CHRIS CRAFT COMMANDER FORUM ® .......A photo-intensive technical reference file and ongoing newsletter regarding the original fiberglass Chris-Craft Commander series. This is an independent not-for-profit and non-commercial web site, not affiliated with the Chris Craft Commander Club ~~ or ~~ Chris-Craft Corporation. Our mission here is to "have fun and share information" about the Commander series (and those associated fiberglass boats on the Chris-Craft family tree) for your individual personal use, and by doing so help promote the good name of Chris-Craft, and help preserve, restore, and appreciate Chris-Craft boats. The main reference feature is the ever expanding MASTER INDEX File which contains what we believe to be the world's largest collection of documentation photos and technical information on the Chris-Craft Commander line of boats, (like these original brochure scans, featuring the iconic first 38 Commander styled by Fred Hudson, and many of the great Dick Avery renditions that followed) , (a huge collection of Chris-Craft 427 tuning and specification information), and a few words about how to use the forum.

We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common ! Just start by posting a note introducing yourself to the group, that's all it takes here (we don't ask for or retain any personal information here, because our intention is to just "have fun and share information".

This forum is registered as chriscraftcommander.com

   

Oil filler tube on the older SBC motors

May 14 2014 at 5:56 PM
Paul  (no login)


Response to 327F Intake Manifold Documentation ( and aftermarket intake commentary )

Note the tall oil filler tube to the right of the thermostat, it also doubles as a vent to allow make-up air into the sump that is drawn out the other end by the PCV system.
[linked image]

Edelbrock makes three nice aluminum intakes that will fit the small block GM motor and work in our marine context.

1). Performer EPS
2). Performer RPM
3). Performer RPM Air Gap

Items 2 and 3 offer basically the same performance, with the Air Gap being a teeny bit better. Item 1 works better than a stock iron intake but not as well as items 2 and 3, which both offer better higher rpm power and a little bit better rating all up and down the rpm range.

The Performer EPS can be ordered with or without the filler tube, here is the #2703 with filler tube millina and tube ready to insert.
[linked image]

The Edelbrock Performer RPM intake manifold has a flat piece of metal (a boss) dedicated for this, and it is located where it can be drilled out to install the old style oil filler tube. You can either buy a new filler tube to replicate the old system or pull the old one off the iron manifold (like I did with my 17-foot Sportsman) and re-use it on the aluminum intake. The whole idea of the oil filler tube is to retain the old style valve covers that don't have filler caps.
[linked image]

However, the Performer RPM Air Gap intake does not have this boss, and there would be a need to find another way to admit make-up air into the crankcase. Can be done, just a point of information. Personally I like the valve covers without filler caps on these old engines, but a filler cap valve cover would be an easy solution.
[linked image]

Interesting to note the RPM and the RPM Air Gap are using identical internal port dimensions, but the RPM Air Gap has the divider plate cut down and the RPM does not. This is commonly done to enhance higher RPM power performance because it equalizes the flow a bit at higher speeds. Apparently the base RPM did not need that.

Despite what the photos might suggest, all of these aluminum intakes are NON EGR.

regards,

Paul

 
 Respond to this message   

Contact the Chris Craft Commander Forum
chriscraftcommander@hotmail.com

©2005, ©2006, ©2007, ©2008, ©2009, ©2010, ©2010, ©2011, ©2012, ©2013, ©2014, ©2015, ©2016, ©2017, ©2018, Chris-Craft Commander Forum, Inc., ®, also known as ChrisCraftCommander.com. and the Chris Craft Commander Forum, Inc.; Information and intellectual property on this not-for-profit non-commercial site may be copied for individual personal use, but any other reproduction or use requires written approval. Any entity who mines this site for names, material, or their other commercial/financial benefit in any way is subject to copyright and intellectual property law; the integrity of this site will be aggressively protected. The material here is for individual personal use and is not to be otherwise used or reproduced. Chris Craft is a registered trademark of Chris-Craft. Neither Chris-Craft nor any subsidiaries of Chris-Craft shall bear any responsibility for the chriscraftcommander.com content, comments, or advertising. Chris-Craft Commander Forum, Inc., is independent from Chris-Craft Corporation, and not affiliated with the Chris-Craft Commander Club in any way; it is an independent educational-based not-for-profit entity that is intended to share free information and have fun. Copyright/trademark/sales mark infringements are not intended, or implied.