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Product details
The JayCee JC-4530-0 is a silver billet velocity stack machined from 6061 aluminum in the USA for EMPI HPMX and Weber IDF carburetors, sold individually. A velocity stack, or air horn, bolts to the top of a carb throat and gives incoming air a smooth entry into the venturi. EMPI notes that stacks also help prevent fuel stand-off above the carb. EMPI lists this stack for Dellorto and EMPI D series carburetors as well, and EMPI's exploded views for the HPMX and D series call out the same stock stack, 43-6050-2.
HPMX carbs leave EMPI with chrome steel stacks, and EMPI's chrome replacements come in pairs in 2-1/4, 4, and 6 inch heights. Because it is sold each, plan on two per two-barrel carb. For screens, JayCee makes JC-4538-0, a 2.75 inch pair sized for its billet HPMX and IDF stacks.
Technical Details
- Manufacturer: JayCee
- Manufacturer part number: JC-4530-0
- Material: 6061 billet aluminum
- Color: silver
- Made in: USA
- Sold as: each
Fitment & Compatibility
EMPI lists the stack for EMPI HPMX and Weber IDF carburetors, plus Dellorto and EMPI D series carbs. Weber IDA and EMPI EPC 48/51 carbs use JayCee's separate IDA stacks. EMPI does not publish a height, so ask us before ordering if air cleaner or deck lid clearance is tight.
Installation & Tuning Notes
Check that the stack seats flat on the carb top and confirm air cleaner and deck lid clearance before final assembly.
Common Questions
Is this sold as a pair?
No, it is sold each. A two-barrel HPMX or IDF needs two.
Can I add screens to these stacks?
Yes. JayCee's JC-4538-0 screens are made for its billet HPMX and IDF stacks and come as a pair.
PMB Performance can help pair stacks with screens and air cleaners.
