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#1
11-11-2020, 09:04 PM
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Edelbrock heads
Is it true that if you enlarge the valves to a 2.19 1.77 on a edelbrock head you need a certain bore size to compensate for the larger vslves
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#2
11-11-2020, 10:03 PM
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I would call David Butler at Butler Performance in Tennessee and see what he recommends the minimum bore size for the 2.19 intake valve to be.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#3
11-11-2020, 11:38 PM
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Butler Performance Edelbrock Round Port/Wide Port CNC machined 72cc 370+CFM cylinder heads use 2.190" intake valves. They suggest a minimum bore diameter of 4.15 inches.
.
__________________
'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
11-12-2020, 07:14 AM
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Unless your looking for more then 340 Intake cfm@28" @ .725" lift then the as shipped 2.11" valve is good.
In a race motor when your scratching for every last hp, be very concerned with the flow numbers @ .200" lift while chasing the high lift numbers!
__________________
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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#5
11-12-2020, 09:41 AM
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Butlers porting on the Edelbrock heads boosts peak flow to 315 to 320 cfm with the standard 2.11-inch intake valve, or 325 to 330 cfm with the optional 2.19-inch unit. This info was from a Rocky Rotella article in 2008. I presume it would apply to the 340 cfm heads as well.
Obvious, other sources may vary in their valve selection. ( And a fwiw, the info I mentioned previously regarding the minimium bore diameter was right off the Butler web site ) .
__________________
'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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#6
11-12-2020, 09:44 AM
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Quote:
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#7
11-12-2020, 09:56 AM
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VALVE / BORE ratio
CA equals the minimum cross sectional area of your intake port. (length times width) This is most times your push rod area, but not always. http://www.wallaceracing.com/head-flow-ratio.php Calculate What Intake valve OD Would Be From RPM and CID. http://www.wallaceracing.com/intake_valve.php .
__________________
'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 Last edited by Steve C.; 11-12-2020 at 10:10 AM. |
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#8
11-12-2020, 10:44 AM
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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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#9
11-12-2020, 10:48 AM
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Quote:
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#10
11-12-2020, 11:19 AM
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Quote:
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#11
11-12-2020, 09:28 PM
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I ran E heads with a 2.19" intake valve with a 4.155" bore and they were fine.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
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#12
11-13-2020, 02:48 AM
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Running High Ports with 2.20 valves and 4.155 bore.
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#13
11-13-2020, 07:05 AM
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Your right that it's no all about air flow, it's about pressure recovery also!
__________________
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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#14
11-13-2020, 09:06 AM
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Just had my EDL RPM Round Ports changed to 2.19 Intake with 4.19 (455 .040+) pistons. Plan to run 10-15lbs boost.
SPEED SAFE, NICK
__________________
"The grass is not greener on the other side, its just fertilized with different $h!t" |
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#15
11-13-2020, 10:49 AM
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Quote:
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#16
11-13-2020, 04:14 PM
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Stepping up from a 2.11 intake to a 2.15 on a 4.185 bore, my heads went from 339CFM@.700 to 342CFM. Changing to a 2.19 on the same head went to 345CFM.
I have run the 2.19 on a 4.155 bore. If the block has chamfers even less a issue.
__________________
66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
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#17
11-13-2020, 06:00 PM
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#18
11-13-2020, 11:31 PM
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It did make more HP with the new valves/cam change, but at more RPM. 446CID, Factory 3.25 main block, Eheads, Original Wenzler and Carter AFB's made 785HP at 7200RPM. Car ran it's quickest et 3 weeks ago 9.79@137 tipping the scales at 3750lbs with full exhaust shifting at 7300RPM. Going out tomorrow to try another set of Holleys VS. the AFB's....
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66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 Last edited by Mike Davis; 11-14-2020 at 12:02 AM. |
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#19
11-15-2020, 07:44 AM
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I recently put 1.77 exhaust valves in a set. Did before and after flow test. Picked up 20 cfm on the exhaust side.
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
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#20
11-15-2020, 11:46 PM
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Mike,
Are you running a 3 inch or 3 1/2 inch exhaust? |
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