Considering adding Fuel injection
Race Director
Joined: Mar 2018
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From: Golden Colorado
According to one ad I looked at they offered different manifolds that had different carb pad heights. Going on memory I think the lowest was about 4.8 inches but look it up. My memory is not what it once was. 
Is my vette stock?? HAHA
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From: Im not allowed to tell you
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I used an old tartantula and added 2 inches of spacers to it and didnt have a problem function wise. But I have the L88 hood for the height.. Worked great all through the range but didnt get a chance to Dyno it
Last edited by Rescue Rogers; Dec 26, 2020 at 03:36 PM.
Advanced
Joined: Nov 2016
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From: Southern MD
It looks like you have a L88 hood in the picture. I have a 71 LS5 and I have the 4150 style manifold. It fits with a drop base for the air filter with no hood clearance issues with an L88 hood. I am not sure what the distance difference between the stock 454 hood and the L88 hood to carb base was. A member here used an XT manifold on a small block with an L88 hood and said he had no hood clearance issues.
Burning Brakes
Joined: Jan 2003
Posts: 961
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From: Frederick MD
I have been considering this also. I purchased an FI tech TBI but have not installed it yet. My question is can you elaborate more on the intake manifold choice. I have a dual plane but am not adverse to a swap to single plane if it will produce better results. Curious minds want to know.
The symptoms apparently is a off idle to mid RPM stumble that can't be tuned out. The forums are littered with folks arguing point either way.
Race Director
Joined: Mar 2018
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From: Golden Colorado
Thanks. I can see that. A single plane would almost have to have more equal distribution because of the closer to equal length of the runners! Now one has to wonder about the effect of LSA on the camshaft because of reversion also. Just thinking out loud.
Racer
Joined: Nov 2015
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From: Jackson SC
I'm going to use a dual plan on my small block...434... I honestly think it comes down - rock bottom - to what you are trying to do. I love horsepower, but if you have to wind it up to 8 or 9k --- that isn't in my comfort zone. For me, I love torque -- that pull your eye sockets out of the back of your head kinda torque....That is fun power to me......If you desire a high revving car that lives in the 7k to 10k range...A single plane would likely be a great choice. I honestly believe that when it comes to fuel injection and carburation there are still simple rules that still apply. What do you want to do with your little car?
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From: Sunshine Coast, Queensland, Australia
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Cruise-In VIII Veteran
Shortly after running my "77 EFI conversion" thread, I also had a thread going on the intake manifold side of things.
On my car I'm running a Performer RPM manifold. higher rise than a stock manifold to be sure. I had no issues whatsoever. However, I did cut out the center divider about 6 weeks after the initial install. can't tell any difference.
from all the reading I've done on the topic. those with manifold tuning issues generally have a standard low rise manifold.
On my car I'm running a Performer RPM manifold. higher rise than a stock manifold to be sure. I had no issues whatsoever. However, I did cut out the center divider about 6 weeks after the initial install. can't tell any difference.
from all the reading I've done on the topic. those with manifold tuning issues generally have a standard low rise manifold.
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Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,149
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
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The dual planes have been known to have various issues with a shallow air plenum on the one side. Cutting the center plenum divider out or using spacers seems to be a good resolution for some. I used the tarantula and had zero issues by using a big spacer. My big block build is getting a single plane because Im trying to limit the torque. The cam-intake-head combo im looking at is about 520Ft/lbs 510hp. Im trying to preserve my 5 speed until I can afford the new TKX. Hopefully we can get a group buy
Last edited by Rescue Rogers; Dec 27, 2020 at 04:54 PM.
Racer
Joined: Nov 2015
Posts: 250
Likes: 34
From: Jackson SC
The dual planes have been known to have various issues with a shallow air plenum on the one side. Cutting the center plenum divider out or using spacers seems to be a good resolution for some. I used the tarantula and had zero issues by using a big spacer. My big block build is getting a single plane because Im trying to limit the torque. The cam-intake-head combo im looking at is about 520Ft/lbs 510hp. Im trying to preserve my 5 speed until I can afford the new TKX. Hopefully we can get a group buy