ZB32 anti-drain down valve.

[V500]

Anyone know the diameter of the ball in the anti-drain valve in the timing cover?
Drags has it as either 3/16 or 1/4 depending on the page. I'd say it was 1/4 but confirmation would be nice.
Thanks.

[Derek996]

Sorry, I'd have to take mine to bits to find out but from memory I'm sure it's ¼".

[V500]

Thanks. I'm almost sure the 3/16 would disappear through the hole in the seating.