Billet Head Kit / Patriot 9r-850-Boost Catalyst 858 we add heavy-duty valve springs

we add heavy-duty valve springs

We use this and our Superflow 902s dyno center to create a custom program that provides great power

Stock thickness head gasket = 11:1 compression (100 octane needed)

2" internal stinger (low altitude 0-6

If Running (7S Display Quick Select Tunes) on dash do not update your display as you will loose this function

Billet Head Kit / Patriot 9r-850-Boost Catalyst 858 we add heavy-duty valve springsWhen using the Billet head on 850 boost, you must run race gas tunes. You cannot run 91 fuel Billet Head Kit for 2019 & up Patriot 850, 9R, and Patriot Boost Engines Increase cooling capacity for lower running temps which helps maintain peak power Low altitude kits gain 4 5 mid range and peak horsepower High altitude kits gain 8 9 HP in the mid range and 7 8 peak BMP tune is required when running in combination with our pipe We recommend running