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Good luck with those. I changed from FAST 65lb'ers to Siemens Deka 60lb shortys because of that reason.

However, if you take a stock LS7 42lb'er and then compare it to a Fast 50lb'er, they have...

I'd go back through with the install of the intake. Ensure the vacuum port and brake booster hose on back is plugged or routed correctly as well as the PCV ports on front. Check all the gaskets etc.

Please delete