Oval port intakes. - Page 2 - Chevelle Tech
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post #16 of 24 (permalink) Old Oct 4th, 18, 2:24 PM
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Kerry
 
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Re: Oval port intakes.

This Weiand intake has peanut port sized runners.

https://www.holley.com/products/inta.../parts/8122WND
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post #17 of 24 (permalink) Old Oct 4th, 18, 3:17 PM Thread Starter
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Durand
 
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Re: Oval port intakes.

Quote:
Originally Posted by SeventyLS5 View Post
Is there enough material in the peanut intake port to open it up to a regular oval port gasket size?? I would get the grinder out and do it to avoid the step between the intake and the port. I wouldnt go crazy on it because the smaller runner size near the valve would just increase velocity.
The intake is a early iron, large oval high rise manifold, not the common variety low rise these days.
I will be using it with some massaged 236 peanut port heads, for a daily driver 454.

65 Pontiac Lemans 468 BBC, t400, 4.10 12bolt

Best 1/4 mile. 11.43 @ 118 mph
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post #18 of 24 (permalink) Old Oct 4th, 18, 3:29 PM Thread Starter
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Durand
 
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Re: Oval port intakes.

Quote:
Originally Posted by Stokerboats View Post
I have a '66 Q Jet intake which is in fact a "high rise" but a heavy sucker.
That's the one.
Mine though is 68' vintage I believe.


Do you know what is under the big bulb on the underside?
Is it a cast oil splash shield for the exhaust crossover that could be cut off, and a sheet metal one made for weight savings?
Or is it part of the exhaust crossover changing levels internally?

65 Pontiac Lemans 468 BBC, t400, 4.10 12bolt

Best 1/4 mile. 11.43 @ 118 mph
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post #19 of 24 (permalink) Old Oct 4th, 18, 3:40 PM Thread Starter
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Durand
 
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Re: Oval port intakes.

Quote:
Originally Posted by rpol78 View Post
Are you really running "peanut" ports rather than large oval? You can pick up a set of 781 or 049s fairly cheep and they'll flow beyond the 4500 rpm range which is where the "peanuts" will start to fall off in their flow.

Here's an article where Super Chevy tried peanut vs ported oval vs aftermarket

Oval Port Big-Block Chevy Cylinder Heads - The Big O - Super Chevy Magazine
Yes I am.
Done the large oval thing, a few times, and have 3 sets of 781's and 1 set of 049's. (signature 468 is one of them)
Trying out a odd ball, old school daily driver street combo, that's been binging around in my head, and 5000 rpm is all I'm after.

65 Pontiac Lemans 468 BBC, t400, 4.10 12bolt

Best 1/4 mile. 11.43 @ 118 mph
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post #20 of 24 (permalink) Old Oct 4th, 18, 3:48 PM Thread Starter
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Durand
 
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Re: Oval port intakes.

Quote:
Originally Posted by pockets View Post
This Weiand intake has peanut port sized runners.

https://www.holley.com/products/inta.../parts/8122WND
That's basically what I'm trying to make the iron intake into.


If I can make this old iron intake and Q-jet work as good, I'll only have time a carb kit into it, instead of over $800.00 for a new intake and carb.
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65 Pontiac Lemans 468 BBC, t400, 4.10 12bolt

Best 1/4 mile. 11.43 @ 118 mph
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post #21 of 24 (permalink) Old Oct 4th, 18, 7:33 PM
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Re: Oval port intakes.

Quote:
Originally Posted by Stokerboats View Post
I have a '66 Q Jet intake which is in fact a "high rise" but a heavy sucker.
A Great intake a carburated Chevy 454 Dually.
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post #22 of 24 (permalink) Old Oct 4th, 18, 8:47 PM
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Re: Oval port intakes.

It's fairly well known that peanut port heads can be fairly mildly ported to get over 500 hp, with dumbass torque to boot. Also, a well built quadrajet will be nowhere near maxed out at 500 hp. I have a buddy, Bob Hinson, who has a '67 Pontiac Tempest that he's had since the early 70's. It has run a best of 11-teens, with a quadrajet, no nitrous, with full interior, functional air conditioning, power steering, power brakes, and the weight of a cage added. This with a pontiac 455. The car was featured in Car Craft in 1995. So yes, properly built, your quadrajet ought to haul the mail. I wouldn't be surprised if it would outrun the 800 dp in your case with the small primaries and all. Ought to REALLY be torquey on the street.
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post #23 of 24 (permalink) Old Oct 5th, 18, 2:32 AM
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Dan
 
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Re: Oval port intakes.

Quote:
Originally Posted by LaVelle View Post
That's the one.
Mine though is 68' vintage I believe.


Do you know what is under the big bulb on the underside?
Is it a cast oil splash shield for the exhaust crossover that could be cut off, and a sheet metal one made for weight savings?
Or is it part of the exhaust crossover changing levels internally?
Base gasket on that old intake has a metal gasket as well as the regular gasket as the heat crossover gets extremely hot there. I'd have to dig the intake out from under a bunch of stuff which isn't easily accessible at this time. Hopefully someone has one they can easily look at to answer your question.

'66 SS Chevelle
565 BBC Mamofied 300cc Ovals
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post #24 of 24 (permalink) Old Oct 8th, 18, 11:19 AM Thread Starter
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Durand
 
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Re: Oval port intakes. ( pictures )

Here is a side by side comparison of the two intakes.

Heights front and rear are: Eddy 4-5/16" front 5-5/16" rear.
Iron 4" front 5-9/16" rear.

Untouched intake port exit dimensions are: Eddy 1-3/4" wide 1-5/8" tall.
Iron 1-5/8" wide 1-13/16" tall.

With the carb adapter I converted to a open spread bore spacer the height is at 4-3/4" front and 6-3/8' rear.

The 236 peanut casting intake ports are 1-5/8" wide and 1-5/8" tall untouched.

By runner size and shape the iron is superior in my opinion (other than weight) and will blend together nicely when ported to match with the 236's final runner size after porting.
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65 Pontiac Lemans 468 BBC, t400, 4.10 12bolt

Best 1/4 mile. 11.43 @ 118 mph
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