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 Intake / Carb and Fuel Delivery Tech
 Drilling the base plate of a Holley ultra XP
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Miles
Cochise

Canada
209 Posts

Posted - 04 Feb 2018 :  12:41:38 PM  Show Profile  Reply with Quote
These don't have any vacuum ports for timing or pcv. One could drill and tap the intake or put a spacer in with a vacuum port. The other option is to drill the base plate through the boss furnished by holley for adding a vacuum port.
Any of you done this? Was there adequate thickness in the base plate for a 3/8 port?
Thank you for any info on this.
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