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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: Nov 2002 Posts: 18 Junior Member | | Junior Member Joined: Nov 2002 Posts: 18 | I just bought a Holly Dominator manifold for my 70 chevy (307). I'm putting a Holly 4160 carb on it. 600 cfm. I cant find out what "NO EGR provision means. It came with the manifold paperwork. Any comments on this set-up are appreciated. | | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | EGR = Exhaust Gas Recirculation, a setup to reduce NOx emissions on some OEM engines - means if yer 307 had an EGR setup, you got the wrong manifold?
Bill | | | | | Joined: Jun 2003 Posts: 9 Member | | Member Joined: Jun 2003 Posts: 9 | It means you can't install an EGR valve because they did not provide a place to bolt one on the new manifold. | | | | | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | The non-egr intakes are illegal in some states to install on an egr equipped car. Also engines with EGR had Exhaust gas recirc passages in the heads to plumb exhaust gas to the EGR intake port on the manifold. Then the EGR valve would allow some of the exhaust gas back into the intake ports to be burned again as a pollution control. Some engine designs (73-79 pontiac for example) will exhibit a terrible exhaust leak at the intake manifold when a non-egr intake is used on EGR heads. The ports between EGR heads and Non-egr intake manifolds don't line up. When that happens, you've got to run an EGR manifold, or swap to non-EGR heads, or fill the EGR passages in the head with high temp epoxy or molten lead.
good luck
chip
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
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