I had a vent tube fall out of my Holley 650DP at an autocross. In between runs I started the car and heard a noise while getting ready to get back into line. The vent tube broke into pieces I figure in the first cylinder and bounced parts back into the intake and dinged up 3 other pistons and associated areas of the cylinder head (dual plane shared ports). I removed the pistons and cleaned them up and milled the heads. I checked the other vent tube and it was loose. Made a replacement and epoxied both in. So check them. Still running strong.
331, RPM intake, TW heads, TF STG II cam, 3:55, powerjection III, 3550 trans, NT-03M Enkei 18x8.5 & 9.5, Kumho XS 245-40 \ 275-35, 3-link, Fast Freddies PS, ABS