Higher compression heads now I got falve float
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Junior User
Joined: May 2001
Posts: 86
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From: Southern California
Higher compression heads now I got falve float
Greetings, My 1986 F150 302 efi, C4 manual valve body shorty headers and now highrer compression heads is done. I have valve float at high reves, may this be caused by more HP than the valve springs were ment to take? Do I need to replave them with stiffer springs?
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Junior User
Joined: May 2001
Posts: 86
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From: Southern California
rear end gears
I was thinking that maybe because of the high geared rear end based on the granny geared borg warner that the ratio is causing the problem. Since it is now history and the C4 is just straight forward
More Turbo
Joined: Mar 2002
Posts: 508
Likes: 2
From: Easthampton, Ma.
High compression heads or horsepower have nothing to do with valve float!
Exceeding the RPM limit or weakness of the valve springs causes the valves to not seat quick enough for the engine's speed resulting in valve float (popping, misfireing, or backfireing at high RPM)
Bad, weak or improper ignition components can display the same symptoms.
Talk with the cam manufacturer or your local machine shop as to the correct springs for the application.
Exceeding the RPM limit or weakness of the valve springs causes the valves to not seat quick enough for the engine's speed resulting in valve float (popping, misfireing, or backfireing at high RPM)
Bad, weak or improper ignition components can display the same symptoms.
Talk with the cam manufacturer or your local machine shop as to the correct springs for the application.
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Junior User
Joined: May 2001
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From: Southern California
No Backfire
Thanks for the ideas, I have no backfire associated with this but it sounds like a bunch of 5 lb marbles hitting each other real fast and as soon as I let up on the gas it goes away.
Elder User
Joined: Jan 2004
Posts: 925
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From: northwest,sc
This sounds like spark knock to me now. Valve float will cause a skip while the valves are not closing fast enough.
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From: gravenhurst
i had an old chev 305 that used to do that and it was the cam. It only did that if i juiced it sounds like the fourth of july.ha ha if u checked everybodys replies and nothing. then check the cam. sounds like the cam lobes are wearing out .good luck
