1968 Malibu sport coupe, 489 ci. 590 hp 600 tq, RV T-400 Freakshow 3200 stall, 3.73 12 bolt posi
I did try a search but nothing narrowed down IMO, 489 10.77:1 comp., Broke in on dyno and 5-6 pulls to 589.? HP & 600.6 TQ and has about 10 road miles, I put new M&H Race Master DR 275/50r17" so I took it for a short drive to see if it would stay straight, from a 15-20 mph roll I punched it long enough to see if it would stay straight maybe 2-3 sec then let off, went around a couple blocks and back to the garage, well now when I start the car it has a loud pop/bang out the exh. then once it warms up it's not so noticeable but doesn't sound right, cam is a Lunati 231/239 110 lsa .600 lift hyd roller, Howards Max Effort (Gatorman) roller lifters, Brodix RR R port 294 115 cc W/CNC option, AED 1,000 carb, So Where would you guys Start looking???