Difference with ls6 cam, stock heads, 7.4 pr
02-06-2006, 09:20 AM
#1
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Difference with ls6 cam, stock heads, 7.4 pr I know that 7.4 pr is not the correct length with stock ls1 heads, but what is actually happening? Are the valves not opening all the way? Would there be a horsepower gain from going with different pr's?
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02-08-2006, 04:37 PM
#8
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There is enough adjustment in the lifters to cover the the smaller base circle of the ls6 cam, dozens of them on this board with ZO6 cam and stock pushrods, or you can replace with ZO6 valves which are a bit longer.
02-09-2006, 05:54 AM
#12
TECH Senior Member
Originally Posted by Lost
There is enough adjustment in the lifters to cover the the smaller base circle of the ls6 cam, dozens of them on this board with ZO6 cam and stock pushrods, or you can replace with ZO6 valves which are a bit longer.
The diference in base circle is ABSORBED by the lifter, but that results in less preload and can induce valve float at high rpm and a noisier valvetrain.