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Rich Biebel · 12-22-2009, 08:36 PM

"Part # 10212811
Spring Type: Single spring. Outside diameter: 1.25". Pressure @ installed height: 80# @ 1.70". Solid height: 1.20". Average Rate (lbs@in): 256. Retainer P/N: 10241744. Valve Seal Kit P/N: N/A. CT350/350, 350HO engines"

Not much of a spring for anything more than a street car from the specs shown. A performance type stock spring like the old Z/28 type had about 105lbs on the seat.....80 is very close to stock non performance stuff.

12-22-2009, 08:36 PM	#2
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,315 Likes: 25 Liked 544 Times in 213 Posts	Re: GM valve spring # 10212811 "Part # 10212811 Spring Type: Single spring. Outside diameter: 1.25". Pressure @ installed height: 80# @ 1.70". Solid height: 1.20". Average Rate (lbs@in): 256. Retainer P/N: 10241744. Valve Seal Kit P/N: N/A. CT350/350, 350HO engines" Not much of a spring for anything more than a street car from the specs shown. A performance type stock spring like the old Z/28 type had about 105lbs on the seat.....80 is very close to stock non performance stuff. __________________ Rich Biebel S/C 1479 Stock 147R Last edited by Rich Biebel; 12-22-2009 at 08:45 PM.