[JLMounce]

It’s been about 4 years since I did the top end on the car. Lately I’ve been feeling as if the car has been a bit down on power. To an extent this has been backed up by a 1 to 1.5” loss in vacuum.

Decided I better start investigating. Warmed the car up to operating temp, pulled the plugs and ran a compression test.

Water temp was 170. Throttle wide open, fully charged battery.

Lowest cylinder was #1 at 172psi. Highest cylinder was #8 at 183 psi. If you look at my readings you’ll see the rear cylinders on each bank pump higher. This corresponds with a measured .002 tapper front to rear on the block. 1 and 2 are .007 in the hole while 7 and 8 are both .005 in the hole.

The plugs look okay but some of the ground straps are white which I’m not really liking. The #8 plug is too clean and I believe has not been firing.

Replaces the plugs with a hotter NGK br5ey.

Drive it a slight amount and gained almost an inch of vacuum, engine is smoother. Can’t really tell on power because even with possibly running on 7, it was still traction limited.

Thoughts?

[shaker455]

Hit it with a few cans of seafoam

[JLMounce]

Funny you mention that. Lunati recommended that to me with their roller lifters. The car is about a month away from it’s pretty-winter oil change. I’ll probably run some through a bit before I change the oil.