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Old 09-30-2024, 11:36 AM
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Default 72 cc E-heads

Does anyone know what the flow numbers are on a round port 72 cc E-head outta the box. Is 87 cc any different.

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Old 09-30-2024, 04:10 PM
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Edelbrock has them on their site. I believe they have the 87c listed as slightly lower due to the deeper chamber and different short turn radius. Not a lot of difference.

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
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Old 09-30-2024, 04:58 PM
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The 72 cc ones I have tested flow 278 to 284 intake cfm @28”.

The 87 cc ones are some 5 to 8 cfm less due to the shrouding of the chamber, this also means that ultimately the 87 cc ones can not match the max ported flow numbers of the 72 cc heads, but you can get darn close if you step up to a 2.19” valve.

And yes you can find the numbers for both on the Edelbrock site.

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Old 09-30-2024, 05:02 PM
Steve C. Steve C. is offline
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Edelbrock flow umbers on page 118

https://edelbrock-files-v1.s3-us-wes...ck-Catalog.pdf

As Skip mentions the difference in flow numbers is due to the chamber depth.


.

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Old 09-30-2024, 05:17 PM
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"Like the original Performer RPM casting with its scalloped chamber, the Performer RPM CNC is available in two volumes: 72 and 87 cc. While the same basic casting is used for both applications, the larger combustion chamber is achieved by machining it some 0.120-inch deeper into the deck surface, and that places the intake and exhaust valve seats higher in relation to the port floor, which subsequently negatively affects airflow by some 10 to 15 cfm each."

Source: https://www.motortrend.com/articles/...ead-edelbrock/


.

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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/

Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
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Old 10-01-2024, 11:57 AM
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Great info. Thanks for doing my homework.
OGR

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Old 10-01-2024, 06:55 PM
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For the increased flow of the 72 Dave Bisshop at SD liked them and a dish to get what CR you need for pump gas.

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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