Fast ETs Using a Dual plane ( BB & SB )

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413 said:
All SB mopar edelbrock intakes were Banned by NHRA in December 2019.

Prior to that For stock eliminator the 1965 273 for many years could use the edelbrock with the part number on it. There was minimal grumbling from the Chevy crowd. Then the LD340 was approved and there was more grumbling from the Chevy crowd. Because those 340 dusters are in the classes with all the small block 67-70 Camaro’s. Lots and lots of them camaros racing and they always cry like 2 year olds about the 340 mopars needing to add weight.

The BB edelbrock with factory part number CH4B and DP4B were never approved by NHRA in modern times.

Now the reason they were made with part numbers Is so they could be used for this when they came out, Like early 70’s, but I don’t know specific details on that.
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So they should be approved, but they're. Typical Chevy grandstanding.
 
The ld340 was a dealer option to be installed
Did not come from production line as why they were banned.
 
I ran an Air-gap that I ported at home on my old 410 stroker for a while....best was 10.89. This combo had a relatively small street roller (248/254 @ 0.05 w/ 0.576 lift).
 
rumblefish360 said:
Has anyone used an oil shield under the intake before?
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I made this phenolic plate. It rests on the end china walls. Takes the place of the cork gaskets. My cross over has been milled off.

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Not sure, had changed heads/intake at the same time. It stops any leaks at the china wall area because it gets glued in place with rtv. Worth it for that alone.
 
I went from an old Edelbrock Torquer running 6.36 on the eigth, to a duel plane Edelbrock air gap and ran 7.4 with no tuning. Took it off and fitted a Mopar M1 with no tuning and straight to 6.41. After all the good words about the air gap I can't say how disappointed I was.
 
Dual plane has its limitations just like a single 4 up against a tunnel ram - believe me Im not utilizing a DP because I want to , but was just curious what some of the cars with a DP were running
 
It’s all about a balanced combo. Or just forgetting about the one item that is a limitation and pump the crap-snot out of everything else.
 
Retroboy said:
I went from an old Edelbrock Torquer running 6.36 on the eigth, to a duel plane Edelbrock air gap and ran 7.4 with no tuning. Took it off and fitted a Mopar M1 with no tuning and straight to 6.41. After all the good words about the air gap I can't say how disappointed I was.
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if you lost a second in the 1/8, you have way more going on that just a manifold swap. No way its a second difference.
Thats too funny
 
Is it worth cutting out the divider on an aftermarket dual plane? With my stock 68-69 340 intake, absolutely. But a well scienced out aftermarket one? I know that a stock 340 intake with the divider cut down and massaged as much as possible got this car to mid 10’s. I just don’t think the intakes are the bottleneck in a small block. Cylinder head flow is, at least until you are out of production castings.

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furrystump said:
Is it worth cutting out the divider on an aftermarket dual plane? With my stock 68-69 340 intake, absolutely. But a well scienced out aftermarket one? I know that a stock 340 intake with the divider cut down and massaged as much as possible got this car to mid 10’s. I just don’t think the intakes are the bottleneck in a small block. Cylinder head flow is, at least until you are out of production castings.

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That answered my question 100 % & thank u !!
If a stock iron oem intake can perform that well
With slight modifications says it all.
 
I made a 1/4” carb spacer with a sheet metal divider hanging down from it. To recreate a dual plane. Car slowed down. Just the barest hint of more pull in the 60’ but hurt it all the way through.
 
furrystump said:
Is it worth cutting out the divider on an aftermarket dual plane?
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IDK for sure but a spacer seems to normally do well.

With my stock 68-69 340 intake, absolutely. But a well scienced out aftermarket one? I know that a stock 340 intake with the divider cut down and massaged as much as possible got this car to mid 10’s. I just don’t think the intakes are the bottleneck in a small block. Cylinder head flow is, at least until you are out of production castings.
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I’ve been saying this for years only to have much of the forum throw it back at me as wrong or only for mild mild cams. I won’t argue that an aftermarket intake will be better but I will still state “For on the cheap a factory intake can’t be beat.” Then when you start massaging them… Ha ha ha ha ha ….

I love the stock intake and TQ…. Yea… unable to perform… riiiiight….
 
B3422w5 said:
if you lost a second in the 1/8, you have way more going on that just a manifold swap. No way its a second difference.
Thats too funny
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I just re checked and I went to 6.40 with the M1. There's even more to the story if you're interested. The 6.31 was with a Torquer and a 750 alcohol DP. The air gap also had the same DP carb with no changes. The M1 that picked up massively over the air gap was with 98 octane pump gas through a Holley 870 Vac Secondary running fat as. The change from Methanol to Pump gas has killed my MPH from a previous best of 113 to 108 MPH over the 1/8th.
 
rumblefish360 said:
IDK for sure but a spacer seems to normally do well.


I’ve been saying this for years only to have much of the forum throw it back at me as wrong or only for mild mild cams. I won’t argue that an aftermarket intake will be better but I will still state “For on the cheap a factory intake can’t be beat.” Then when you start massaging them… Ha ha ha ha ha ….

I love the stock intake and TQ…. Yea… unable to perform… riiiiight….
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Well one good thing also
It a
Retroboy said:
I just re checked and I went to 6.40 with the M1. There's even more to the story if you're interested. The 6.31 was with a Torquer and a 750 alcohol DP. The air gap also had the same DP carb with no changes. The M1 that picked up massively over the air gap was with 98 octane pump gas through a Holley 870 Vac Secondary running fat as. The change from Methanol to Pump gas has killed my MPH from a previous best of 113 to 108 MPH over the 1/8th.
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Interesting info thank u
 
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