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parish8 · 09-15-2018, 07:37 PM

I am running the pac 660 springs https://www.texas-speed.com/p-6213-t...retainers.aspx

I cant get it to rev past 6700rpm and it hits what sounds like multiple cylinders missing. that's with the cut outs open. with them closed it has this issue more like 6400rpm. I am not even at peek hp at 6700rpm. I am running about 20psi.

I am 90% sure it is the valve springs. is there a drop in spring that is a little more aggressive and will it work with stock lifters(dod ones swapped out)?

09-15-2018, 07:37 PM	#1
parish8 Drives: 17 SS a8 Join Date: Feb 2010 Location: omaha Posts: 1,678	best valve spring for high boost? I am running the pac 660 springs https://www.texas-speed.com/p-6213-t...retainers.aspx I cant get it to rev past 6700rpm and it hits what sounds like multiple cylinders missing. that's with the cut outs open. with them closed it has this issue more like 6400rpm. I am not even at peek hp at 6700rpm. I am running about 20psi. I am 90% sure it is the valve springs. is there a drop in spring that is a little more aggressive and will it work with stock lifters(dod ones swapped out)? __________________ dropped a valve in the 6.2. now running a drop in rods and piston 5.3 best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472