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Note: Although this is a new head you should always check for flatness and proper valve recession before installing. Most Cummins head requires resurfacing before install.
Sold as a complete cylinder head with:
For casting numbers #3977225 - #3977221 (may apply to others, call with yours if it differs)
THIS HEAD IS A DIFFERENT CASTING THAN CUMMINS, KEEP THIS IN MIND WHEN MILLING OFF THE AIRBOX FOR RACE APPLICATIONS!
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ProMaxx part number: CHR621N
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