The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Attempt at new intake/exhaust for inline 250

**'68OrangeSunshine** · 06-21-2005, 06:24 AM

Shifty, I got around a clutch -push -rod -hitting -the -headers problem ['71 Jimmy K/5] on a 350 w/Heddmans by "joggling" the lower ear on the Z-Bar so the front end of the clutch push rod missed the header tube. You could also shorten the push rod -- just make sure your clutch action is good and you don't need anymore room on it before you do.
The Clifford headers I have on my 292 were fitted on back in '78. I don't recall any major hassles. Just some ball pein dimples to clear the angles of the 4V Offy intake (very similar to stock configuration). Also Clifford sells the same p/n headers for both the 250 and 292. With the 292 heavy duty tall deck (+1.75") the downtubes clear the motor mount and Z-Bar pivots easy. Maybe the geometry is not as good with a 250? Your Pacesetters look a lot like the Cliffords. After a 25-year run on my last 292, I recycled mine by getting the headers hot-tanked and bead blasted, then painted them w/ 1500* VHT Nu-Cast Iron and they're doing great on my fresh 292 build.
Hang in there man, these L6s take time because there are fewer experts still alive who remember the old tricks. Results will be worth it.

06-21-2005, 06:24 AM	#5
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,625	Shifty, I got around a clutch -push -rod -hitting -the -headers problem ['71 Jimmy K/5] on a 350 w/Heddmans by "joggling" the lower ear on the Z-Bar so the front end of the clutch push rod missed the header tube. You could also shorten the push rod -- just make sure your clutch action is good and you don't need anymore room on it before you do. The Clifford headers I have on my 292 were fitted on back in '78. I don't recall any major hassles. Just some ball pein dimples to clear the angles of the 4V Offy intake (very similar to stock configuration). Also Clifford sells the same p/n headers for both the 250 and 292. With the 292 heavy duty tall deck (+1.75") the downtubes clear the motor mount and Z-Bar pivots easy. Maybe the geometry is not as good with a 250? Your Pacesetters look a lot like the Cliffords. After a 25-year run on my last 292, I recycled mine by getting the headers hot-tanked and bead blasted, then painted them w/ 1500* VHT Nu-Cast Iron and they're doing great on my fresh 292 build. Hang in there man, these L6s take time because there are fewer experts still alive who remember the old tricks. Results will be worth it. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 06-21-2005 at 06:27 AM.