Max Lift With Stock Heads
#1253524
06/19/12 02:00 AM
06/19/12 02:00 AM
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Joined: Jun 2006
Posts: 5,163
CT
GTX MATT
OP
master
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OP
master
Joined: Jun 2006
Posts: 5,163
CT
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What is the max lift you can run with stock heads without machining the guides? What is the correct procedure for checking this?
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: Max Lift With Stock Heads
[Re: Cab_Burge]
#1253528
06/19/12 04:21 PM
06/19/12 04:21 PM
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Joined: Jun 2006
Posts: 5,163
CT
GTX MATT
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master
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OP
master
Joined: Jun 2006
Posts: 5,163
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They are from a non-HP engine but the springs and retainers will be aftermarket. I'm just worried about clearance between the guide/valve steam seal and the retainer. I'm looking at about .500 lift. I haven't bought a cam yet, I'm trying to figure everything out before I buy one and find out it wont work.
The old DC 509s never causes any issues did they?
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: Max Lift With Stock Heads
[Re: GTX MATT]
#1253529
06/19/12 06:04 PM
06/19/12 06:04 PM
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Joined: Mar 2009
Posts: 1,058
bigfork mn
dragram440
super stock
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super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
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I ran a voodoo cam with .533 lift with stock heads with different springs worked good. I changed to a .550 lift voodoo cam and used the same springs and wouldnt rev over about 5800 so im assuming I had some issues there.
67' charger 499 RB
10.57 at 127
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Re: Max Lift With Stock Heads
[Re: lewtot184]
#1253533
06/19/12 11:38 PM
06/19/12 11:38 PM
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Joined: Jun 2006
Posts: 5,163
CT
GTX MATT
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OP
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I plan to check it, what I'm asking is SHOULD it be safe with something like the 509, just over .500 lift? You know, before I buy the cam, check, find out it wont work, and have to get another cam. 
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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The way I check heads for max lift before machining the valve guides and cutting them for valve seals is to remove the valve spring , reinstall the keeper and retainer with the seals I'm going to run on that motor and measure between the top of the valve seal(with the valve held closed) and the bottom of the retainer. I shoot for .060 to .100 clearances depending on the intended valve spring pressures and RPM 
The magnum valve springs on magnum heads will probally take .550 lift at the retainer safely, but you always wnat to check them to make sure. Safe is having .080 or more clearance from coil bind on the springs and .060 or more between the retainers and guides, or valve seals. If your using parts that have not been ran together before you really want to check these clearances 
