Tri power heat sheild question
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
I'm assuming you mean the small sheetmetal cover that is pinned to the bottom of the intake...
It keeps oil from contacting the crossover passage.... sort of.
Oil still gets on the hot passage and turns into chunks of carbon, even with the shield.
I always remove these before media blasting and then tap the pin/rivet holes for screws & use lock tight on the screws. There is always huge chunks of crud underneath it.
Given the opportunity, the oil turns to carbon deposits and falls down into the pan in large chunks.... and plugs up the oil pump intake screen. So my opinion is that it is pretty important.
Have never seen one sold separately.
It keeps oil from contacting the crossover passage.... sort of.
Oil still gets on the hot passage and turns into chunks of carbon, even with the shield.
I always remove these before media blasting and then tap the pin/rivet holes for screws & use lock tight on the screws. There is always huge chunks of crud underneath it.
Given the opportunity, the oil turns to carbon deposits and falls down into the pan in large chunks.... and plugs up the oil pump intake screen. So my opinion is that it is pretty important.
Have never seen one sold separately.
Team Owner
Joined: Jul 2004
Posts: 40,412
Likes: 792
From: Redondo Beach, California
If you need this little head shield, I'd say just fabricate something equivalent. Once the intake maniford is bolted down, no one will know it's not NOS.
Interesting ..I have a 3X2 intake manifold with the large rectangular ports. I have Keith Black Block/Brodix BBHeads and the block has aluminum cast webbing members that will not allow me to mount the manifold with this steel heat shield. For me to mount my 3X2, if I want to, I have to remove the heat shield. Maybe this is why your's is missing.
Just fabricate an equivalent, or buy a junker 3X2 and remove it's heat shield???!
.......
PS!!!! Forgot the obvious. If you block off your EGR you don't need the heat shield. Buy intake manifold gaskets that have blocked off the EGR passage. If your intake manifold is from a early vintage and didn't have an EGR, well then you don't need the heat shield. The EGR tunnel circulated exhaust gases underneath the carb intake manifold plenum. This made this portion of the intake manifold extremly hot. If engine oil contacted the underneath portion of the intake manifold it would be so hot that the engine oil would coke (carbon deposits). The underneath shield protects engine oil from EGR temperatures.
Interesting ..I have a 3X2 intake manifold with the large rectangular ports. I have Keith Black Block/Brodix BBHeads and the block has aluminum cast webbing members that will not allow me to mount the manifold with this steel heat shield. For me to mount my 3X2, if I want to, I have to remove the heat shield. Maybe this is why your's is missing.
Just fabricate an equivalent, or buy a junker 3X2 and remove it's heat shield???!
.......
PS!!!! Forgot the obvious. If you block off your EGR you don't need the heat shield. Buy intake manifold gaskets that have blocked off the EGR passage. If your intake manifold is from a early vintage and didn't have an EGR, well then you don't need the heat shield. The EGR tunnel circulated exhaust gases underneath the carb intake manifold plenum. This made this portion of the intake manifold extremly hot. If engine oil contacted the underneath portion of the intake manifold it would be so hot that the engine oil would coke (carbon deposits). The underneath shield protects engine oil from EGR temperatures.
Last edited by 68/70Vette; Mar 9, 2005 at 12:29 AM.
