I Need Help With My Chevy 327, broken piston
 

Hello to all ,
I have a 1967 IMpala and i just rebuilt my 327 engine. It ran fine but i tore it apart again and put a cam in it with new timing gear and chain and valve springs. Now when i try to crank it , its very slow like its dragging. But when i pulled the spark plugs out it cranks fine. i Loosened all the valves just to make sure they were tight but still the same barely cranks. ANY HELP ANYONE!!!!!!!

do a compression test to check cylinder pressure. pull all plugs and test one cylinder at a time.

what cr?
what cam?

got a good heavy ground wire on the engine?

recheck your timing

Hi,
Sounds as if the valves were not adjusted correctly,
or the timing is off.
Rich

This is my first engine being rebuilt what do you mean check the ground???? I have the engine on a engine stand. When i pulled the spark plugs out air comes out from each hole. How will i know if the distributer is off?

I loosened them up so there is no tension on them

if you loosen them they won't open & let the pressure off,
thus slow cranking.

http://www.classiccarauto.com/impala...t_valves.shtml

You'll find lots of links here for finding TDC. Then, set your distributor so that the rotor is pointing toward the number one wire within the cap.

A good trick, if you are still using points, is to set the enigne at the static timing value (say, 8* BTDC) then rotate the distributor by hand, with the ignition on, C'CW until the #1 plug fires (keep the plugs out of course). That should be where you want it timed.

Pat

when we partially tightend the valves it was still doing the same thing. Is there anything else it can be. First time builder so any help will work :welcome:

In my opinion you need to check the link & adjust the valves
as per instructions, to just tighten them down isn't gonna get it.

http://www.classiccarauto.com/impala...t_valves.shtml

Ill try that would the ground make a difference i have engine on a stand and i have a wire to the battery and one to the stand

move the ground to the engine, make sure the connection is clean & tight.

I have a wire to the battery and one to the starter. An then i have another one to the ground to the stand and the othere side to the battery. Thats fine right

Are you trying to start this engine or are you just using the starter to turn it over?

Start the motor