TJC510

i am putting mark 4 heads on my gen 6 block. i have the felpro 1037 head gaskets. as i set the gaskets on the block, i notice it blocks the front coolant hole on the front side of the block. on the rear of the block it leaves one open. i took a pic of it without the gasket but im having problems getting it off my camera.
this is the front


the rear without gasket


with gasket


should i drill that coolant passage out or should i leave it alone?

BillK

TJ,

Leave it alone, the front holes are supposed to be blocked off. The water flows into the block from the water pump, goes all the way to the back then up into the heads, then it flows forward through the heads to the thermostat housing and back out. There is some circulation through the small holes to avoid hot spots etc.

Hope this helps,

Bill Koustenis
Advanced Automotive Machine
Waldorf Md

TJC510

ok thanks, i figured so much after i found a pic of the stock gen 6 head gasket and it has the same setup. i will get to putting it together. thanks again.

TJ