Too much spring pressure?
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Too much spring pressure? Ok, so I recently bought a set of LS1 heads off a buddy of mine SUPER cheap. They are CnCd with 210cc intake and 76cc exhaust. Valves are 2.02/1.575. Dual springs with 375lbs/in and max lift of .680. Closed seat pressure is 135lbs.
Im installing these on a stock bottom end 4.8, and I was gonna buy hardend pushrods along with SLP 1.85 rockers. I dont want to tear into the cam, and since I got the heads cheap, Id rather spend the extra on some push rods and rockers. My question is this too much seat pressure or can I install and not have to worry?
Im installing these on a stock bottom end 4.8, and I was gonna buy hardend pushrods along with SLP 1.85 rockers. I dont want to tear into the cam, and since I got the heads cheap, Id rather spend the extra on some push rods and rockers. My question is this too much seat pressure or can I install and not have to worry?
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Valve springs are fine and I would run them as is. I would investigate 11/32" pushrods, hardened pushrods are not stiffer they are made to run with guide plates. These will help control pushrod flex with the stiffer springs.
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Joined: Feb 2016
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Ok thanks guys, im gonna order the 11/32 dual tappered to 5/16 manta pushrods in 7.400. Hopefully i dont need a different length by changine out just the rockers, but ima get the length tool just in case. Im gonna run how the springs are first, but how will i know if they are too stiff?
Springs are fine. As for the pushrods, Manton uses overall length (OAL) not gauge length. Do if you use an adjustable pushrod to measure you can either directly measure OAL if you have a caliper long enough or add 0.017" to the gauge length measurement from the adjustable pushrod.