RockLakeYachtClub
Newbie
I have the SUM-151124 heads on my '97 Suburban. (Made by Dart.) Installed them the way they came. The Comp 981 springs are listed as having a spring rate of 373. I also installed an LT4 Hotcam at the same time. Never any problem with this combo. (Bought/installed early 2014, 25K miles on them now.)(The Comp beehive 26915s only have a spring rate of 313, which is also supposed to be OK for roller cams with valve lift numbers like you're talking about.) No idea why Summit has that note saying, "Springs are set up to run hydraulic flat tappet cam."I thinking of going with this cam. I called Lunati and they said the comp cams 981-16 springs will work fine with it.
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