Is valve shrouding a concern in a 318 w/ 2.02 & 1.6 valves

Dartboy52 said

I only know what I read in this article. From the article:

"Though the 2.02/1.60 valves clear a 318s bores with ease, we machined out the combustion-chamber walls near the head gasket line adjacent to the valves to minimize shrouding...The idea is to enhance flow..."

Click to expand...

Read the whole thing, if you bored it I wouldn't worry about.

Our plan was to find flow by porting the heads and upping the valve diameter to 2.02/1.60 with a set of Milodon street valves. The valve spacing on all small-block Mopars is the same, so these valves will fit in the 302 castings the same as with any 318/340/360 heads. Valve shrouding isn't any more of an issue than with other small-block Mopar heads, since as part of the valvejob the chambers were cut concentric to the valve out to near the line of a Fel-Pro gasket. This makes the chamber quite a bit wider than the 318's stock 3.91-inch bore in the area adjacent to the valve. To address this, the bores were chamfered (notched) to minimize shrouding by the shelf left where the chamber meets the bore. Contrary to popular misconception, 2.02-inch intake valves fit the 318's bores without a problem; in fact 2.08-inch intake valves won't hit.