[Jack21]

351W motor has TFS TW heads, Perf RPM, CompCams retrofit hydraulic roller 224I/224E w/.533 lift. Using CompCams pro magnum steel roller rockers, 7/16" studs, 1.6 ratio. Motor idles rock solid at 850 RPM, and pulls 15" - 16" vacuum at idle.

Initial setup with Holley. Switched to a BG Demon 650 DP. Wow! What a difference. Honestly, if you're using a cam with over 222 deg intake duration, these B.G. Demons are well worth the extra $100 over the cost of a Holley. But also too rich with out-of-the-box jetting.

Switched power valve from 6.5 to 8.5. Jetted 70P/78S down to 67P/75S, and could still go leaner.

I can understand why factory jetting is so rich with some of the cams guys use. Hardly any vacuum. But I wish Holley & BG would advise us about this.