.
. . Head
has about .006" crown to take out of top middle. Cutter
should be stopped before it reaches the ends of the head;
so the area under the end towers are only skimmed.
Looks
to be warped .003 on bottom. Average
thickness at front of head is 4.484 (4.479R,
4.488L) Average
thickness at rear of head is 4.491 (4.487R,
4.495L) DATSUN
U20 USED HEADS
Info .
Datsun
SRL311 Cylinder Head from Rallye Enterprises,
Ltd.
Has
3 welds on bottom surface in areas not prone to cracking.
(any cracks in these aluminum heads are rare anyway). I
do not know the reason for the welds; but they would have
to be surfaced down.
For
General Info on U20 Heads click on Rebuilt
Heads
Info.