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engine upgrade help
I'm currently running Edelbrock Performer intake on my 71 with L48 engine.
I'm thinking of going EFI way with sniper EFI. I was looking at Edelbrock 7501 Performer RPM air-gap and Blueprint H8002K heads when doing this. Was also looking at camshaft change but that is hard to choose as there are soo many. The closest I got was Howards 111145-12 but tech support suggested CL113215-10. Otherwise the engine is stock. Do I have to change the intake to run Sniper or is spreadbore intake OK? Is anybody running upgraded engine with stock TH400, that includes converter, with EFI? |
Spread bore/Square bore is no different to the EFI as long as your intake is dual drilled (which I believe yours is) for the Square bore bolt pattern. The real question you should be asking is “Dual Plane or Single Plane for the Holley Sniper?” There are known metering issues running a dual plane intake with that EFI system. Single plane intakes allow all runners to share all injectors, allowing the sniper to to operate more efficiently. Choose your heads first and wisely. Cams come and go, but heads are usually there to stay. Be realistic about what you want out of the engine and understand the limitations of the stock internals. |
Well air gap intake has that small plenum divider cut so shouldn't be an issue!
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I'm thinking,, if you already have the air gap intake, ok, use it,,, if your going to purchase a new intake, don't get the air gap,,,,, EFI will be happier with single plane style,,,,,just my $.02,,:thumbs:
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Originally Posted by Primož Krajcar
(Post 1598035962)
Well air gap intake has that small plenum divider cut so shouldn't be an issue!
-Stroke |
Well then it is a Torker II manifold for me or Weiand team g.
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Performer RPM
https://cimg1.ibsrv.net/gimg/www.cor...37a0c55753.jpg
Performer RPM with Dart heads, ZZ9 Cam. Perfect combo, 450hp |
Was running a 2101 and a spreadbore before switching to the Sniper EFI, but wanted a square bore manifold. Went with the EPS manifold then read articles about dual versus single plane with EFI, so the new manifold was modified. Been running excellent all summer. T
https://cimg7.ibsrv.net/gimg/www.cor...460e1dc124.jpg |
Originally Posted by Stingre'
(Post 1598045300)
Performer RPM with Dart heads, ZZ9 Cam. Perfect combo, 450hp
I thought that air-gap is higher due to the design. Both have same rpm range 1500 - 6500 rpm. |
Originally Posted by Primož Krajcar
(Post 1598047884)
Interesting. I checked, Performer RPM and RPM air-gap have the same intake manifold height.
I thought that air-gap is higher due to the design. Both have same rpm range 1500 - 6500 rpm. I like Terry's solution. Intake wave tuning is intake wave tuning; there's no getting around it; the longer runners with a dual plane intake is going to prop up the low and mid-RPM torque curve; why lose it? The air / fuel distribution issues of a dual plane are there with a carburetor*why is it so much of a bigger deal all of a sudden when it's a computer dumping the fuel into the venturi's rather than a dumb carb??!? Adam |
Originally Posted by NewbVetteGuy
(Post 1598048034)
Are you sure about that??* There were some very long C3 intake height and hood height threads and the consensus*was that the Performer RPM and Performer Air Gap (non RPM) would both clear the later C3 hoods, but the combination of RPM+Air Gap's increased height made hood clearance a real problem in a C3 stock hood.* -If there IS a height issue with RPM+AIR Gap get the Air Gap and just cut down the divider.* The colder air is what you want and cold start won't be an issue with EFI.
I like Terry's solution. Intake wave tuning is intake wave tuning; there's no getting around it; the longer runners with a dual plane intake is going to prop up the low and mid-RPM torque curve; why lose it? The air / fuel distribution issues of a dual plane are there with a carburetor*why is it so much of a bigger deal all of a sudden when it's a computer dumping the fuel into the venturi's rather than a dumb carb??!? Adam |
Interesting comparison of the intakes from Hot Rod website from 5 years ago
https://cimg0.ibsrv.net/gimg/www.cor...1be9545cf3.png |
One of those Weiand manifolds might be a single plane and by all reports an excellent manifold. T
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Originally Posted by Primož Krajcar
(Post 1598048369)
Interesting comparison of the intakes from Hot Rod website from 5 years ago
https://cimg0.ibsrv.net/gimg/www.cor...1be9545cf3.png Adam |
Originally Posted by terrys6t8roadster
(Post 1598052180)
One of those Weiand manifolds might be a single plane and by all reports an excellent manifold. T
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youll go past that 1-2k mark so quick not sure it matters they will all do well off the line.
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Here is the link to the full article:
https://www.hotrod.com/articles/dual...d-comparisons/ I can't find part 1 though! |
Originally Posted by Primož Krajcar
(Post 1598054660)
Here is the link to the full article:
https://www.hotrod.com/articles/dual...d-comparisons/ I can't find part 1 though! https://www.hotrod.com/articles/19-s...-intakes-test/ Adam |
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