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.

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Small Block Chevrolet Intake Performance Charts (23 different models tested)

May 15 2014 at 11:24 AM
Paul  (no login)

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

Here is a GREAT reference piece compliments of CAR CRAFT. This article will help us weed through the marketing pitches and see actual dyno results (AND PRICES TOO !).

It is an in-depth tech review with actual testing of 23 different dual plane intake manifolds of the style we would potentially use on our Chris-Craft boats. Of course for all out racing or offshore high performance use, some would opt for the single plane intakes but those are not considered in this particular test because they are basically for "racing only" and very high horsepower and rpm use.

Here is the good stuff just looking at performance, and I'll tell you now just forget about the one at the top, AFR (Air Flow Research). AFR is always better than anyone else when it comes to air flowing through an intake and a cylinder heat, but they are always far more expensive than anyone else as a result, and this intake is a composite, and OUCH, it is way expensive.

[linked image]

Interesting thing about the chart, when it comes to TORQUE, certain Edelbrocks fare well.
However, the delta between the top performing intake and the worst is 23 footpounds, and that is a unit of measure you would actually be able to feel in the boat (ability to spin a bigger prop, or cruise more comfortably at a given speed, etc.).

Then quite astounding, we see the delta between biggest and lowest horsepower is a whopping 48 horsepower. So guys, don't anyone buy a Professional Products Intake, they're at the bottom of horsepower and torque curves, but most likely they are better than the generic iron production intake we have on the boats.

If you have the clearance in your engine compartment or engine box, a 1" or 2" phenolic 4-hole carb spacer will provide even more torque to any of the intakes noted above. It will also help a bit in keeping the carb from cooking during operation and when the motor is shut down. Don't make the mistake and use an open spacer for your marine appliction, use the 4-hole in the rpm ranges we'll see.

So maybe I'll make a swap here sometime on my 327F, but I will probably grind off the brand identification and paint it to match the rest of the motor happy.gif We'll see.



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