67 Big Block Intake Manifold Hood Clearance Question
03-17-2016, 01:38 PM
#21
Drifting
It is my understanding that there is fuel bleed under each secondary throttle blade for the purpose of keeping the bowl fuel in the secondaries fresh and fuel will bleed even at idle.
03-17-2016, 02:27 PM
#22
Melting Slicks
Another Calgarian here 
. Where do I find one of these 2bbl carb-to-4bbl manifold adapters with the model 4150 bolt & base pattern; any particular speed shop ? I'm going on my California break (Pomona etc.) in about 3 weeks, and could pick one up. It probably raises the carb by the thickness of the adapter; hope there's no hood clearance problems.
I have a late '69 stock 400hp set-up, and have installed it in the past on my mild BB. Only hooked up fuel to the middle carb, and disconnected the vacuum lines to the front & rear carb pods. Ran like a charm, with plenty of zip.
. Where do I find one of these 2bbl carb-to-4bbl manifold adapters with the model 4150 bolt & base pattern; any particular speed shop ? I'm going on my California break (Pomona etc.) in about 3 weeks, and could pick one up. It probably raises the carb by the thickness of the adapter; hope there's no hood clearance problems.I have a late '69 stock 400hp set-up, and have installed it in the past on my mild BB. Only hooked up fuel to the middle carb, and disconnected the vacuum lines to the front & rear carb pods. Ran like a charm, with plenty of zip.
http://www.summitracing.com/parts/trd-2087/overview/
There are Square bore ones too.
http://www.summitracing.com/parts/trd-2065/overview/
03-17-2016, 05:16 PM
#23
Pro
"The secondaries have constant feed restrictions for corrosion-free operation from restricted use."
I've never been able to locate these (but then I've never looked that hard
)
03-17-2016, 05:24 PM
#24
Pro
I got it through Summit Racing, this may be the one, I don't have it with me to check. Yes, it might cause a clearance issue but for short term testing, if that's what you are doing, you could leave the hood unlatched.
http://www.summitracing.com/parts/trd-2087/overview/
There are Square bore ones too.
http://www.summitracing.com/parts/trd-2065/overview/
http://www.summitracing.com/parts/trd-2087/overview/
There are Square bore ones too.
http://www.summitracing.com/parts/trd-2065/overview/
03-17-2016, 09:41 PM
#25
Melting Slicks
I tried running the secondaries without fuel lines and it was way too lean. After I made block off plates it ran fine on the center carb alone. (Well, until you tromp on it and it doesn't kick into Hyperspace)
These are the secondary idle slots:
03-18-2016, 05:24 PM
#26
Drifting
Interesting--------------I've never heard that before. What I know from experience is that when fuel is leaking from a carb, there will be vapor coming up through that carb when a hot engine is shut off. When ever I've seen vapor coming up through one of the carbs, the engine idles poorly and the carb needs rebuilding. After a rebuild, the engine idles fine and the vapor is gone (except for maybe just a little from the primary which quickly goes away).
12-11-2017, 06:54 PM
#27
Advanced
Thread Starter
12-12-2017, 11:11 AM
#28
Instructor
67 bib block hood clearance
converting to efi seems like an awful lot of work. I've had 2 tripower 67s over the years and have found them to be very reliable when in good condition. In fact, i just started my 435 car for the first time in 5 months, and it fired up without difficulty and runs great.
If you send your carbs to eric jackson for restoration, i can just about guarantee they will perform perfectly right out of the box. Even on 10% ethanol pump gas.
If you send your carbs to eric jackson for restoration, i can just about guarantee they will perform perfectly right out of the box. Even on 10% ethanol pump gas.
12-13-2017, 11:07 AM
#29
Race Director
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The L-79 and L-46/82 cams with full time vacuum advance and total idle advance in the mid to high 20s, idle well at 14-15" @ 750, and base engines about 18" @ 500 with total idle advance in the low to mid twenties.
All of the above is with manual transmissions idling in neutral. Autos will pull less vacuum at the same idle speed in Drive.
Idle vacuum is dependent on valve overlap, idle speed, and total idle advance, so any idle vacuum reading should be accompanied by engine speed and total idle advance or the number is meaningless.
Duke
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Coe56 (12-13-2017)
12-13-2017, 07:39 PM
#30
Advanced
Thread Starter
With full time vacuum advance (requires a 12" B26 VAC to replace the 15.5" OE 201 15 to pass the Two-Inch Rule) and 6-10 initial (for total idle advance of 22-26 deg.) about 14" @ 900, which is pretty good compared to 12" for the LT-1/Duntov cam and only 10" for the 30-30 cam at the same 900 idle speed and total idle advance in the high 20s to low 30s range.
The L-79 and L-46/82 cams with full time vacuum advance and total idle advance in the mid to high 20s, idle well at 14-15" @ 750, and base engines about 18" @ 500 with total idle advance in the low to mid twenties.
All of the above is with manual transmissions idling in neutral. Autos will pull less vacuum at the same idle speed in Drive.
Idle vacuum is dependent on valve overlap, idle speed, and total idle advance, so any idle vacuum reading should be accompanied by engine speed and total idle advance or the number is meaningless.
Duke
The L-79 and L-46/82 cams with full time vacuum advance and total idle advance in the mid to high 20s, idle well at 14-15" @ 750, and base engines about 18" @ 500 with total idle advance in the low to mid twenties.
All of the above is with manual transmissions idling in neutral. Autos will pull less vacuum at the same idle speed in Drive.
Idle vacuum is dependent on valve overlap, idle speed, and total idle advance, so any idle vacuum reading should be accompanied by engine speed and total idle advance or the number is meaningless.
Duke
That's a lot more vacuum than I'm getting now, so I need to find out why. I suspect a leak on the intake manifold somewhere. I think the car has been cammed, (it certainly idles like it) but I don't think that would account for the low reading I'm getting. Time for some diagnostic work.....