Installing valvesprings with the heads on the block.
07-25-2009, 07:42 PM
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Installing valvesprings with the heads on the block. Im installing my new valvesprings(918's) along with Promag rockers. I dont want to pull the heads off. How is everyone keeping the valves from sliding down when changing springs. I had the idea of filling the cylinder with an air compressor through the spark plug hole. Im open to ideas, what do you guys think?
07-25-2009, 07:53 PM
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Im installing my new valvesprings(918's) along with Promag rockers. I dont want to pull the heads off. How is everyone keeping the valves from sliding down when changing springs. I had the idea of filling the cylinder with an air compressor through the spark plug hole. Im open to ideas, what do you guys think?
http://shbox.com/ci/valve_spring_swap.html
07-25-2009, 08:14 PM
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You can bring the pistons to top dead center which will allow for the valves to stay up. There is a great write up at shbox.com (link below). I just did this method and it worked just fine and I didn't have to worry about pulling all the plugs and compressing with air. Make sure that you get the proper guide plates and hardened pushrods too.
http://shbox.com/ci/valve_spring_swap.html
http://shbox.com/ci/valve_spring_swap.html
07-25-2009, 08:56 PM
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The cups on LS7 lifters are .120 shallower than the stock lifters so you'll want to check your pushrod length using a pushrod checker from comp. I have the LS7 lifters with my CC503 camshaft and my pushrod length ended up being 7.050 which is .150 shorter than the stock 7.200 pushrod. Do a search on how to check pushrod length and you'll get an idea of how to it.