Motorgen - Automotive Events, Meets, Cruises and Forums - View Single Post - Started Porting the Heads on the Chevelle

94cobra69ss396 · 09-14-2009, 11:22 AM

So I finished porting the heads on Saturday. Then on Sunday I cleaned the valves, lapped them and then installed the new valve springs. Here are some pictures of the completed work.

Glenn, I didn't shorten the valve guide because they are not very long and I was worried about how stable the large valve would be with the high spring pressures. I didn't want to compromise the stability of the valve and felt that the little bit of added cfm, if any, was worth the chance of the valve being able to rock in the seat. I'd rather have them last a long time.

Exhaust.

Seat before lapping.

Seat after lapping.

Cleaned valves.

Before lapping.

After lapping.

Intake.

Combustion chamber.

New springs.

During install.

09-14-2009, 11:22 AM	#21
94cobra69ss396 Fast & Filthy Join Date: Jun 2008 Posts: 3,840 Tweet	So I finished porting the heads on Saturday. Then on Sunday I cleaned the valves, lapped them and then installed the new valve springs. Here are some pictures of the completed work. Glenn, I didn't shorten the valve guide because they are not very long and I was worried about how stable the large valve would be with the high spring pressures. I didn't want to compromise the stability of the valve and felt that the little bit of added cfm, if any, was worth the chance of the valve being able to rock in the seat. I'd rather have them last a long time. Exhaust. Seat before lapping. Seat after lapping. Cleaned valves. Before lapping. After lapping. Intake. Combustion chamber. New springs. During install.