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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2005 Posts: 1,107 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,107 | since they are work trucks they dont require one. the ashton does'nt have one and every gmc 350 and up ive seen didnt have one. as roy stated not enough vacuum to operate it. since i have a vacuum gauge mounted on the dash for the fire side of the truck. the only time the vacuum is above 15" is when im at idle 20-22" or going down a hill with 25" plus. as for the pcv set up if you have the curved pipe from the valve cover to the intake then its original and works well over the vented system which inturn keeps the top cleaner.
my 6100 235 does have a vacuum advance with a vented valve cover. | | |
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