I'll be adjusting once all is done), I've welded together some decent intake manifolds, and I'm running some straight pipes with baffers as exhausts.

I now want to do some porting work on the heads. I don't have a flow bench, so I won't go all crazy on them, but I've read a lot on porting, and I identified a few areas that could need some work:

1) Port matching: Not much needs to be done, but the custom manifolds aren't perfectly matched. 0 risk

2) Work to the valve guide and surrounding area: I want to make it slightly thinner (like a wing shape), and slightly enlarge the tunnel surrounding it (see picture below) (also it's dirty as hell, I'll clean everything up!)

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3) Eliminate what seems to be valve shrouding under the intake valve (see picture)

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4) Do a 3 angle valve job with some Neway style cutters

Are the areas I identified worth working on? Keep in mind that I do it mostly for fun. Also, (especially for those who did it before), will working on those areas (especially areas 2 and 3) put me at risk of piercing a cooling channel and scrapping the heads? Should I be super conservative or forego areas 2 and 3 altogether?

Thank you all!
 

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I would leave any area next to the water jacket alone, not a lot to work with there. Some tapering of the valve guide area is all I would do.
 
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