hey guys,i just did a Compression check on both of my thirdgens

my 85 camaro LB9 with 78k on the clock did the following..

189 #1
190 #2
186 #3
186 #4
184 #5
191 #6
188 #7
185 #8

my 84 T/A l69 showing 71k on the clock did the following.

193 #1
190 #2
185 #3
187 #4
189#5
190 #6
191 #7
184 #8

any ideas on if these figures tally up to about what the factory compression ratios should be? both i beleive are rated 9.5 to 1,both cams are pretty much the same ,duration is,the lift is almost identical on the L69 and the 85 LB9.

any thoughts?

 

They both look OK to me.

You can't determine the CR from a compression test. There are way too many factors that affect the reading. The biggest one is the cam; the less cam you have, the higher the numbers will be. I've seen 8.5:1 motors with 929 cams produce nearly 200 psi for example.

That test is really only good for telling the general engine condition; the absolute value of pressure that you should see with any given motor is something you can only guess at, the important thing is that they all be within a small percentage of each other. Within 5% is ideal. Looks like both of your motors are in good shape, as far as that reading is concerned.