I have a 1977 Volvo Penta MB2/50S Sail Drive that is getting water into the #1 cylinder. I am hoping it is only the head gasket.

Can someone let me know what the cross part number is for the correct head gasket for this motor?

I have read that this volvo motor is a cross with the 6HP, 9HP and 10HP Honda motors. I've talked to my local Honda dealer and he is unable to find any references to a volvo penta cross.

Thank you in advance for your assistance.