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| Need Some Advice on Intake Swap https://slantsix.org/forum/viewtopic.php?t=58801 |
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| Author: | nathan.o [ Wed Dec 09, 2015 7:02 am ] |
| Post subject: | Need Some Advice on Intake Swap |
Hello all I have a 81 Dodge truck. It has the original 1bbl aluminum intake which I am going to replace with a 2bbl intake. My question is this, the 2bbl exhaust manifold is very corroded and pitted on the mating surface and Im thinking I will have a hard time getting a seal to the engine. Would I be better off trying to grind the surface smooth or just swap out exhaust manifold (I have another exhaust manifold in decent shape)?? Not sure how much of a pain it is to split manifolds and get everything lined up again. |
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| Author: | RumDungeon [ Wed Dec 09, 2015 7:58 am ] |
| Post subject: | |
I would take the intake/exhaust assembly to a machine shop, and have them true up the manifolds while bolted together. Not too bad to split the manifolds if everything is in good shape, but if its old/rusty you might start breaking bolts. As long as your manifolds aren't warped, they should go back together just fine. Jared |
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| Author: | nathan.o [ Wed Dec 09, 2015 2:34 pm ] |
| Post subject: | |
Bolts would DEFINITELY break if I spit the manifold. They are a ball of rust. Anyone know the size of the 2 long bolts? Then it looks like a stud with a nut on top...is that all I need to remove to split manifolds? |
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| Author: | spacecommander [ Wed Dec 09, 2015 4:09 pm ] |
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Quote: Bolts would DEFINITELY break if I spit the manifold. They are a ball of rust. Anyone know the size of the 2 long bolts?
I don't know the size but yes, there's the 2 outer bolts and either a stud/nut combo or on much earlier ones a third long bolt. I bet you find when you take the 1bbl aluminum manifold off that there are plenty of cracks around the EGR valve. If the aluminum manifold isn't cracked - keep it. Eventually somebody will want to buy it for a restoration - heck - maybe it's worth something on ebay now.
Then it looks like a stud with a nut on top...is that all I need to remove to split manifolds? |
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| Author: | nathan.o [ Thu Dec 10, 2015 2:34 pm ] |
| Post subject: | |
So I started to split manifolds and of course the nuts on the long bolts snapped right off. Is that bolt also threaded into the exh manifold? |
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| Author: | Rick Covalt [ Thu Dec 10, 2015 3:38 pm ] |
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yes |
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| Author: | nathan.o [ Fri Dec 11, 2015 3:09 pm ] |
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So I got the manifolds split. Had to use the red wrench to get the long bolts out. I have 2 more questions... The stud that the exhaust pipe connects to is boogered up. Is that a 7/16 stud? I have been reading back through some old posts and I see a lot about using remflex gaskets for manifold to engine seal. I already have a gasket (victor heinz) Would I be better off getting the remflex or is the VH good enough? |
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| Author: | DadTruck [ Sat Dec 12, 2015 11:04 am ] |
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Quote: gaskets for manifold to engine seal
if the manifold(s) and head faces are clean and square and you properly install the manifolds, stock style gaskets are fineRemflex will add a lot of robustness to seal: pitted, rough, warped surfaces. run a die across the mounting stud threads and wire brush the heck out of all mounting surfaces, check the flatness of the manifold face with a straight edge.. |
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