Injector size?

[andyr5fun]

Hi can anyone tell me the size of f4r (172) injectors and for willy f7r injectors please I'm having starting issues after a engine swap

[andyr5fun]

So I'd put me meggy engine back in as I've decided 172 engines are torque less un reliable piles of ball bags, I'd plugged the mega squirt in and swapped maps over, it wouldn't start I tried everything cam timing spark timing injector swap, still nothing, after about 8 hours hard stressing I realise the pressure reg has failed, how can that happen? I've never herd of one failing, so if u have a similar problem apparently they can be a problem,