10 psi compression

Sweetmarie66

Member

Dec 29, 2017

67

5

18

Jul 28, 2020

#1

• Jul 28, 2020

• #1

Hey folks! Been awhile since I was here, so the inline 200 in our 66 had a dead cylinder, was really odd, ran great the day before, did a dry and wet compression test here are the numbers in the attached photo with the plugs as well, why the H would it run great the day before then next day it had a dead cylinder, #3 ? Blown head gasket? I'm thinking this is a way bigger problem. rings for sure with numbers like that.

 

rbohm

Founding Member

Apr 12, 2002

6,698

550

204

tucson,az

Jul 29, 2020

#2

• Jul 29, 2020

• #2

there are any number of things;

bad head gasket
stuck open valve

are two such items.

 

Sweetmarie66

Member

Dec 29, 2017

67

5

18

Jul 29, 2020

#3

• Jul 29, 2020

• #3

Thanks man!, ya I'm going to pull it here in the fall, rebuild if necessary, then believe me I'll be picking you brain lol.

 

rbohm

Founding Member

Apr 12, 2002

6,698

550

204

tucson,az

Jul 29, 2020

#4

• Jul 29, 2020

• #4

Sweetmarie66 said:

Thanks man!, ya I'm going to pull it here in the fall, rebuild if necessary, then believe me I'll be picking you brain lol.

Click to expand...

no problem.

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

38

119

Antelope Valley, SoCal

Aug 1, 2020

#5

• Aug 1, 2020

• #5

I once had a 289 stick an exhaust valve open by close to a quarter inch while I was driving. Tore it apart on the roadside and saw one valve lower than the others. With few other options, rapped on it with wood and a hammer until it closed, put the covers back on, and made it home. It's a wonder the pushrod and lifter didn't get spit out.

The heads were redone shortly after...

 

Reactions: Sweetmarie66