While I'm waiting for a new manifold I performed compression test and the readings are No. 1 cyl. 155, N0.2 170 No. 3 170 No. 4 165 is this acceptable to assume that block has no crack. Actually the main problem is water and oil mix so I removed the cylinder head for presuure test and the result is good. I reintall and test run for 2<br />hours in the lake with a speed of 35 miles. When I<br />got home, check the oil and found out another milky oil so I decided to change the 20-yrs. old manifold. Your suggestion is highly appreciated. Thank you.
