cam lift ?
12-18-2006, 08:45 PM
#11
4th Gear Member
Join Date: Jun 2006
Location: texas
Posts: 1,082
RE: cam lift ?
if ya have a cam other then stock ,change springs...if ya have a good lift came above stock and stock springs chances are ya have screwed ya cam anyway that ya have in and smoothed it over a lil..man dont some of you guys read or ask a pro, instead of just askin freinds..if ya use stock springs on a perf cam,then ya will allmost have coil bind and ya sprins wont give the lift needed to cam and will smooth over cam..thats why ya need a new matchin spring to cam to allow that extra lift on cam..other wise howwill ya stock springs open valves to where the cam wants them to be,if the stock springs wont go that high...
12-18-2006, 09:28 PM
#12
2nd Gear Member
Thread Starter
Join Date: May 2006
Location: Budd Lake NJ
Posts: 474
RE: cam lift ?
ORIGINAL: hellas85stang
if ya have a cam other then stock ,change springs...if ya have a good lift came above stock and stock springs chances are ya have screwed ya cam anyway that ya have in and smoothed it over a lil..man dont some of you guys read or ask a pro, instead of just askin freinds..if ya use stock springs on a perf cam,then ya will allmost have coil bind and ya sprins wont give the lift needed to cam and will smooth over cam..thats why ya need a new matchin spring to cam to allow that extra lift on cam..other wise howwill ya stock springs open valves to where the cam wants them to be,if the stock springs wont go that high...
if ya have a cam other then stock ,change springs...if ya have a good lift came above stock and stock springs chances are ya have screwed ya cam anyway that ya have in and smoothed it over a lil..man dont some of you guys read or ask a pro, instead of just askin freinds..if ya use stock springs on a perf cam,then ya will allmost have coil bind and ya sprins wont give the lift needed to cam and will smooth over cam..thats why ya need a new matchin spring to cam to allow that extra lift on cam..other wise howwill ya stock springs open valves to where the cam wants them to be,if the stock springs wont go that high...
what about GT40 complete heads? Dont they come with some kind of heavy duty spring upgrade?
12-18-2006, 09:56 PM
#13
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
RE: cam lift ?
Just make sure they have the M-6513-A50 springs w/damper & M-6514-A50 retainers......otherwise, they need to be upgraded.
12-19-2006, 02:29 AM
#14
4th Gear Member
Join Date: Jun 2006
Location: texas
Posts: 1,082
RE: cam lift ?
new old dont matter see what spring pressure ya cam needs and make sure ya springs on heads have same pressure///if they have good pressure to match and can handle lift on new cam keep..but if it were me,id do it right,and get new 1s anyway..
12-19-2006, 02:04 PM
#15
5th Gear Member
Join Date: Nov 2004
Location: Texas
Posts: 3,834
RE: cam lift ?
If you don't have any proof that the springs on your GT40's are upgraded, I would do it for peace of mind. Stock springs can float valves ~.500 lift (E cam is .498 int/exh). I went w/ the Crane valve spring kit from Summit. It's good to .550 lift
<--Running E cam and worked over E7's....
<--Running E cam and worked over E7's....
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