So, today I decide to run some SeaFoam through my 99 JGC V8 as it has 127,000 miles on it. I read up on it to find out how to go about it the best way.

I started the car and had my brother rev the engine to about 2000 rpm's as I dumped SeaFoam into the master cylinder vacuum line (yes, going towards the engine). I got no smoke out of the tail pipe while pouring it in. After pouring about 1/3 to 1/2 the can in I had my brother turn the motor off.

It definately had something weird in there as when the engine was shutdown in kept going for a good 5 seconds like centrifical force (or something) was keeping it going. Never did that before. I waited for about 15 minutes and started it up. I never got any smoke at anytime during this whole process like I a expecting from everything I read.

Did I accomplish anything doing this or did something not go right?

Well, how does it run? Was the engine nice and warm? A hot catalytic converter contributes to the tail pipe smoke as well as a fully warmed up motor.

Runs just like before... Engine temp guage was just below the 210 mark where it usually sits going down the road.

With no smoke I was just wondering if for some reason it did not reach where it was supposed to go.

Runs just like before... Engine temp guage was just below the 210 mark where it usually sits going down the road.

With no smoke I was just wondering if for some reason it did not reach where it was supposed to go.
No or very little smoke means no or very little carbon build up. That's a good thing.
Pour the rest of it in the gas tank--about one ounce per gallon.

Well, I guess I am doing something right then if there isn't that much carbon build up after 127,000 miles.

I did this because I thought that it might (big might) clean some carbon that was maybe not allowing the valves to seat at shutdown and letting oil drip down into the piston. I got a quote to replace the seals but this was by far a cheaper thing to try first.

Thanks for the replies.