engine backfiring after redoing heads maybe some type of cam timing error

i just redid the heads and when i turn it over it backfires and the accessory water holder backs up out the release tube. what or where do i have the timing off on the cam or in the piston order?

Assuming Mopar gasoline engine of some sort.

If cranking the motor is causing the radiator overflow tank level to change, you have more serious problems than cam timing! From best to worst case:

1. Hopefully you have the wrong head gasket(s).

1. If it is a V engine, possibly the heads are not symmetrical and you have them switched.

2. Worst case is the cam timing was off so badly that a piston came up and wedged against an open valve and cracked the head or cylinder wall.

I think the answer is #3 and you're screwed. Gyz

Assuming Mopar gasoline engine of some sort.

If cranking the motor is causing the radiator overflow tank level to change, you have more serious problems than cam timing! From best to worst case:

1. Hopefully you have the wrong head gasket(s).

1. If it is a V engine, possibly the heads are not symmetrical and you have them switched.

2. Worst case is the cam timing was off so badly that a piston came up and wedged against an open valve and cracked the head or cylinder wall.

I think the answer is #3 and you're screwed. Gyz