Originally Posted by gearheadslife
would drilling and tapping the valley wall on the inner cylinder side cause any issues with the engines strenth when drilled into the water jacket area.. say like 1/8"
they would be for a few hangers and a a few limiters..
Got an idea to make life easier for racers..
that do allot of testing.. just never drilled there..
and don't want to cause a place for cracks to start..
it be most American v8's
or would epoxy be a better option over drill and bolts..
making removing the intake for cam changes a thing of the past..
I have an old block that was drilled in the lifter valley. Its got holes front and rear three on each side. No cracks. But yes it will be a place for a crack to start. Hopefully they will only crack if the block was at failure point for some other reason the metal is strong and much better than alum or other cheap metal blocks. At low tq i would say no chance of issues at max tq i am sure you could snap the bolt off with a big breaker bar and not effect the block itself.
What is the purpose of drilling the block like that.
I figured it was for a hilborn setup since this block was in storage since the early 70s and has a set of really well cut X hump heads. But never could figure out what it was for. Blower maybe but im got no clue on that one. I am building a few manifolds and was going to reuse them for one of the designs i am working on. That has valley plate. Maybe this is what they were for a poncho style valley cover.