Cylinder #5 sucked water due to crap header. What next?
#52
Registered
![](https://www.offshoreonly.com/forums/images/icons/prop.gif)
Join Date: Oct 2011
Location: Philadelphia, Pa
Posts: 89
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
I'd check everything that moves first shortblock , heads , valve job. Not to be sarcastic but pressure test headers. Basically your lucky you didn't shoot a valve across the intake. Bust out another thousand
#54
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
They're pretty inexpensive from Summit. Get the one with the magnets in the base though as that helps a lot.
#55
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
So now that everything dried out a bit I went back and loaded the cylinders with WD40 and cranked it a few times. The surge before was with the comp tester in. Without it it spins quite freely. Redid the whole test with 4 compression strokes each test and here are the results. I did not have an air compressor to blow out #5 so it's still off the charts.
#1 175
#3 180
#5 210
#7 180
#2 185
#4 180
#6 180
#8 180
#1 175
#3 180
#5 210
#7 180
#2 185
#4 180
#6 180
#8 180
#1 215
#3 215
#5 220
#7 215
#2 215
#4 220
#6 215
#8 215
Last edited by Baja Rooster; 04-30-2016 at 09:57 PM.
#56
Registered
![Default](/forums/images/icons/icon1.gif)
What kind of shape were the heads in when they tore into them? Did they do any milling, new seats or anything ?
#57
Registered
![Default](/forums/images/icons/icon1.gif)
What do you have for actual compression and what cam are you running ?
Last edited by SB; 04-30-2016 at 09:59 PM.
#58
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
It is a cheap Kragen guage. The needle doesn't even rest on the pin, but it is the same guage for all of the test. Just looking for consistency. The #2 cylinder was the first one I tested. I retested at the end and it came up to 215. *Edited original post
The heads only had less than 100 hours, new Ferrea valves cut into the existing seats. The original valves/seats had a crazy eclipse to them. The heads surfaces were just minimally cleaned up and It should only be 9.6:1
Edit: GMZZ502 cam. CMI headers and the water dumps at the tips.
The heads only had less than 100 hours, new Ferrea valves cut into the existing seats. The original valves/seats had a crazy eclipse to them. The heads surfaces were just minimally cleaned up and It should only be 9.6:1
Edit: GMZZ502 cam. CMI headers and the water dumps at the tips.
Last edited by Baja Rooster; 04-30-2016 at 10:23 PM.
#59
![Default](/forums/images/icons/icon1.gif)
I don't have the bridge for my dial indicator. I have the magnetic base. When I use mine I mount it to read the center of the piston not the edge. Wouldn't using the edge give you some error due to piston rock?
#60
Registered
![Default](/forums/images/icons/icon1.gif)
with a forged piston yes it will rock in the bore when cold.