DART 1.60"+ .100 LONG HIGH TEMP EXHAUST VALVE SET (8) FOR SBC/SBF CHEVY/FORD CYLINDER HEADS.

THESE VALVES HAVE THE BACKCUT STYLE HEAD.

The picture above is a file photo. You will receive the correct part numbers.

This sale is for one set of 8 valves.

The retail cost at most High Performance stores on these valves is $159.00. Our price is much less.

The backcut feature is not be mistaken for an undercut. These valves have both features. Backcutting is an additional radius put on the head of the valve to increase the flow numbers and reduce valve weight. The flow increase is approx. 3-6 points on the flow bench, and possibly more, depending on the initial flow rate of the heads. According to one of our machinists who built Winston cup engines for 15 years, the exhaust valves had an additional radius cut on the outermost edge that allowed a better escape of the exhaust gas. This cut on the exhaust valve is in addition to the backcut feature.

Pictured directly below in the first pic. (grey background) is the Dart Competition valve, and the other pic (black background) is a conventional style valve. It was difficult to show the backcut feature in the picture, but you will for sure notice it very clearly when you receive the valves. Also take notice of the blunt radius on the exhaust valves compared to the intake valve.

The picture above right shows the conventional style valve without the backcut feature.

These valves are swirl finished, backcut plus undercut style, and have a very well designed lock groove. The exhaust valves have an additional feature. They have a blunt face on the outermost edge to assist in the elimination of exhaust gases. As with all of our valve train components, they must meet our specs or we will not sell them.

Product Information