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#1
03-18-2014, 01:54 PM
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Need advice header flange hole & head
Got top end of motor allmost together and exhaust bolted up, i find that the no.2 header tube is
not lining up with holes in my new aluminum heads. I need no more than a 64th probably takin out of the huge 3/8 flange to line up but im afraid of drilling to hit the head. Is that the only way to go??? I tryed a deburr and not doing much good.Was thinking colbalt drill and taking it easy and see what happens. Bolts are 3/8 so a 11/32 drill bit should do it. |
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#2
03-18-2014, 02:02 PM
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Don't do something stupid! Take the header off and elongate the hole.
__________________
Dave "Big Injun" Anderson dave@4mypontiac.com www.4mypontiac.com For GTO Celebration items click the tile coaster. 
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#3
03-18-2014, 02:06 PM
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Ditto!
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#4
03-18-2014, 03:39 PM
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Which hole???
Remove the exhaust pipe first...see if the header will bolt up...then If not, leave exh. pipe off, remove the header bolts one at a time replacing them w/ longer bolts. You might have enough room to use a rat tail file or a dremel tool, so you can stay away from the head...
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#5
03-18-2014, 04:06 PM
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very front on no.2 tube. closest to front of motor. I an get in the hole with a dremel its just 3/8 thick and looking for a easy way out. It took 2 days to put the header on man i don,t fill up to removing it.
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#6
03-18-2014, 05:22 PM
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I will assume all your other header bolts are loose?Is the flange cut between the tubes or still there?
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#7
03-18-2014, 07:55 PM
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straight flange across not separated, no bolts are not loose, everything tight from back to front. just cannot get front bolt in.
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#8
03-18-2014, 08:15 PM
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Loosen all the bolts a couple of turns so you can shift the header around and the last bolt will most probably go in. If it doesn't, take the header off to open up the culprit hole.
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#9
03-18-2014, 09:42 PM
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Quote:
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#10
03-18-2014, 11:50 PM
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that's for sure a scary situation if trying to drill it like that. Especially when bits like to grab and pull themselves through when you get to the end of your hole. If you could at least get the bolts loose again to the point you could slip a piece of steel plate in behind the flange to block the head and give you a little shield to bang up against. But like has already been said you may be able to just get the bolt in if you just loosen the others. Everyone here knows how tough Pontiac headers are and understand not wanting to loosen bolts that no doubt took forever to tighten, but its better to be safe than sorry.
__________________
 1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi. Everything installed, fired up and tuning has begun! |
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