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Tom Meyer · 07-29-2009, 07:01 PM

I use 947 comp springs 1.85 installed ht 400 lbs on the seat will set in about 380 to 360 will last me 2 years or about 300 plus runs on my 283 520 head. I shift at 9000 same in the lights. Camshaft and rockers ratio have a lot to do with it along with harmonics. Tom

07-29-2009, 07:01 PM	#7
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 936 Likes: 78 Liked 354 Times in 120 Posts	Re: Valve spring life I use 947 comp springs 1.85 installed ht 400 lbs on the seat will set in about 380 to 360 will last me 2 years or about 300 plus runs on my 283 520 head. I shift at 9000 same in the lights. Camshaft and rockers ratio have a lot to do with it along with harmonics. Tom __________________ Tom Meyer 5240 SS Stock ???