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#1
01-01-2024, 04:42 PM
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Edelbrock Valvetrain parts??
Anyone know if the Edelbrock valves/parts used in the 72cc d-port are same parts used in the 72cc round port heads? I'm assuming they are but just wanted to double check
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#2
01-01-2024, 05:03 PM
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Edelbrock offers the both the D port head and the RPM head in a standard hydro version and a hydro roller version .
I know both the standard D port and the RPM head springs are rated for the same .575” lift, and if they both use the same spring I can’t say without further investigating the valve lengths used.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
01-01-2024, 05:04 PM
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Pages 115 & 116 list the associated part numbers:
https://edelbrock-files-v1.s3.amazon...ck-Catalog.pdf .
__________________
'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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#4
01-01-2024, 05:21 PM
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Quote:
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#5
01-01-2024, 10:00 PM
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i thought from what i had read, the round ports use a longer valve than the d ports, they use.
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#6
01-01-2024, 10:13 PM
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#7
01-01-2024, 10:15 PM
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https://www.edelbrock.com/intake-val...eads-9751.html
thats the o port valve length. i didnt realise the edelbrock valves were so pricey |
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#8
01-01-2024, 10:35 PM
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I can't speak for their d-port heads but if it helps here are the lengths for early round port version of the Edelbrock RPM heads as delivered by Edelbrock.
87cc version 5.093" intake / 5.110" exhaust 72cc version 5.213" intake / 5.230" exhaust Keep in mind these are the reported lengths of the valves used by Edelbrock themselves in their assembled cylinder heads, in 1999. Some aftermarket valve lengths will vary slightly for the same application. .
__________________
'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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#9
01-02-2024, 12:03 AM
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I just find it really interesting the shorter valves are in the 72cc d-ports. I really expected all 72ccheads had same valves and 86cc was same.
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#10
01-02-2024, 07:07 AM
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What Steve posted in #8 is correct.
In terms of the round port rpm heads that difference of .120" between the two valves is the difference in chamber depth between the 87 CC head and the 72 CC head.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#11
01-02-2024, 12:46 PM
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In terms of the round port rpm heads that difference of .120" between the two valves is the difference in chamber depth between the 87 CC head and the 72 CC head.
Eddy 87 cc chambers were machined deeper from 72 castings so used a shorter valve since they came out. Weren't 71-72 HO heads made with shorter valves than the RAIVs also with their deeper chamber? 6X were even shorter than early D ports with the deeper chamber they have. My guess to keep IH on springs and relation of rocket to valve tip the same to use the same pushrod lengths.
__________________
Skip Fix 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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#12
01-02-2024, 03:51 PM
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To me the 72cc d-port and round port look the same (which makes sense but maybe I'm wrong) so if the chambers are the same then the d-port must have a lower bowl roof to make up for the shorter valve or the spring pocket is cut deeper.
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#13
01-02-2024, 05:26 PM
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RAIV chambers are supper shallow 72cc and a #16/62 etc 72cc are deeper as they are not as large a diameter. Maybe the pocket is a little lower on the D port E head vs the round port ones?
Do they take a shorter head bolt?
__________________
Skip Fix 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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