Oval ports vs. rect ports, which is better ? - Team Camaro Tech
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post #1 of 8 (permalink) Old Mar 31st, 03, 03:24 PM Thread Starter
Join Date: Mar 2003
Location: Philadelphia
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Just curious, in a 454 .60 over with 10.5 to 1 forged pistons, hydraulic roller setup, 4.10 rear, 4 speed, Edelbrock performer RPM, Holley 850.
In the above, what difference would it make using cast iron rectangluar port heads as opposed to oval ports? When should either or the two be used ?
Pros and Cons of each ?
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post #2 of 8 (permalink) Old Mar 31st, 03, 04:58 PM
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Please do a search here and over at Team Chevelle b/c there is more at both places then you probably have time to read!!!

And I have read almost all of the stuff myself... pdq67

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post #3 of 8 (permalink) Old Mar 31st, 03, 05:07 PM
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With a 468 and 4.10s in a Camaro I would use big ports. Just remember a Chevelle is a lot heavier car and can actually use the low speed torque.
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post #4 of 8 (permalink) Old Apr 1st, 03, 04:18 AM
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Oval ports have sharp acceleration and more torque Squares do have a place though....on a Camaro that sprays or has been lighten or turns 6500+ like a 427. Chevelles are heavier but a full dressed Camaro ain't all that far behind to justify the squares over the ovals, especiallay street/strip rides. Ovals have more air speed kinda like a garden hose with your finger on it vs. no finger. They only restict above 6500-6700 unless fully ported!! [img]graemlins/beers.gif[/img]

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post #5 of 8 (permalink) Old Apr 2nd, 03, 04:27 PM
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Question from the Riddler,
If square ports are for motors turning over 6500 rpm why did gm put square ports on their 502's with a redline of 5800 rpm and how do they get 502 hp and 502 tq out of the square ports?


67 Camaro Built with Cubic Money
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post #6 of 8 (permalink) Old Apr 2nd, 03, 06:27 PM
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I will bite, cam!

The cam is set up so that with the combination they are selling makes matching hp and t numbers AND I will say that if you look at max grunt, matching hp and t numbers WILL give it to you!!!!!

Compare area under the curves below 5250 rpm and you will see what I mean against moving hp up the rpm scale with the corresponding drop in low rpm t as both curves shift rpms sideways...

And I will bet a new Vette that GM not for a minute would ever admit to the fact that up to about a 540 engine big ovals do very well in the STREETABLE RPM RANGE!!!!!!

Therefore I say they over intake ported the hi-po BB's b/c it was a Corporate thing!!

Just like Ford did to the first Boss 302 with what 2.23" intakes and then the second year 2.19" intakes and finally everybody runs what 2.07's or some such alot smaller intake valve??? pdq67

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post #7 of 8 (permalink) Old Apr 2nd, 03, 09:51 PM
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Here's a set of Oval ports that fly's:

its a lightweight racecar too.

I have a few other pictures of Fast Oval port cars

Gold 67' Camaro<br />Small Block BSE power in the works.
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post #8 of 8 (permalink) Old Apr 3rd, 03, 03:21 AM
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A 502 has a bigger bore and more stroke to take advantage of the port volume so there for the rpm will be less!!!
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