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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#19928 08/01/2004 2:03 AM | Joined: Apr 2000 Posts: 499 'Bolter | | 'Bolter Joined: Apr 2000 Posts: 499 | A guy name Twisted6 (Larry) is doing some work on "lump ports" for the 250/292 and is setting up a web page for it. I see that Ken, who is doing a lump port, has found it. Very interesting pictures of cut open heads. Lump Port I'm quessing he plans on selling the lumps at some point. For now he's putting out a lot of info.
'67 GMC 3/4 292 4spd
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#19929 08/01/2004 5:39 PM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | Richard, the lump port conversion is a interesting topic, directing air flow to the valve rather than just hogging open the ports and hoping for the best.The lump increases the distance from the short port corner to the valve,allowing for distance to equalize air flow around the valve which improves port flow in heads having a right angle turn from the port to the valve. | | |
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