what causes a hard starting situation? i have a 62 impalal w/ 327. i have installed a 600 cfm edelbrock and set the timing to 10 btdc as the manual says. When the car is cold it will fire up quickly but if i stop for gas or run in a store it is very hard to restart. it just cranks over and over. it dosent matter if i give the car gas or not. i dont think it is vapor lock because i am only leaving the car for a min. or two max. and it is not running overly hot. Once it fires it runs great. Any tips? Second question my 53 plymouth will fire within a sec or two of turning the key every time. What causes some cars to crank longer than others?