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#1
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Edelbrock round port installed height
I am curious what people typically use for valve lengths and installed height in the older Edelbrock round port heads. I am running a hyd roller with these springs at 1.9 installed height:
https://www.summitracing.com/parts/tfs-16911-16 Just reading the forum, seems like people tend to run shorter valves and springs with closer to 1.8 installed height. I wonder why the original builder set the heads up this way? |
#2
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I will have to check my old Edelbrocks to see how they are setup. Do you have the 72 or 87cc heads? Also what lift are you running?
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#3
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87 cc heads and almost .600 lift (old faithful 1.0 with 1.5 rockers). thanks!
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#4
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Well all that matters is to be in the ball park for the needed spring pressure and then to have push rods that give good geometry..
What the heck is your seat pressure at 1.9? The spec in that listing gives every detail but that!
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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! |
#5
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Quote:
It just seems like most of these are set up the same way but mine were done a little differently so was curious as to whether there was any reason to do so. It seems like there are more spring options if you use a lower installed height. |
#6
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A FWIW, below is what I was told by Edelbrock in 1999 regarding their valve length used at the time on round port heads that they shipped assembled.
Their target installed height was 1.800". I presume the same today. #6057 head (87cc)- 5.093" intake / 5.110" exhaust #6059 head (72cc)- 5.213" intake / 5.230" exhaust I bought the Performer RPM heads with advertised 72cc combustion chambers, semi-machined pair P/N 6050 at the time. Today they are on my current 505 set up for solid roller springs at 1.900"-1.910" installed height. The current intake valves are custom Ferrea Competition Plus hollow stem stainless steel with 2.150" diameter and 5.350" length. .
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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 |
#7
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Theoretically both 72 and 87 have a 1.8 IH. Two of mine had been a hair shorted 1.775
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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 |
#8
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Some sources state a installed height of +/- 0.020 inches is accetable.
.
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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 |
#9
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So does this mean my valves are probably .1 inch longer than the Edelbrock spec?
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#10
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What can come into play in regards to the overall installed height? Obviously the valve length.
Valve spring retainer fit ? Valve spring shims ? Valve stem height ? Out of my league steve25 chime in ! .
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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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