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post #1 of 5 (permalink) Old 05-22-2019, 03:49 AM Thread Starter
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Header flange fit issue

Can things never be easy? Don't answer that question; I think I already know.

I mocked up the headers tonight to see about clearances. I have stainless 4 into 4 headers supplied by Gas-N and a Levy 408 with RHS heads. I didn't put the header gaskets in place because I can't seem to find them 🙂 and it was just a quick mock up.

I seem to have a flange fit issue. Bolt and primary spacing is fine, but the mating surface on the head is not as tall as the flange and, and the head jogs out just above the mating surface, creating a gap where the top of the flange hits.



I'm guessing I'll need to clearance the flange at the top, but I don't know that I have enough room while still having a decent mating surface to get a solid seal.

I'm open to thoughts. Is this a common issue?


MKIV Complete Kit(order placed: 4/5/16; order completion: 5/14/16; delivered: 5/24/16): 3-link, PC, cutouts, vintage gauges, glove-box dash, chrome roll bars; 17" wheels, B/T leather seats, wind wings/visors sourced during separate 50/50 sale; side pipes and headers sourced through Gan-n
Drive train: Levy 408w w/carb, TKO600, Moser 8.8 with 3.55s and GT rear brakes
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post #2 of 5 (permalink) Old 05-22-2019, 04:24 AM
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Yes, bevel the top edge.



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post #3 of 5 (permalink) Old 05-22-2019, 12:23 PM
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Had that exact same problem. Solution is exactly as Gordon says. I al;so used the REMFLEX gaskets, a little thicker and more forgiving.

Dan

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post #4 of 5 (permalink) Old 05-22-2019, 03:22 PM
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bbk header issue

Don't know if it's related, but the 347 I bought from Levy had RHS heads also and the port location vertically on these heads wasn't compatible with the BBK headers FFR supplied. I had to slot all the mounting holes almost 1/4" to get the ports to line up with the headers. You might check this also.

Did not have the flange problem at the top of the headers as you show.

If you use Remflex gaskets you must have the Sidepipes supported vertically to the frame, not just in and out like many do. The weight of the entire sidepipes rotating the flange causes these to leak in under 1000 miles. Also unless you have at least 1/4" of the Remflex gasket in compression all the way around the port, they will leak. I know this because even after slotting the header holes, I only had a little over 1/8" compression. Final solution was to use Hi-Temp Orange RTV and no gasket. reliable for over 10,000 miles now.

Be careful if you end up pulling the intake off the RHS heads, the third time the threads starting stripping out. They are not Helicoiled like better quality heads from Edelbrock or AFR. I eventually bit the bullet and helicoiled all the intake mounting threads.

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post #5 of 5 (permalink) Old 05-23-2019, 04:54 AM Thread Starter
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I spent some time on the 2x72 tonight with a new 36 grit belt. I scribed a line to leave at least 1/4" of flange mating surface at the the top of each primary, and then beveled down the top of the flange to the line.





It seemed to do the trick. Much better fit.



And with both temporarily mounted:






MKIV Complete Kit(order placed: 4/5/16; order completion: 5/14/16; delivered: 5/24/16): 3-link, PC, cutouts, vintage gauges, glove-box dash, chrome roll bars; 17" wheels, B/T leather seats, wind wings/visors sourced during separate 50/50 sale; side pipes and headers sourced through Gan-n
Drive train: Levy 408w w/carb, TKO600, Moser 8.8 with 3.55s and GT rear brakes
Paint Plan: Under consideration (probably dark grey/titanium with silver stripes)
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