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By oldnuts - 15 Years Ago
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I'm thinking of running an interceptor intake on my 64 292. Any one have any info I should know before I start work on it. I'm going more for look than performance.
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By Y block Billy - 15 Years Ago
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I know marine carbs are set up a little different than street to take the vibrations and poundings of the waves, the floats and venting are different so they don't bounce around letting excess gas in when the boat rocks and then splashing it out the venting creating a fire hazard. I don't know the specifics and I know it is not good to use a streat carb on a boat but the other way around shouldn't be a big problem. I think jetting is very fat on marine carbs so you may have to do some jetting work. They must use some type of marine carb on those off road race buggies to take all the jumps, I'm not sure what they use.
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By Riley - 15 Years Ago
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Side draft or down draft manifold?
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By oldnuts - 15 Years Ago
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Its the dual carb side draft
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By Riley - 15 Years Ago
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I'm new to Y blocks and knew nothing about them until last year, but now own a beautiful 312 in a boat with a down draft set up and a 256 with a side draft set up that I will be parting out in the spring. My understanding is the side drafts run well if set up correctly. Apparently they have a tendancy to puke gas out if not set up right creating a fire hazzard in a boat. At some point Interceptor started using valley pans that were recessed to allow the gas to collect in the pan rather than running into the bilge. They used them for the low profile they had, allowing the boats to have a lower motor box. Many engines have been converted to downdrafts because of the difficulty in getting them to run right, however, a person I know has them in his boat and says if you're somewhat manchanically inclined and understand carbs they are not hard to set up and keep running good. They are cool looking.
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By MoonShadow - 15 Years Ago
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They used the same basic carbs on the scrubvette blue flame six in 53/54. So I think they would work. Not a lot of CFM but definitely different. I believe the deep valley pan was to allow for the low set manifold and linkage rather than a gas collector. You need that pan plus the connectors for the water passages that fit on the front of the manifold. Chuck in NH
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By HT32BSX115 - 15 Years Ago
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Howdy,
I am going to try a "marine" carb too. It's a Holley 4160 that I removed from my previous OMC 460 King Cobra stern drive after I "parted it out"
I will be rejetting it...... it also has vacuum secondaries so I don't really expect many problems with it.
the Interceptor setup could be a problem in a non-marine application only because of possible vapor lock due to the carbs being much closer to the heat source (in the "valley") and the fact that the engine will be running "hotter" than a marine application. Most marine engines use a 140* t-stat and use an unlimited "heat sink" (the lake)
Your Y should probably use a 180* 'stat which will make the under hood and "up close and personal " temps much higher.
I like that manifold and carbs too. I think they look at least as cool as the 3x2 set up.
Cheers,
Rick
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By GREENBIRD56 - 15 Years Ago
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I was thinking this would be a great way to mount a pair of throttle bodies for an electronic injection system...............
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By Flying Jester - 15 Years Ago
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I was under the impression marine equipment was always better than street machines.
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By oldnuts - 15 Years Ago
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Thanks for all the info guys. do any of you know the cfm of the sidedraft compared to the factory 2bbl the 292 comes with?
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By oldnuts - 15 Years Ago
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Anyone know of any vintage boat/engine sites where parts maybe sold?
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By Riley - 15 Years Ago
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I'm told 2 YHs have less cfms than a 4Brl. I would think they would be equal to or greater than 2 brl. As far as heat goes, does your manifold have the exhaust port or furnace? One that I saw one on ebay did have it which surprised me as I don't know why they would put one on a manifold designed for marine use. The downdraft manifold on my 312 has one that I would like to block it off as I don't like the look of burned paint and I'm told that it is not needed on a boat. Do most people block them off on their cars? Try the Interceptor section at marineengines.com.
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By oldnuts - 15 Years Ago
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Yes mine has the exhaust x-over and I was wondering if you could plug it also. I'm new to y blocks and haven't seen to many people running marine parts on street cars.
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By Bob's 55 - 15 Years Ago
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Yes you could block it off or used the restricted gasket for trucks (i think). Also the side draft carbs are the same Carter 1 Barrel that is used on the Corvair Syder (Turbo Charged). and the Blue Flame Corvette six.
They shouldn't be too hard to tune using a Uni-Sync.
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By 59flatbedford - 15 Years Ago
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did they make a 2barrel marine carb that was set up like the normal one. like could you take one and bolt it on a normal 2v intake and run with it. just thinking cuz if they have baffels and stuff in the fuel bowls that would be awesome to keep fuel from sloshing around when im driving on rough mountain roads.
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By MarkMontereyBay - 15 Years Ago
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I explored the marine manifold years ago trying to find a cheap way to use Ford EECIV EFI multiport injection on a yblock. I bought the whole marine enchilada from John Mummert, who had one hanging on his wall, including the little coolant bypasses with the tiny thermostats in them. Trying to fit injector bungs into 8 uniform places on the manifold was futile. The air flow in the manifold itself seemed very clunky and the carbs are small. The crossover part of the intake is narrow and would really restrict any serious flow. I think starting with some log intakes would be a better place to start and fab some runners and a common plenum with a throttle body. The marine manifolds were made for cruising quietly around on the lake not for any power applications. Now I have the thing hanging on my wall.
Mark Hebard
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By oldnuts - 15 Years Ago
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Mark would you want to sell the valley pan and coolant bypasses? I'm goin for looks over performance so the power issue don't bother me.
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By MarkMontereyBay - 15 Years Ago
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I don't remember having the valley pan now that I think about it. The coolant by-passes, carbs and linkage are buried somewhere in the my garage catacombs. I look around but not sure where they are and if I see that I actually still have them I will let you know.
Mark
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By mctim64 - 15 Years Ago
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Those set ups look pretty cool, I've had a couple and sold them, kinda neat on a roadster. I think the Carter YH is like 190 cfm but if you look at how the are mounted back to back I don't think this could be a very efficient flowing manifold, good for low profile though. 
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By Timbo from Mempho - 15 Years Ago
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I think I have a marine valley pan, I will look tonight and make sure it is usable.
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By Ted - 15 Years Ago
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oldnuts (1/20/2010)
Anyone know of any vintage boat/engine sites where parts maybe sold?Many of the older marine salvage yards around the larger lakes and waterways still have these pieces laying loose.
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By oldnuts - 15 Years Ago
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Timbo from Mempho (1/21/2010)
I think I have a marine valley pan, I will look tonight and make sure it is usable.awesome let me know what you come up with
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By MarkMontereyBay - 15 Years Ago
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Oldnuts,
I found the marine interceptor and parts this afternoon. I have the manifold, carbs, some of the linkage and the coolant bypasses with the t-stats still in them. Not sure about what to do with this stuff. I am not intending on using it but I am reluctant to separate the bypasses from the rest for now. I will probably try to parlay this and some other stuff for an Edelbrock 573 or some Stromberg 97s. I will let you know first if I decide to let the bypasses go separately.
Mark Hebard
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By oldnuts - 15 Years Ago
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sounds good
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By AussieDrew - 12 Years Ago
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Dear Steve I've just seen your posting. Did you have any luck with combining the interceptor intake with fuel injection? Did you learn anything about the possibility? I am interested in doing the same thing and would be very grateful for anything you can tell me. Tx. Drew
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By SkylinerRon - 12 Years Ago
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It should be fairly easy to build a Man-i-fre 4x2 style set-up from the marine intake which should work very well on the y type ports. Goodluck, Ron.
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