LT1 seafoam

ive heard nothing but good things about seafoam, but im still asking out of paranoia.... will an LT1 react well to seafoam? My caprice NEEDS to pass emissions and i cant really afford to do much else.

Seafoam is made for engines. Your LT1 is an engine. It will react exactly how it is supposed to.

ya what he said^

Funny you say that.
Just last weekend I let my 95 inhale some.
Was tough going thru the booster line as it stalls immediately when not connected
I covered most of it with my thumb and let it vacuum in 1/3 like the bottle said (smoke out the tailpipe).
Waited 5 minutes & fired it up (no real smoke)
Decided to do it again, got a little aggressive once & heard knock (probably high compression from fluid in cylinder?) Pulled right out of it.
Cant say I noticed any real difference.
If I was going to do it again I might pick another vacuum port to distribute it thru the manifold

sdstick wrote:

Funny you say that.
Just last weekend I let my 95 inhale some.
Was tough going thru the booster line as it stalls immediately when not connected
I covered most of it with my thumb and let it vacuum in 1/3 like the bottle said (smoke out the tailpipe).
Waited 5 minutes & fired it up (no real smoke)
Decided to do it again, got a little aggressive once & heard knock (probably high compression from fluid in cylinder?) Pulled right out of it.
Cant say I noticed any real difference.
If I was going to do it again I might pick another vacuum port to distribute it thru the manifold

which vacuum port would you try?

Here's a pretty solid write up.
http://www.lt1engines.com/tech/how-to-seafoam-your-car-clean-carbon-buildup/
This guy used the brake booster hose, but I think the PCV might be the way to go

Like I said, an open brake booster hose will stall out your car.
I covered most with my thumb
The funnel mentioned may work just make sure the neck is SMALL
Like thee article said your allowing a huge vacuum leak.
I didnt do the gas tank, oil or throttle body.
May as well if you have no history with your vehicle.
Call it a clean slate.

You could do a little thru any of the ports
Harness port on pass side rear...or canister purge solenoid connection
EGR port on driver side
PCV will probably give you the same stall result as the brake booster hose.
Never tried it. I may be overthinking this though.
Just seems like the cylinders wouldnt get an equal dose?

You guys are using to big of a port. Disconnect the vacuum line on the passengers side that goes to the HVAC system. It is the one coming out of the wire harness, or the drivers side, pull the opti vent. Just get about 18" of vacuum line, place in full bottle. Start engine, and suck away. Just keep one hand on the throttle to keep enough rpms to keep it running. Use half the bottle, then shut the car down, and let it sit for 15 minutes. Restart and continue sucking from the bottle til empty and no more smoke coming out exhaust.
Pour another bottle in the tank. Works great.

IMPALADAKID wrote:

You guys are using to big of a port. Disconnect the vacuum line on the passengers side that goes to the HVAC system. It is the one coming out of the wire harness, or the drivers side, pull the opti vent. Just get about 18" of vacuum line, place in full bottle. Start engine, and suck away. Just keep one hand on the throttle to keep enough rpms to keep it running. Use half the bottle, then shut the car down, and let it sit for 15 minutes. Restart and continue sucking from the bottle til empty and no more smoke coming out exhaust.
Pour another bottle in the tank. Works great.

Here is one advantage of a carb, just take the air cleaner off. This stuff is the only reason why the caprice could get out of it's own way once I bought it/registered it. That first highway trip was sketchy!

I've been meaning to try it on my truck to see if there's anything built up in the top end. People with the LS motors use the PCV hose I believe.

I used the brake booster on my old TBI truck a few times, it made the idle run high when I disconnected it but it didn't stall out or anything, that's not an LT1 though.

If you're just trying to pass emissions, you could try the old HEET/Drygas trick. I poured a few bottles into my tank when the truck was low on gas. Forget how many. The alcohol leans out the mixture. Then I took it for a rip up the highway and got the converter hot. When I got to the inspection place, I left the truck running the whole time. It passed with flying colors when it wouldn't before. Then right afterward I filled the tank with gas to dilute the alcohol in the tank...

I'd google that just to be sure of the procedure people do, it worked for me though. The year after that my truck became emissions exempt. LOL

I usually run the whole bottle through the intake on my cars. I use the brake booster with my thumb over it (and a few coins stacked between the throttle lever and the stop to keep the engine speed up), let it slowly suck in 2/3 of a can. Then I shove the hose in the can and let it stall out on the rest. After about 15 min I start it up (can be a pain because the plugs are so wet) then drive the hell out of it and enjoy the show