Eliminating Valve Float
Eliminating Valve Float I am looking for advice from someone who has experience with similar set-ups to mine. I am getting valve float over 6,000 rpms. Below is my current set-up. Need recommendations on good springs that people have had proven success with on similar set-ups. This set-up is currently N/A. May add a 200 shot of nitrous down the road.
heads - PI/Mast Big Bore LS7 heads
http://www.mastmotorsports.com/2010/... - Bare&id=359
intake valves - from Mast Motorsports
http://www.mastmotorsports.com/2010/...=Valves&id=169
I think these are the exhaust valves, I don't believe they are hollow stems.
http://www.mastmotorsports.com/2010/...=Valves&id=161
Lifters = morel link bar limited travel
Rockers - T&D adjustable shaft rockers - 1.8
Cam - 243 247 LSL 112+4 .661 lift
heads - PI/Mast Big Bore LS7 heads
http://www.mastmotorsports.com/2010/... - Bare&id=359
intake valves - from Mast Motorsports
http://www.mastmotorsports.com/2010/...=Valves&id=169
I think these are the exhaust valves, I don't believe they are hollow stems.
http://www.mastmotorsports.com/2010/...=Valves&id=161
Lifters = morel link bar limited travel
Rockers - T&D adjustable shaft rockers - 1.8
Cam - 243 247 LSL 112+4 .661 lift
Last edited by Marble_Sharp; Oct 2, 2011 at 08:40 PM.
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Verdad Gallardo I agree springs are important and I am certain they are the problem. That is why I am looking for input on what springs others have used successfully with similar set-ups.
Sorry to get off topic but how much compression are you running? E85? I am really impressed with the rwhp given the problem. Thats an awesome number to put down by only 6100 rpms. Most guys cant get that even with larger cams. Good luck and keep us informed.
Pump gas - 93 octane.
It is a M6 with 4.10 gears.
I have no "proof" per se but seeing as there are simply not that many spring manufacturers out there the MAST springs appear mighty similar to PAC springs which are very good quality. Considering this;
Im agreeing with above. Ditch those heavy *** rocker arms for some stockers and see how it goes. Its a cheap, fast, and simple thing to start with. If that doesnt do it then lighter valvetrain is probably your answer but still... Lots of guys revving the **** to 7K RPM on solid valves without issues so?
Im agreeing with above. Ditch those heavy *** rocker arms for some stockers and see how it goes. Its a cheap, fast, and simple thing to start with. If that doesnt do it then lighter valvetrain is probably your answer but still... Lots of guys revving the **** to 7K RPM on solid valves without issues so?
I agree with Cam. I had a 6.0 with aftermarket heads, springs, retainers, and rocker arms, and at 6,200 rpms full throttle at track would will feel like a engine miss or skip, real bad on 2-3 shift. Come to find out was valve float, replaced rocker arms with factory rockers and never had problem again.
I would stuggest checking the springs to see what the pressures are first. 150-400 at least is needed.
How was the tune I have seen that cause issues that look like valvetrain issues.
Tim
How was the tune I have seen that cause issues that look like valvetrain issues.
Tim