So I just picked up an alum head with valves and springs. It is missing the rockers etc. Where can i find out the best of, and what I exactly need for this? i understand jegs and summitt have them, but what size, and combo's work best? Ps. the cam is a f303 ford motorsport.
Just one head?? What are you gonna do for opposite side of engine?? What type rockers does it use, stud or bolt down?? A picture would help..
you'll need to know exactly what the head spec's are(including valve lengths to get pushrod lengths and spring heights correct).. but assuming stock port locations and nothing really racy with high ports and/or offset rocker requirements?.. any old SBF roller rockers will do. As with most anything, the more you spend.. the better(tighter tolerances and lighter weight) you'll get. I would consider running 1.7 ratio rockers rather than the stock 1.6's but valve clearance will need to be confirmed either way you go there to be sure everything works out correctly and the motor lives long. That's not an overly aggressive lobe or lift, so stock roller ratio will be fine but the smart guys always always check clearances rather than doing what "everyone else does and they have no problems with that grind". Your dice to roll.. your cash to lose. As for the cam?.. well, baddad will probably jump in to correct me here once again.. but that is a very old symmetrical ground lobe better suited to EFI stuff than a carbed setup. Unless the heads are top notch castings or have been extensively ported with a killer valvejob?(even then all the baddest builders know a street motor loves tighter LSA due to valve sizing and exhaust port limitations).. SBF's always benefit from tighter LSA's and extra duration on the exhaust side to improve torque across the rev range while allowing peak power to hang on just a bit longer as well. All depends on how picky you are and how much power you care to make for the dollars spent to do it.
