Quote:
This is a different LA head but, with the same lay-out.
Anybody with a fraction of mechanical apptitude can visualize
how putting longer and longer valves will quickly, "Not Work".
Additional machining operations and "band-aid" fixes only add
to the subsiquent cost of a buget head.
Hughes has corrected rocker arm geometry on the OEM LA
heads for years so, they have a clue.
We are all guilty of our occasional, poor choice of words and
my hand is up as I am FREQUENTLY misunderstood.
I hope all involved get this rectified in short order.
-Vic Bloomer
longer valves will work, you just have to shim the rockers up accordingly.....
FWIW my virgin chrysler '671 magnum heads,when I measured IH with the stock retainers, I had ~1.62-1.64". using stock locks and 2.2L retainers (to use 1.4" diameter springs), I had 1.60", and about the same with GM 3100 retainers and magnum locks. when I had the valve job done, I had the seats sunk .030" for a little more installed height.
that still limited my heads to about .520-.530" lift with the hughes 1110 springs I chose, but the cam I chose had .316" lobe lift, so I was fine. you can still make a lot of steam in a SBM with .530" lift...
another option to look at would be something like these crane springs:
http://www.summitracing.com/parts/CRN-99840-16/
shim them up .060" so your looking at 1.565" IH, you're looking at .63" travel before coil bind, so a reasonable lift limit of .570-.58" lift. at that IH you're only looking at 104lbs on the seat, though.....
also, before machining, my heads had about .540" of travel before the valve locks hit the seals. in all instances (stock retainers, 2.2L retainers, GM 3100 retainers), the LOCKS would contact the seals about .005" before the retainers.
Last edited by patrick; 07/20/09 02:37 PM.
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