Comp cams 978 springs or 987??
08-25-2004, 06:57 PM
#1
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Join Date: Jul 2003
Location: Wyoming, Minnesota
Posts: 212
Comp cams 978 springs or 987 for 383??
Which of these two springs would be better for a 383 with a custom ground cam with specs that will be close to 239/245...577"/.576" , 112LSA. I understand that both springs require the head to be machined to fit and they both require different seats and retainers, i just want to know which one seems to hold up the best. I'm expecting consistent 6500 RPM use, and i want valve float to be the last thing on my mind. Also, what kind of springs do alot of you 383 guys use and what kind of RPM's do you guys typically see. Thanks guys!
trav
trav
Last edited by Quick96Z; 08-25-2004 at 07:27 PM.
08-25-2004, 08:37 PM
#2
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Join Date: Feb 2002
Location: Lousiana
Posts: 1,534
Re: Comp cams 978 springs or 987??
I am running the 987 springs and at my installed hieght (1.800) I am good to .600 on paper or about .580 to be safe. Lift in sig. I only rev to 6200rpm and have never had float with this springs with my set up.
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