Rich I worked on a project engine for DCAE... it was
2 teams of engineers that would build a race car/truck
and we ended up drilling coolant holes in the heads..
holes were in the block... we tried a few different
sizes to get the flow and cooling right... that ended
up in the production engine(I believe it was a 3.5L
but I dont recall).. made a big difference on the
dyno when we were buzzing it hard and made more power