Im at the shop now with the Zilla. Im pretty sure the cap is good, but there is nowhere close to test it. I started the Z and
**** the bleeder on the head. Some air came out. Took off the cap and blipped the throttle a couple times. Got a desent amount of bubbles. So Ill pull the head and check it. Gotta order a head gasket too. Oh ya, 87 Zilla. Cometic ok for head gasket?