Inliners International Forums General Discussion Hi Performance How to finish lump port?

I just installed my Ravenswood lump ported head. Am I supposed to fill in the top of the allen head with epoxy now, or leave it?

You can epoxy it if you want to, but it wont stay in, and will come out over time. There are lumps made specifically to conceal the bolt head that dont have to be epoxied.

Okay got it. Could I maybe put in those chrome button things that go inside the allen head, or am I worrying too much about something that isn't going to make a real difference?

Dont forget you have a lot of airspeed going thru the ports, and something like that might not be a good idea. Those chrome things will definately get sucked out and into the engine.

If it cracks, it's going to get caught between the valve and the seat.

For the most part,the allen head in the airstream will not hurt air flow much if any.

Can you post a pic?

MBHD

The brazed lump heads leave the bolt head exposed, but the hole in the lump around the bolt head is radiused 360° around it. [img][IMG=http://img180.imageshack.us/img180/6683/brazedlump003.th.jpg][/IMG][/img]

Mine are twisted 6 bolt-in lumps. I'll take a pic and photobucket it when I get home. I think I'm going to leave it, especially since that takes no effort and everything else does!

Update: Mike from Ravenswood says to leave it be, as it didn't make any difference on the flowbench either way. Here is a pic of the port for interested parties:

Covering the head bolt over Or leaving it uncovered.Made no changes in flow bench test.You can how ever radiused the back edge if you want.But this would have been much easier to do before you did the install.

56er,
What size valves are installed? Is there any port work?

Covering the head bolt will certainly cause less turbulance over the lump caused by the flow of air over the hole.
With the conventional bolt in lump, covering the hole is a hard thing to do. Epoxy will work, but when you want to take the head off later, the epoxy will cause you a big headache.

The Premium HI-FLOW bolt in lumps get rid of the head bolt by conceiling it under the lump.








Tom

Turbulance is a good thing.It keeps the fuel mixed.You can get alot of flow and NO turbulance and It wouldn't even hold a fine peice of string in the Air. But even with the smallest amount of turbulance the string will now float back into the air.A peice of clear plexi glass showed this in bench testing.

Also Like a Old thought that if One left the tail gate down on a truck it would have less drag & less turbulance.Well track test showed it to have more drag and down force on the rear And Once the truck bed was full of air, The air just passed right over.
So even in flow bench test with the Bolt in place Or it cover Or just sitting there it showed No changes in air flow Numbers.

this is no different then making to ports to smooth.If they are then the fuel doesn't stay mixed well.

But anyway This is my2cents and what My tests have showed me and what I have learned from others who have done the same testing and have seen the same thing.

56er which staged head did you get.I know the stage1 has no port work done to it.

I tried the tailgate thing on a 1/2 ton long bed chevy over the coarse of a few years and many different trips. The thing that worked best was to take the tailgate off and lay it in the bed.

There are no modern, performance ports that have large air flow obstructions in them. The only reason the bolt hole is there is out of necessity. My testing did show a slight gain in flow. I also think the real action is in the chamber from the less turbulent flow. Fuel can seperate with turbulance.

Stage 4 econo port. 1.94/1.50 valves. So, bowl work and valve job only, with port match.

I went with Mike and Ravenswood because I had a good feeling after talking with him. He was knowledgeable about my areas of concern and had answers for all my questions, even the retarded ones that didn't pertain to the cylinder head. He uses twisted 6 lumps so that's what I have. I am very happy with my cylinder head.

PS Mythbusters tested the bumper myth with fancy scientific meters and the best mileage is from the truck nets. There you have it, I didn't believe it either.

Just curious Rick, who supplied the core head and who actually does Ravenwoods machine work,would you know?

Woody

He will build a head you give it to him but this is one he just had. I don't know who does their machine work, but if you call them I'm sure he'd tell you. (954)923-9883, http://www.goravenswood.com