valve caps for more lift

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valve caps for more lift

Post  dcbigblock67 on May 20th 2015, 6:09 pm

Just want to play around to see if the 460 engine would like more cam' would putting on the caps give more lift? Cam is a .563-583 crane cam ...seems like the car runs out of breath on the big end.seems lines cheap experiment..

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Re: valve caps for more lift

Post  460pulling on May 20th 2015, 6:25 pm

The only way that i know of to get more lift would be to change the rockers from 1.73 to 1.8 or get a new camshaft. Adding height to the valve tip will only make your adjustment higher and most likely require longer pushrods for the correct geometry. If you added the Lash cap and kept the same rocker placement the valve would never close all the way. I am not and expert but I'm sure if I am wrong someone will correct me.

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Re: valve caps for more lift

Post  dcbigblock67 on May 20th 2015, 6:38 pm

Thank you

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Re: valve caps for more lift

Post  Frank Merkl on May 20th 2015, 11:28 pm

tight the lash up ,close it down to .012" and make a pass . you'll be using some of the clearancing ramp on the cam for more lift . it with also give you more duration
Frank
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Re: valve caps for more lift

Post  dcbigblock67 on May 21st 2015, 3:26 pm

So instead of .026 hot try.012 hot lash?

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Re: valve caps for more lift

Post  kjett on May 21st 2015, 3:32 pm

simple answer, yep
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Re: valve caps for more lift

Post  gt350hr on May 22nd 2015, 12:48 pm

Frank Merkl wrote:tight the lash up ,close it down to .012" and make a pass . you'll be using some of the clearancing ramp on the cam for more lift . it with also give you more duration
Frank

+1 If changing the lash makes a noticable difference ( positive or negative) it will let you know if it's the right direction or not. My guess is it will be positive

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Re: valve caps for more lift

Post  DanH on May 23rd 2015, 3:03 am

lash cap/valve cap will not on its own give more lift. (own its own) depends on rocker geomtry, be the same as changing push rod length.

a lash change of several thousands would have little effect but can make a good different in power.

I'd try one valve at a time, exh. first,, then int. w/ex back to std.  the both.

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