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#1
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Offenhauser
Need help!! I am putting a Offenhauser duel quad 360 on my 75 455. It is hitting the valley pan. Has anyone ever heard of this and what would be the correct valley pan to use???
Thanks Joe. |
#2
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Yes,some valley pans have a raised part kind of in the middle that can interfere with 2-4s and 3-2s.Tom
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#3
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Thanks Tom, do you know which valley was used? I was thinking an early tri power valley pan? I just did not want to get order it and get stuck with it.
Thanks again, Joe |
#4
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Some designs clear, and others need convincing.
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The Following User Says Thank You to Half-Inch Stud For This Useful Post: | ||
#5
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Some need a lot of convincing.
If the car is not driven in the winter, I would switch to a All Pontiac Aluminum valley pan (Lots of clearance but no PCV system in the aluminum pan) and then use the 74 455 SD PCV system: Fresh air from the air cleaner into one valve cover and a PCV Valve (installed in the other valve cover) with hoses going to the intake manifold or the nipples at the rear of the carbs. 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. |
#6
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I would believe ANY 66 or earlier will clear your Offy.Tom
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The Following User Says Thank You to tom s For This Useful Post: | ||
#7
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You need a Ames performance N178WK valley pan if you can't find a early used one.
__________________
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! |
#8
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If you need a pcv, BOP engineering valley pan has a stand tube for a pcv valve
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Illinois Outlaw Gassers 6.27@107 9.97@131 |
#9
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A aftermarket is not necessary!I have run 2-4s for close to 60 years now and have never used one.Tom
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#10
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Someone needs to ask exactly where this intake is touching.
Around the edges is trim and grind. 75 EGR should be sunk deep in the middle. Clay |
#11
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Tom S. is correct. You need one of the earlier pans which has the down draft tube/pcv port at the rear of the pan on the passenger's side. I'm not sure when they stopped making them that way but '66 as Tom said is about right. Those pans have a wide dip from front to rear and the offy will clear it. The later pans with the pcv port at the front of the pan have a much narrower dip front to rear and the intake will not clear. What is hitting is the heat cross over in the center of the pan under the plenum that runs between the two carb bosses. I have an offy on my test stand engine which has a '61 pan on it and it clears. Then my '65 GTO which has a ?? 72 400 engine in it and the correct pan for that engine will not accept an offy 2x4 intake.
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#12
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You want a ‘65 - ‘67 valley pan. They’re easy to identify with the rear PCV location along with four notches at the sides for each of the four pairs of intake runners.
‘64 and earlier are slightly wider due to the higher intake port location and will interfere unless trimmed on both sides. These ones don’t have the notches to clear the runners on the bottom of intake manifold.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#13
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I think Butler sells new ones.Tom
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