Comp Cams 987 Springs and large cam... will they take it?
#4
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Don't even think about it!! Those springs are good to .580 and that's it. I have them and get bad valve float with my YT rockers and 230.8/224.3 .576/.563 110.8LSA
My springs were fine when I had stock rockers on ,but the YT's were just enought ot push em over the edge. 987's are older technology. Do it right and get a set of Comp 921's or Crane dual springs that are good to .650 lift.
My springs were fine when I had stock rockers on ,but the YT's were just enought ot push em over the edge. 987's are older technology. Do it right and get a set of Comp 921's or Crane dual springs that are good to .650 lift.
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#9
Staging Lane
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Any suggestions on other springs? Since my heads have been machined for the 987 springs I can't use the 921s or other "stock" size springs...
so ... any other springs that would be good for big lift that are direct fit replacements for my 987s?
so ... any other springs that would be good for big lift that are direct fit replacements for my 987s?
#12
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Originally Posted by tux2112
Any suggestions on other springs? Since my heads have been machined for the 987 springs I can't use the 921s or other "stock" size springs...
so ... any other springs that would be good for big lift that are direct fit replacements for my 987s?
so ... any other springs that would be good for big lift that are direct fit replacements for my 987s?
Shawn
#13
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I checked w/Speed (they're building the motor) and sounded like you can't use the smaller springs once the heads have been machined for larger... also talked to comp cams and they said the same thing (though the dillweed that answered the phone was an asswipe and not at all helpful....)
are there any other springs on a 1.430 OD that can handle this much lift/duration safely or are 977s the only way to go? (1.460 OD )
are there any other springs on a 1.430 OD that can handle this much lift/duration safely or are 977s the only way to go? (1.460 OD )