1978 mercruiser 165h.p 250cid.
1978 mercruiser 165h.p 250cid. block planed and valveports reworked for unleaded gas. replacement manifold. Motor ran good for 20 hours and then blew oil/water out when engine opened up to top speed. compression 120 psi on all cylinders except for #6 which was 95 psi. Is this a blown head gasket?
How do you clean engine?
1978 mercruiser 165h.p 250cid. block planed and valveports reworked for unleaded gas. replacement manifold. Motor ran good for 20 hours and then blew oil/water out when engine opened up to top speed. compression 120 psi on all cylinders except for #6 which was 95 psi. Is this a blown head gasket?
How do you clean engine?