thats good info scottly,and it should be remembered,the 500/550 pin hole on the crank end when aligned with the static case index mark is 1/4 tdc,,it pays to check timing marks when ever dissembling unfamiliar engines,,sometimes the world standards(if there is any?)are bent,,like the rear cylinder on old jag inline sixes is number one?a few auto engines have say the cam gear dowell at some odd ball degree to case/block index which can be different between model years as smog laws changed,,so using the wrong cam wheel will retard or advance a cam by what ever degrees,,and no one would ever know,,unless it got measured by a finicky assembler who degreed the engines cam assembly,and after all this a cam lobe is only a bump on a stick?
