I bought pro street 1955 BelAir with a 427 cu.in. , I was given no info as to the motor on what it has in it. I have no problems with the the car as it runs great . It has a Elderbrock 750 with a Victour Jr intake , turbo 400 and 373 posi. I change the plugs a couple weeks back and they look good, my question is I would like to adjust the valves , it has a hydrulic lifters with a pretty good cam in it but not real radical . It has been some time since I adjusted the valves , so as I remenber you adjust them at top dead center at zero lash then turn a 1/4 turn and lock down the adjustment. What feeler gauge do I use to adjust at zero lash then turn 1/4 turn ?. I adjust them by the fireing order 18436572 , it has been some time since I have done this so any help would be helpful on any tips to do the job right. Do I adj the with no gap with a 0 gauge then turn a 1/4 turn ? I also guess the timming is 15 degrees at 2000 rpm , it has a mechanical advance dist. My best guess is it is a 1969 427 - 425 hp . Any help would be greatfuly helpfull .