2006 valvle size?
- Thread starter sics6
- Start date
john sachs
Well-Known Member
All of the EPA S&S 117" heads I've run across have 1.940" intake valves, and 1.570" exhaust valves.
John
John
Yes you should have, i use the same cam. I had my heads ported, polished, new valves 2.02 intake and 1.605 exhaust. Heads were decked 0.030. I also used the comatic head 0.030 and base gaskets 0.010. By doing this I did not have to mess with cutting the cylinders. By using the comatic head gasket I gain 0.013 and 0.010 with the base gasket. That along with the decking of the heads 0.030 bumped my compression to about 10.5-1 which is what I was looking for. I can use pump gas 93 Octane with out detonation issues. :2thumbs:
Carlos
Yeah, Damn I should've got those bigger valves. I might have fucked up by having them keep my valves. I wonder what kinda impact my valves would have on my upgrades? Little boo my compression is being put right at 10.5.1. I'm getting the jugs cut and stuff, heads all cleaned up and stuff, just didn't put bigger valves in. I wanted a torque monster so i went with the w6hf.
john sachs
Well-Known Member
Boo,Yes you should have, i use the same cam. I had my heads ported, polished, new valves 2.02 intake and 1.605 exhaust. Heads were decked 0.030. I also used the comatic head 0.030 and base gaskets 0.010. By doing this I did not have to mess with cutting the cylinders. By using the comatic head gasket I gain 0.013 and 0.010 with the base gasket. That along with the decking of the heads 0.030 bumped my compression to about 10.5-1 which is what I was looking for. I can use pump gas 93 Octane with out detonation issues. :2thumbs:
Carlos
Doing what you did DID NOT do anything to fix your quench.The .010" base gasket prolly took the piston from .040" in the hole to .030" in the hole. Still NOT ideal quench. :bang:
Now as far as EPA heads with smaller valves. I'd rather rework them as I have MUCH more control of valve seat geometry when installing oversized valves. S&S is using old school geometry on their large valve heads.
John
john sachs
Well-Known Member
Depends on what was done to the heads, and the rest of the package. It prolly will make more power, but you may have left a lot more on the table.
John
John, forgot to mention that the heads have the Quench Groves cut in them.Boo,
Doing what you did DID NOT do anything to fix your quench.The .010" base gasket prolly took the piston from .040" in the hole to .030" in the hole. Still NOT ideal quench. :bang:
Now as far as EPA heads with smaller valves. I'd rather rework them as I have MUCH more control of valve seat geometry when installing oversized valves. S&S is using old school geometry on their large valve heads.
John
John I know you are an egine builder and respect your comments, however Mr Woods at Woods Cams enjoy a good reputation himself. I was advised by him as to the gaskets and Head work. Having milled the heads and less gasket brings the piston out of the hole by 0.023. I did not go any futher to avoid the compression increase above 10.5 to 1. Again this combo was what Mr Woods suggested I use with his cam to increase compression from 9.5 -1 and make the cam worthy. According to him this was the ideal bang. I also use the Jim's Hydro-Solid lifters which will not float at above 6000 + RPM. As you well know that having shaved the heads by 0.030 I needed the Quench groves to avoid detonation because of the smaller chambers. Personally, I think I have to much bike for the rider :lol:
Carlos :2thumbs:
Mr4500dodge
Member
Carlos, stick with what Bob Wood suggested. I too purchased my W6HF cam and his 188 valve springs and he told me to use a cometic .030 MLS gasket and I would be just fine. I didn't do anything to the jugs or heads to get me closer to the ideal quench, but Kendall Johnson just dyno tuned my bike last Friday and with a 34 intermediate and 88 main, I got 117 HP and 139 lb ft of torque to the rear wheel. I am more then satisfied with the outcome.
Tomtang aka Reptilejim
Well-Known Member
What's the cost of the head work that you guys are talking about? My rocker boxes are leaking and I'm considering upgrades ( headwork and cam) and that's about it. John are you still doing the heads?
