intake gasket question

I've been fighting a shitty running 347 stroker project for a while. I've got some blow by on the intake gasket, mainly from the intake bolts being a little loose....

When changing it, would it be okay to put some gasket sealer around the intake runners?

Alum heads and intake.

Thanks guys.

 

A coat of gasket chinch wouldn't hurt . What manufacture of gasket and arterial is it?

 

A little sealer won't hurt. But, define "blow by", oil? water? ???

 

Caterpillar has a glue that's really good- a pain to get off tho

 

Well I'd call it soot.... A black powdery dust straight above the intake runner, where the intake and the heads meet. I already cleaned them up or I'd post a pic. No water at all.

I'm torqued them to specs, however the loosened up. I have about an hour or so on the motor.

I used a Fel Pro gasket kit when building the engine. Shellac would work to coat them?

 

I'm running pretty much the same engine you are, except mine is a 331, with aluminum heads like yours. I used Mr. Gasket intake gaskets with some black rtv around each port, and I tossed out the end seals and used Permatex Right Stuff instead. No leaks in over 3 years of being on there, and my intake is a very old Offy 2 x 4 that has a lot of miles on it.

I have had to retorque my intake bolts a few times over the years, but only as a precautionary measure. When you put an intake on you should first put it on bare, intake to heads with no gaskets, and run a feeler gauge around the perimeter to see if they are mating up perfectly. We have had to have our machinist take a cut off of intakes occasionally to true them up.

Don

 

Yep that works, just trying to figure out what he has leaking. Exhaust > black soot from crossover?

 

Here is a pic I did take..

Ya Don what is weird about this thing is Ive been fighting fouling plugs and am sending the HEI back to the company I bought it from for a replacement. Clearly missing on low rpm's, when taking the car out 40-50 mph it will smoke the tire when I downshift it. it's going to be an animal when I get this thing figured out.

 

Looks like a vacuum leak. Is it carbureted? May explain the fouled plugs. I would certainly use some sealer. Were the heads resurfaced? If so did you cut the intake to match? Usually with a mild resurface you don't need to cut the intake. But probably anything over .025 on the heads can make the intake not seal without sealer.

 

Damn Willy1, I hope like hell that is the problem! Maybe i should wait to return the dizzy? Ive never heard a vacumn leak could cause that, but the fouled plugs were on that side.
Yes its carbed

 

Don has you on the perfect path, remove the intake, clean everything real good, set the intake back on the motor, and check your gaps in each corner, top and bottom and see how far off it is, if your heads were ever milled, or angle milled, they could be what is causing your intake not to clamp down tight on the intake mating surface.

And, 226Flattie has already mentioned my favorite sealer, gaskacinch around the ports, and I use a film of black silicone around the water ports on both sides of the gasket, and of course a 3/8" bead of the same in place of the end seals.

 

Looks like the gasket fit like crap too.

 

Ive run those gaskets without RTV sealer and had problems too. I prefer the Mr Gasket 203's? but the local speed shop doesn't usually have them in stock so I end up with the Fel Pro's. I have a GT350 apart right now and have the Fel Pro's with the cross-over block offs sitting on the bench. I have been using RTV black on all the ports and water jackets and that seems to take care of it. On non original cars I do like Don and use a bead of RTV on the front and rear seals.

 

Got her back together. All appears to be good now. Man this thing runs like a scalded dog!