COMPLETE HEADS for 3.875" & 4.000" & 4.250" BORE ENGINES
These cylinder heads offer builders great value and excellent performance. If you’re trying to improve the performance of an older engine these heads will provide a great place to start.
Our heads feature:
• 30% More fin area for cooler running engines.
• Compression release valves included.
• Intake valve @ 25° angle.
• Exhaust valve @ 28° angle.
• High silicon valve springs with chromoly retainers.
• Manganese bronze guides.
• 14mm spark plug.
• Includes Valves, Springs, Collars,
& Compression Release.

93-900 Complete Head Set 4” Bore Bolt Pattern. Natural Finish.
93-907 Complete Head Set 4” Bore Bolt Pattern. Black Finish.
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For Assembled Cylinder Heads: 4.000" & 4.250" & 4.400"
& Bare Heads w/Guides and Seats:
Download Ultima Cylinder Head PDF

COMPLETE CYLINDER HEADS
1. 91-780 Valve guide Ultima std. int.
91-782 Valve guide Ultima +0.001 int.
91-784 Valve guide Ultima +0.002 int.
91-790 Valve guide Ultima +0.003 int.
91-786 Valve guide Ultima +0.004 int.
91-788 Valve guide Ultima +0.006 int.

2. 91-781 Valve guide Ultima std. ex.
91-783 Valve guide Ultima +0.001 ex.
91-785 Valve guide Ultima +0.002 ex.
91-791 Valve guide Ultima +0.003 ex.
91-787 Valve guide Ultima +0.004 ex.
91-789 Valve guide Ultima +0.006 ex.

3. 91-569A 2.250 x 1.815 Intake valve seat (2.100)
91-570A 2.450 x 2.075 Intake valve seat (2.250 & 2.300)
4. 91-568A 1.880 x 1.495 Exhaust valve seat (1.700)

5. 91-748 Exhaust valve 1.700 x 4.620
91-767 Exhaust valve 1.800 x 4.550

6. 91-747 Intake valve 2.100 x 4.580
91-765 Intake valve 2.250 x 4.600
91-766 Intake valve 2.300 x 4.600

7. 91-770 Seal, valve for V2 BT, XL, & TC-88
8. 91-339 Ultima locks, 7 deg
9. 91-338 Retainer, steel 91-340 Retainer, titanium
10. 91-861 Conical valve spring, standard 91-862 Conical valve spring, high performance
11. 91-337 Spring seat
12. 66-242 Exhaust stud-HD 16715-83
13. 93-772 Compression release, 1-13/16 OAL