There are two different 4 cyl. cams. The difference in the two is in the direction of the gear teeth on the rear of the cam.· There are also two different 6 cyl. cams. The older style with 4 bearings and a large nut for the timing gear, and the newer ETA cams with either 4 or 7 bearings and a bolt & dowel pin for the timing gear. The 278-310 degree grinds require heavy duty springs, either lash caps, larger eccentrics, or longer valve stems.
ROCKER RATIO 1.25:1 NEW STYLE ETA 1.55:1

NEW BILLETS ARE AVAILABLE FOR BOTH 4 AND 6 CYLINDER CAMS. 6 CYL CAMS ARE AVAI BLE WITH BOTH 4 AND 7 BEARING JOURNALS. LIMITED AVAILABILITY ON SOME MODELS. CALL FOR SPECIFICS.
NOCO Boost X GBX45: 1250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables - for 6.5L Gas and 4.0L Diesel Engines
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Camco EVOFlex 25-Ft RV Drinking Water Hose - Features Extra Flexible Design w/Stainless Steel Strain Relief Ends - Lead-Free, BPA-Free and Phthalate-Free - 5/8” Inside Diameter (22591)
$35.99 (as of August 28, 2025 04:00 GMT -07:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Professional Plus Drinking Water Hose: Camco's EvoFlex Professional Plus RV fresh water hose is lead, BPA, & phthalate-free. This quality PVC hose prioritizes your health with every use. Certified Lea... read more