Visit The Dirt Forum for More Information

Author Topic:   exhaust mainfolds
racenmotorsports
Member
posted May 02, 2004 06:42 PM
I got to run manifolds on my engine. I didn't want to notch my crossmember to run my ram horns, so I got some off an old GMC van, I should have know something was up when the passenger one was missing 2 bolts. (I'm getting ready to move to another state and can run headers, so I'm waiting to do that). Anyway, the one on the passenger side back 2 holes (cyl 8) don't line up by about 1/16 inch towards the rear. The bolt holes are 1/2" and there is about .210 on either side of the hole. I think I can go with a 9/16 drill bit and enlarge these 2 holes so they line up. Does anyone see a problem with doing this?

On a side note, I can't believe that GM would have let that go out the line, but it is definately the manifold.

jprads
Member
posted May 02, 2004 06:48 PM
you can buy a tool too stretch the manifold


jprads
Member
posted May 02, 2004 06:54 PM
it is called a manifold spreader
available from any tool supplier


racenmotorsports
Member
posted May 02, 2004 06:56 PM
are y'all serious??? spread the manifold?

OK I looked it up. part is probably cheaper than a drill bit.
Thank
Ray

[This message has been edited by racenmotorsports (edited May 02, 2004).]

BK19
Member
posted May 02, 2004 07:03 PM
yes the heat and the cold make them not fit right so the tool goes and pushes it or spreads it so the bolts will go in


joetaylor
Member
posted May 02, 2004 07:07 PM
yes he is serious I'm a mechanic and the first time that I saw that I was baffled but it was MAC day and he had a set of manifold spreaders worked great

what happens the warp like a banna from the heat but the tool is a nessity in the tool box

------------------
U LIFT U LOOSE


juliaferrell
Member
posted May 02, 2004 09:22 PM
Very common thing. Sometimes you can pry them with a bar over where they belong.


racer17j
Member
posted May 02, 2004 10:01 PM
i ran into that on mine too i was able to get mine without spreading it tho just get all the blots started before you tighten them down we usually just use our port a power to shread ours tho if we need to


way2fast72
Member
posted May 02, 2004 11:13 PM
before I got a spreader,I used to start the center bolts then heat the manifold gently with a torch,right in between the ports,once it started to grow start the bolts.


racenmotorsports
Member
posted May 03, 2004 09:00 PM
Thanks for all the advice. I built my own. Had to go to Lowe's anyway for stuff for the new house. Picked up a 1/2-13 long nut out the speciality boxes , 2 threaded rods and a couple grade 8 bolts. Put it all together and 2 WV fits all opened it right up. Cost about $4.00.


tech355
Member
posted May 04, 2004 04:25 PM
I had the same problem with mine,started with the 2 center bolts and slowly tightened all of them.


Back to the Archives