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Mystery intake manifold

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joebobb
New member
Username: joebobb

Post Number: 1
Registered: 12-2005
Posted on Monday, December 05, 2005 - 10:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I am in dire need of some assistance. I have a 1967, 25' Pacemaker. The original engine was a 250HP Pacer (327 cid Chevy). Currently, it is powered by a 260HP, 350 Chevy, that uses most of the ancillary components from the original engine. My intake manifold and lower thermostat housing are both rotted through with corrosion and need to be replaced. The problem is that these are not standard components. The intake manifold is aluminum (with brass inserts at the water passages) and designed for the Rochester Quadrajet. It is certainly not the original manifold (which was almost certainly cast iron and designed for the old Rochester 4GC). What makes the manifold special is that it is a very low-rise unit, and that the carburetor is actually mounted backwards. It looks very similar to the Chris Craft "flywheel forward" manifold; however, the angle of the carburetor mounting flange is in the opposite orientation (as the engine is not flywheel forward). In addition, the manifold used a lower thermostat housing that looks at first glance very much like the equivalent Crusader part. However, it is not the same, as it includes the water passages that are normally part of the intake manifold, and it bolts to the manifold using the manifold-to-head bolts, rather than the water neck flange. The engine does use the normal, Crusader upper thermostat housing. I am sure that the lower and upper thermostat housings are older than the manifold, and are probably from the original, Pacer engine. The aluminum manifold itself is probably quite new. It has the letters "CMC" cast into it.

Can anyone offer me some idea as to where I should look for replacement parts for this? I would be just as happy with the carburetor facing the other direction. The big problem is the height...I really need this, super-low-rise manifold style to clear the engine cover.

Regards,

JoeBobb
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andrew
Moderator
Username: andrew

Post Number: 1284
Registered: 11-2001


Posted on Tuesday, December 06, 2005 - 02:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

JoeBobb,

You could also try posting this question on the discussion board at MarineEngine.com , your engine is newer than most that are discussed here... but someone here may still be able to help.

You might want to post a picture of the manifold(s) here and/or there.

There is a company in Long Island NY that makes custom manifolds using the old manifold as a pattern and sometimes from dimensions that they have on hand. There name is Marine Manifold Corp, 631-694-0714 phone. I have an email of marinemanifold@hotmail.com but that might be an old email address.
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joebobb
New member
Username: joebobb

Post Number: 2
Registered: 12-2005
Posted on Wednesday, September 17, 2008 - 02:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have to say I was really surprised to receive a reply to this, original post almost three years later! I was notified via e-mail an alert. Since some folks were kind enough to provide replies, I figure I'll provide an update/closure to the original topic:

The manifold was the Crusader "low-rise" manifold. It was apparently not an uncommon design - as I have seen a number of engines listed on eBay and elsewhere that appear to have this manifold. It was also (as I originally alluded to) available in an older, cast-iron version for the square-flange 4GC carburetor (I saw an example in an old boat scrap-yard). This item is NLA from Crusader, so if anyone needs one, you will have to find it used. However, at last check the gaskets and thermostat housing parts were still available new.

Last time I checked, www.marinepartssource.com had all of the Crusader engine schematics on-line. This manifold can be seen in the engines from the 1970s-1980s...the 270HP 350cid engine, for example.

Kind regards,

JoeBobb

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