TheĬoil bind number for these springs is 1.140 inches. Height of the spring when it is fully compressed and becomes a solid stack. Lift number that is generally 0.050-inch away from coil bind, which is the The PAC spring’s increased seat load helps minimize valve bounce at higher engine speeds with camshafts intended to spin past 6,000 rpm. To put this in perspective, the stock LS1 valve springs are rated at 76 pounds at this same installed height. When the spring is compressed to this height, it creates a load that PAC specs at 140 pounds. The stock installed height for LS engines is 1.80-inch which is the same spec for these TFS springs. This is the distance from the spring seat on the head to the underside of the valve spring retainer. Valve springs are designed to be used with a given installed height. The lobe separation angle on this cam is 110 degrees so it’s got lots of The specs are 236/246 degrees atĠ.050-inch tappet lift with 0.612-inch lift using the stock LS 1.7:1 rocker Hydraulic roller cam for a Gen III LS engine. These TFS beehive springs are made by PAC Racing so we looked up the specs on the springs and compared them to the numbers on your camshaft. Jeff Smith: The short answer to your question is yes because the difference in lift is very small.
I bought a set of TFS valve springs (PN 16918-16) for my Summit 8702 cam for an LS engine and I realized these springs are only good up to a 0.610-inch lift cam. This 0.009-inch error isn’t a big issue but it is if you are building a race engine where clearances can be very tight. We calibrated our dial caliper and then measured the height of our well-used height mic set at 1.800. If you are looking for maximum accuracy, it’s a good idea to make sure your height mic reads correctly.
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