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| | | | Joined: Jul 2009 Posts: 8 New Guy | | New Guy Joined: Jul 2009 Posts: 8 | I am trying to purchase the correct stock intake/exhaust manifold for a replacement 240 cu in engine which will be installed in a 1955 1st series GMC 1/2 ton truck. The replacement engine has a cracked exhaust manifold with a 2 1/2 inch three hole exhaust flange. The intake manifold carburator studs are 3 5/8" center to center this engine came out of a 2 ton GMC. Do I stick with these sizes or go to 2" exhaust and 3" center to center carburator studs? I would like to keep the truck stock, if possible. Any advise would be much appreciated. | | | | | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | The motor should be a 248, not a 240, though I suppose that is a typo. I'm not sure what the correct exhaust manifold would be. Hopefully someone with a parts book will look it up for you.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | | | | Joined: Jul 2009 Posts: 8 New Guy | | New Guy Joined: Jul 2009 Posts: 8 | Yes it was a typo, the engine is a 248 cu. in. GMC, thanks jd | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | That exhaust manifold sounds like it may be off of a 302 or large port 270, do you have the casting numbers of the manifold? You can remove the intake manifold and use the one from your original engine as long as the bolts match up.
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A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Jul 2009 Posts: 8 New Guy | | New Guy Joined: Jul 2009 Posts: 8 | Yes, the casting number on the manifold is 218549IP or 2185491P
jd | | |
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