Newly rebuilt 440. Went to start for the first time and it is not building up any compression, is spitting gas through the Eddy carb. It was completely rebuilt all new parts basically to stock. Is this a camshaft issue? THX

Lifter pre load, did you check it?

Sounds like a cam timing issue... valves are stuck open... also check valve lash if you have adjustable rockers (did you say all stock?). check for bent push rods. If the cam is off timing you could bend them.
who built the engine? Did they break it in yet?
Good Luck,

spitting thru the carb may mean the distributor is 180 out. simple fix.

No compression?

Cam timed wrong.

I would regoop the cam. set dampener at 15 BTDC. check the lobes when you regoop to see if you are on #1 or #6 compression & clock the rotor accordingly. turn housing so magnet is dead even with the tooth. make a mark on the dampener 2&7/32" CW from the TDC slit & have your dist man set it to that when it fires (vac adv capped). carb bowls filled. batt charged. fan in front of rad. front end jacked up. thermostat OUT. read "breakin secrets" at www.mototuneusa.com goose the throttle many many times during the 25 minute breakin. during mockup confirm lifters are free to rotate (hughes engines procedure).

You are probably very frustrated but you'll need to give more info if you want any useful help.

Who rebuilt it? If you did the build did you install the cam with the dots on the gears or did you install the cam and and degree it? If with the dots on the gears did you aligned the crank gear dot out under the teeth or the one on the inside above the crankshaft key? If the one above the key you need to use the one on the outer edge of the crank gear. If you didn't do the build call the one who did and tell them to come fix it Let us know what youy find and do, it will help a lot of others on here also

I have some compression maybe 50 lbs not enough for it to run.. I think the engine builder didn't perfectly line up the dots on the cam and crank sprockets when he put the timing chain on.

To make it spit gas up out of the carb while cranking on the starter the valves have to be opened The cam is out of time, have the builder correct it or maybe have someone who knows more than your builder help you reinstall the timing gears and align the dots proeprly I think you should really degree the cam for the best performance also

What Cab said, if it is dot to dot (correct dots that is!) it'd still have good compression even with the dist 180 out. With a multiple keyway gearset its confused some to line up the cam gear wrong. inner marks are for adv/ret/straight up phasing. outer marks (closer to perimeter) are for dot to dot

If the wrong dot was used in 'dot to dot' the cam can be as much as 30 degrees advanced/retarded. Recipie for Pistons to hit valves. DAMHIK.