Join Date: Sep 1999
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Re: REBILDING a 1.3 HEAD recomendations
well, I have made a mistake by using another machine shop to try to catch up with all the orders we get for these SUMO II heads.....I also made the mistake with these kids....
Now I am back to being the Lone Ranger....doing all I can all by myself....so if I am hard to get in contact with..that means I am busy getting parts out to guys in need.
as for the head....those bigger valves work great with the right cam! I am not to happy with a few of those adjustable cam sprockets...seen some wear out too fast. I think some guys think too hard..trying to get all the poop they can from these engines......some things just aren't cost affective (or is it effective?)......
you can (and will) get a head from where ever you want....but I have guys calling me that got one from another shop and side by side they didn't do as well as the ones their friend got from us.....oh, and they paid more for that head......ouch!
I wouldn't mill the head more than .050 and you can get the same effect by making your own adjustable cam sprocket....but all that does is dial your power in at a givin RPM
We (the guys at the machine shop I use) added something to our SUMO II heads.... I am not saying what it is.....but it gives them a little more power and it's included free!