deep springs pocket?
Old(s) Fart
Joined: Mar 2007
Posts: 50,815
From: Northern VA
G heads should have rotators - and thus deep spring pockets - on the exhaust valves only. If you decide to delete the rotators to reduce mass and improve peak RPM, then you MUST shim the deep spring pockets to achieve the correct spring installed height. This is basic head assembly 101.
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Joined: Nov 2008
Posts: 383
G heads should have rotators - and thus deep spring pockets - on the exhaust valves only. If you decide to delete the rotators to reduce mass and improve peak RPM, then you MUST shim the deep spring pockets to achieve the correct spring installed height. This is basic head assembly 101.
On the same note, you can add installed height to the intake with locks retainers......while taking some away from the exhaust.
Or, you could just machine the shallow spring pockets to the depth of the deep pockets. Although, I get a little leery of that.
I really don't like using shims, especially if you have to use a lot of them. If I am going to stack a bunch, I get a valve spring locator and stack a few shims underneath so the valve spring has better control.
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Joined: May 2017
Posts: 100
]Not necessarily true. Using different locks and retainers can get you around .100" +/-. Plus, being an exhaust valve, it doesn't need as much spring as the intake valve so the installed height can be slightly more than the intake.
On the same note, you can add installed height to the intake with locks retainers......while taking some away from the exhaust.
Or, you could just machine the shallow spring pockets to the depth of the deep pockets. Although, I get a little leery of that.
I really don't like using shims, especially if you have to use a lot of them. If I am going to stack a bunch, I get a valve spring locator and stack a few shims underneath so the valve spring has better control.[/QUOTE ]
can i use a complete kit like this http://www.compperformancegroupstore...Code=K42-228-4
with all types of heads (rotators or not rotators) without machining ?????
On the same note, you can add installed height to the intake with locks retainers......while taking some away from the exhaust.
Or, you could just machine the shallow spring pockets to the depth of the deep pockets. Although, I get a little leery of that.
I really don't like using shims, especially if you have to use a lot of them. If I am going to stack a bunch, I get a valve spring locator and stack a few shims underneath so the valve spring has better control.[/QUOTE ]
can i use a complete kit like this http://www.compperformancegroupstore...Code=K42-228-4
with all types of heads (rotators or not rotators) without machining ?????
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