Stuck without a service manual and trying to determin if block is servicable or needs to be replaced. valve covers off head gasket needs replaced for sure havent yet begun to remove head I'm unsure what to do about two large allen shaped bolts in center of head. does anyone know if these have to come out to remove head or are they covers of some sort for bolts maybe?? I'm hoping someone knows or can tell me were to find the info online for free. I'm on a very limited income till next month and if these bolts must come out I'll need to make some type of tool to do it. I have come across allen bolts this big before. Just thought I'd ask someone that knew before I go and get ahead of myself. Glad I came across this forum in my searches. :S