timing engine -what does it mean when engine is sucking air through exaust ports
 

im rebuilding a 350 and i put the starter on it to turn it over. I put my finger over the #1 spark plug hole but it doesnt push any air out. But it is sucking air through the exaust ports on the head. there are no spark plugs in the engine right now.Does anyone know what the problem is ? i lined up timing marks am i 180 out?
thanks

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

You put the timing gears dot to dot?

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

yes dot to dot

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

You might double check, but I dont think dot to dot is correct on a lot of timing gears. For some reason its striking me as a mistake Ive almost made, and it would make it 180 out.

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

hmm so thats the only thing that would cause it?

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

If your exhaust is sucking in your chain is on wrong. Does the same thing when the wear off and skip a tooth. Pop it off and take a look at it.

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

Dot to Dot is ok. You just need to find TDC and re-install the dizzy to #1.

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

Be safe and degree the cam with the intake centerline method.
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Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

Valves are adjusted incorrectly.

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

Here is a Pic of a Dual Roller setup, but you get the idea.

http://i185.photobucket.com/albums/x...SUWiring-3.jpg

Also recheck the valve adjustment like suggested earlier in this thread, rotate the engine over (by hand) spinning the push-rods with your fingers for intial lash, then due your 1/2 or 3/4 turn preload.

Desert

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

I think you all thinking way too much. Turn the the crank in the proper direction and it should be exhausting through that port:uhmk:

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

Original post said , He put the starter on, I assumed he was using it to crank the engine. He never mentioned cranking it by hand , which is the only way it could be spinning backwards.

Desert

Re: timing engine -what does it mean when engine is sucking air through exaust ports
 

Thats the only way I know an engine will draw in air from the exhaust port. If he's using the starter then he has a boat cam that is designed to be rotating in the oposite direction. I.e. a boat with twin engines.