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File comment: My VC in fron of the old Bank of New Zealand, Raetihi
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Welcome to the site, Mark!
This sounds like a nice project. Some will tell you that the carb heat from the rear modified stock manifold is highly desirable. Since this is an occasional use vehicle and you are having someone else do the work, my feeling is manifold heat is not so important as ease of fabrication and certainty of building a reliable system without tons of input from you. If it were me, I would go with the Dutra Dual manifolds front and rear and have them build a Y-pipe (primary pipes) that uses 2" diameter tubing. Get a Flowmaster or Magnaflow or similar Y-junction pipe and then run 2.5" single from near the transmission X-member out to the back of the car. I like the Jones exhaust quiet flow mufflers, which make a little noise but are still not too loud. You will need a mini starter to clear the rear Dutra manifold, most likely.
Since you already have a factory 2bbl on a factory manifold, you will not gain much by going to an aftermarket manifold and carb on a stock engine. You might want to increase the jet size on the carb after the exhaust switch. Get the exhaust shop to weld a bung into one of the head pipes about 18" beyond the Dutra manifold exit so you can run an air-fuel meter for carb tuning, should you want to do that now or later. You can always plug the bung for now.
Well, that's some initial thoughts. I/we can provide further input of course!
BTW, Christine and I spent a wonderful 5 months in Wellington, NZ in 2005. Really thought about moving there... EnZed is amazing.
Lou
Many thanks for your helpful comments Lou. This sounds like a nice project. Some will tell you that the carb heat from the rear modified stock manifold is highly desirable. Since this is an occasional use vehicle and you are having someone else do the work, my feeling is manifold heat is not so important as ease of fabrication and certainty of building a reliable system without tons of input from you. If it were me, I would go with the Dutra Dual manifolds front and rear and have them build a Y-pipe (primary pipes) that uses 2" diameter tubing. Get a Flowmaster or Magnaflow or similar Y-junction pipe and then run 2.5" single from near the transmission X-member out to the back of the car. I like the Jones exhaust quiet flow mufflers, which make a little noise but are still not too loud. You will need a mini starter to clear the rear Dutra manifold, most likely.
Since you already have a factory 2bbl on a factory manifold, you will not gain much by going to an aftermarket manifold and carb on a stock engine. You might want to increase the jet size on the carb after the exhaust switch. Get the exhaust shop to weld a bung into one of the head pipes about 18" beyond the Dutra manifold exit so you can run an air-fuel meter for carb tuning, should you want to do that now or later. You can always plug the bung for now.
Well, that's some initial thoughts. I/we can provide further input of course!
BTW, Christine and I spent a wonderful 5 months in Wellington, NZ in 2005. Really thought about moving there... EnZed is amazing.
Lou
Yes I enjoy Wellington too and was out fishing there last week actually.
I'll go for dual dutras and see how I go. I note that AussieSpeed here in Australia has now modified the rear Dutra to avoid the starter motor issue. See http://www.aussiespeedshop.com/product/ ... 0567-pair/ - I just ordered a set.
Kind regards
Mark