timing issues?

[nathan 240k]

hi guys ive just rebuilt my l28 and i have put a performance camshaft in it my qestion is how much will this change my timing i cant seem to get it to start and its seem to be a timing issue .all timing gear has been set to factory settings

[Lazeum]

You would need to change timing to get max power out of your new cam but it shouldn't allow you to start the engine.
I would advice to check again.

First, do you have sparks? are you sure gas is going through carbs?
Then, I would check firing order to make sure it is ok, check also dizzy orientation at TDC.
Check timing while cranking also if you can.

[Diseazd]

TDC on the compression stroke....

[madkaw]

You need to give us waaayyy more info then that.
What's it doing?
Spitting?
Hitting but not starting ?
Turn over easy?
Like said above - sure its nothing else?
Verified spark?
Degree the cam?

[Jeff G 78]

Like Steve said, we need way more info. The common mistake is to have the distributor 180° off, but it could be a lot of different things. Have you built a Z motor before> Did you start with a new chain and gears? Give us the build details and we'll help you.

[nathan 240k]

its on tdc its not 180 out ive got spark and fuel all timing gear is new yes ive built l series engine,s in the past but not with a bigger cam.the car was just turning over when it did fire it back fired thou the exhaust and flamage out the carb

[madkaw]

Your going to have to do better with your post. I am struggling to read your run on sentences. I would love to help you, but I need to understand you.
Have you degreed a cam before ?
Did you have the timing cover off when you installed the new cam so you could count the sprocket teeth.