Hello.I am new to the membership here.I have a 73 Ventura Custom that is a California car.There is an aluminum {?} tube {3/4 inch}that comes out of both heads in front that have been cut and bent back.It has no smog pump on it now.What are these tubes.Did they have coolant running to them?Are they necessary and how would I plug the front of the heads if I needed to?I will try to post some pics.Thanks,JoeAttachment 3479Attachment 3480Attachment 3481