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post #1 of 8 Old September 25th, 2007, 02:03 PM Thread Starter
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Valve adjustment

did a compression check could my valves not being adjusted cause a cylinder to go dead? cylinder number 8 on my 93 has no compression wat so ever. i just replaced the cylinder heads and cant figure it out it was running flawless before i Messed with it

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post #2 of 8 Old September 25th, 2007, 02:39 PM
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Head gasket...most likely...

If your valves are set too tight they will not close all the way and you will have no compression. For a hydraulic cam, set the valves 1/4 to 1/2 turn past zero lash (when you can no longer freely spin the pushrods with your fingers). Adjust the intake valve when the exhaust valve is just starting to open. Adjust the exhaust valve when the intake valve is closing. This will assure that you are on the base circle of the cam when you are adjusting.

If you have pedestal mount rockers, you will need to use shims to get them set correctly, same 1/4 to 1/2 turn, but if it is more than that, put a shim under the rocker and try again until you get it right.

88 GT CHI headed 351w 10.8 @ 125 - still figuring it out.
03 Cobra 2.3 whipple 10.7 @ 129 - sold it
04 Mach 1 12.7 @ 109 mostly stock - sold it
89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

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post #3 of 8 Old September 25th, 2007, 03:35 PM Thread Starter
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im still kindof lost how could your valves get out of adjustment>?

93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod
91 5.0 lx hatch-Sold
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post #4 of 8 Old September 25th, 2007, 03:43 PM Thread Starter
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ok! so i adjusted the valves got it back together did another compression check and bam all cylinders are at 125 but cyliner number 7 and 8 7 is at 75 and 8=0 i have no idea wats wrong someone PLEASE HELP!

93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod
91 5.0 lx hatch-Sold
92 5.0 lx hatch-Sold
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post #5 of 8 Old September 25th, 2007, 05:43 PM
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how are you adjusting the valves?

Do you have pedestal mount rockers or stud mount? What kind of heads are on it?

maybe your valves were never correctly adjusted when you put the heads on it. but a compression of 0 points to some major problem...like a seriously blown head gasket, a broken piston, or bent or maladjusted valves.
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post #6 of 8 Old September 26th, 2007, 02:38 AM Thread Starter
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well the car hasnt ran since the head swap. they are edelbrock performer heads. before the swap the car ran fine i actually kept up with 5spd bolt on 5.0's in my stock notchback.is there any way to tell if the valves or bent or maladjusted>? im new to most of this never ran into a problem like this before so i dont know what to do the head gaskets were brand new and i torqued the heads to spec and torque sequence

93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod
91 5.0 lx hatch-Sold
92 5.0 lx hatch-Sold
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post #7 of 8 Old September 26th, 2007, 02:48 PM
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Did you retorque the head gaskets? Did you check the block mating surface for straightness? If the car has never started, it is unlikely that it is the gaskets...but it is still a possibility.

Yeah, most likely you didn't adjust the valve train correctly. 1/4 to 1/2 turn past zero lash when the valves are completely closed. Anymore than that and your valves will hang open. If you aren't sure what you are doing, have someone with experience adjust them. One of my friends destroyed three camshafts because he thought he knew how to adjust the valves...
While you are checking the valves watch for any type of binding in the valve train.

88 GT CHI headed 351w 10.8 @ 125 - still figuring it out.
03 Cobra 2.3 whipple 10.7 @ 129 - sold it
04 Mach 1 12.7 @ 109 mostly stock - sold it
89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

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post #8 of 8 Old September 26th, 2007, 03:00 PM Thread Starter
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its at a shop so they adjusted the valves still cylinder number 8=0 i have no idea man they are ripping it apart i hope its not something expensive

93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod
91 5.0 lx hatch-Sold
92 5.0 lx hatch-Sold
91 5.0 lx hatch is offline  
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