350 Problem

[82chevy350]

My 76 has a 350 that is having some problems. I keep fouling number 8 spark plug it gets oily(wet). I got a set of 305 heads off a buddy that i put on the motor for torque. Anyway the truck smokes like its getting oil in the cylinder all other plugs burn dry light brown colored.I have yet to do a compression test.. I really wish i had the money to build a new motor or find a straight 6. Do you guys think this is from a bad pcv valve or just a worn valve guide?

 

[sean1960]

Worn valve guide.

 

[bucket]

Did the problem exist before the head swap?

 

[Jason92]

I have a 86 silverado and the transmission vacuum line is attached to the intake manifold near the number 8 cylinder. Is yours like that? It could be a ruptered diaphram in the vacuum modulator and getting sucked in the intake and going to the cylinder(transmission fluid).

 

[RetroC10Sport]

I have a 86 silverado and the transmission vacuum line is attached to the intake manifold near the number 8 cylinder. Is yours like that? It could be a ruptered diaphram in the vacuum modulator and getting sucked in the intake and going to the cylinder(transmission fluid).

I am inclined to go with this...I had a 1988 Buick that had a bad vacuum modulator and it would suck trans fluid up through the intake and smoke like a freight train.

 

[82chevy350]

Did the problem exist before the head swap?

Not sure it wasnt just a head swap i got a used shortblock and some 305 heads

 

[82chevy350]

It was the modulator valve thanks guys

 

[RetroC10Sport]

I wuz rite!

 

[bucket]

I wuz rite!

Fuzzy Wuzzy wuz a bear?

 

[HotRodPC]

I have a 86 silverado and the transmission vacuum line is attached to the intake manifold near the number 8 cylinder. Is yours like that? It could be a ruptered diaphram in the vacuum modulator and getting sucked in the intake and going to the cylinder(transmission fluid).

I am inclined to go with this...I had a 1988 Buick that had a bad vacuum modulator and it would suck trans fluid up through the intake and smoke like a freight train.

It was the modulator valve thanks guys

Awesome **** guys. Gotta a 5 post Newbie helping out one of the site veterans !!! That's what makes this place so great. Thanks, and Welcome Aboard GMSB Jason !!!
I woudln't have suggested that. Back in the 70's when 305 came about they had a cooling problem back there on the right bank in the back of the block caused by the head casting. It was only for 2-3 years and the head was correted. I'd say those bad heads have all been recycled by now.