In a message dated 22/03/2004 10:48:05 AM Pacific Standard Time,
owner-mgs-digest@autox.team.net writes:
I've been reading Peter Burgess' book here and have been thinking about
going for some high ratio rockers for my '70 MGB daily driver. I have a
couple
of questions that maybe some of the people out in list land can help with.
It appears to me that if you go for roller rockers you have to get a whole
knew assembly. If I go for normal rockers just with a higher ratio, do I need
to change the pedistals or shaft or springs?
They change the fulcrum point of the rockers and thus move the shaft centre
over, so yes, you'd need a new assembly, or the rockers wouldn't be pushing on
the valve stem properly any more (just like happens when people carve chunks
off the heads and don't shorten the pushrods). They do supply replacement
rockers that fit the stock pedestals and shaft, but they aren't ideal in terms
of geometry.
Is there a downside to use the high ratio rockers?
Yes - on a street car you will have thrown away a considerable chunk of cash
for no discernable benefit.
Bill
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