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Originally Posted by 86swb
The Hi-heat silicone sealant can be put around both ends of the headers? Can you get this at Advance? I am sure you use this along with the gaskets.
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The hi-heat is ususally red or orange. OR use the ULTRA COPPER instead of the ULTRA blue- black you normally would. The hi-heat can be bought anywhere that sells parts. A thin smear on both sides of the cheap chrome looking , stock type, manifold gaskets(appx. $5 set!) that Jeremy mentions above. I too am running a small block with cheapo flowtechs currently and no header leaks. I made my own collector gaskets from hi-heat garlock matl. I can get from work and I goop them up with the silicone also.
LET IT SET UP A FEW HOURS BEFORE YOU FIRE IT UP! 
I had a set that were soooo bad once on a small block that I cut the flanges and had to run double thick gaskets on the center ports.
DAVE
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"been there, done that, ruined the T-shirt".
2007 LBZ GMC Sierra, ECSB
2006 LM7 RCSB Silverado
98 Vortec project.
94,3500,6.5L 4L80
81 SWB GMC POS finally gone 
73 Pinto, stock, w/CragarSS's-eww 
84,C10 SWB-Yella,stock
86 K10 SWB-Red, hopped up 305,4/S
LOTS of Cummins trucks.
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