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Old 05-07-2013, 03:03 AM
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tunnel ram 302 windsor

Hey all, coming at you from downunder. I've got myself a 302W in my 4x4 and i'm looking to do some mods. Basically its got a CJ5 jeep 3 speed and transfer in it, and ends in 4.11 gears. So gearing is short. I've bought a weiand model 1988 tunnel ram and a set of headers for it. Basically the motor is stock standard, and i'm just going for looks. It's pretty much a aussie billy bubba redneck kinda thing.

I've got the adaptor plates to go from square bore back to 2 bbl and am thinking about a pair of 350 holleys. It's only a street cruiser. it's a big, heavy over weight 4x4 with a 3 speed manual and short gears. so no prizes on the drag strip. The parts i've bought are starting to roll in, but am stumped on the following:

1) How a standard 302W (with headers) will run with a pair of 350 holleys
2) How to properly vacuum advance both carbies
3) Approx what jetting and power valves i'm going to look at
4) Whats the go with being told the standard distributor won't clear the ram
5) Anything else I might need to know??

I'm pretty much a back yarder type, but love getting my hands dirty and trying things for myself. I don't want to buy a rod. I want to build one. I've got my own very distinct taste in what i'm chasing. Plus the car i'm starting with is rare as rocking horse s**t as there was only 432 made in the world.

Any help is much much appreciated.

Thanks, Alex.

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Old 05-07-2013, 05:46 AM
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I admire your determination.. Tho most of what you ask will be trial and error. Probably have to go with an aftermkt small cap dizzy. Will probably run a little soggy untill the revs are up..Good luck!!
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Old 05-07-2013, 07:48 AM
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why not use 2x550 4 bbls,you can disable the secondary linkage for now and if you decide to build the 302,then you have the correct carbs
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Old 05-07-2013, 08:30 AM
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G'day mate!!
Did you know about using an offset dizzy on your 302 for clearance.
Here's a link to one.
Swartz Racing Manifolds - Custom Billet Products
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Old 05-07-2013, 08:33 PM
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I ran 2 460 Holleys on a T/Ram on my 302 in my '41 Willys pickup on the street,I put the "black"(hardly ever came open) springs in the vacumn secondaries and it ran great on the street,I had a 4speed and 4.56s though
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Old 05-08-2013, 12:14 AM
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While you can make pretty much any carb work,,, Any carb will need advanced tuning on a tunnel ram.
Why not use two 500cfm Edelbrock AFB's. They even sell a pair that come set up for dual quads
so the jetting tuning will be not that hard to get these dialed in on a tunnel ram.

The tunnel ram will like rpm and needs more time to warm up than a stock manifold.
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Old 05-08-2013, 02:44 PM
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You only need to connect vac advance hose to one carbie.
Start with the stock jetting. Start with new carbs or a pair rebuilt by an expert you trust. Otherwise you may have all kinds of mods in them that make bad behavior.
You don't need an offset dizzy, just a small cap type - same size cap as a points type.
Have fun! Your plan for two small 2bbl is good. Use whatever pair of good carbs you can get cheap so long as they are 600cfm or less, and do not use double pumpers.
I sell a product that would be perfect for your combo, but what you are planning will work OK.
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Old 05-08-2013, 03:03 PM
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why 2bbls? Just do it the "not so cool traditional way" with 4bbl carbs and it'll work a lot better. And on a tunnel ram I would almost insist on double pumpers, or you'll have some lean cylinders when you stomp on the throttle...

run some square 4bbl double pump carbs and tuning will be MUCH easier as every cylinder will see the exact same thing. Or you can try a hodge podge of vacuum secondaries and accelerator pumps and hope and pray that it works well enough (which it likely will but it will be far from optimal).

Tunnel rams need carbs that provide even fuel metering to each cylinder, there's far less mixing than in a common single or dual plane intake.
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Old 05-08-2013, 03:22 PM
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The OP is going to spend 95% of his time @ part throttle. Read what he wants. You only get good fuel distribution with the DPs @ wide open. If his 2bbl adapters center the carbs above each group of 4 runners he will get good distribution.
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Old 05-08-2013, 08:29 PM
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thanks heaps for all the input. it really heaps. I did rush out and buy the adapter plates to step back to a 2bbl thinking that a pair of 350s linked together (not progressive at all) would work quite well. There are any number of 289s and holden (aussie chev) 253 & 308 motors that run 350 holleys for street cruising. this is purely for style. looks. to be honest with what i'm doing here i don't expect to win a drag race against an electric scooter but sure as s**t ill look good rolling down the road on 35's. but with the tunnel ram I think it really is trail and error, so i'll see how the 350s go, and failing that I might step up to the 465's cause the 390's are harder to get here. Being a stock motor i really don't think that ive got the grunt to need twin DPs, and a lazy old motor like this will probably flood if i boot it. I havent got any real advanced equipment here to check how many points rich the motor is, I basically go off the sound coming out and the color of the exhaust pipe and fumes. Stone age I know, but its all i've got. But im 25 so this is what true rodding is about yeah???

really thanks heaps guys. much appreciated.

Alex.
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Old 05-08-2013, 08:59 PM
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Consider 3 Holley 350cfm 2bbls on a tunnel ram.
Progressive linkage with the outer two as secondary carbs
center carb as primary.
Modify the tunnel ram top for 3 -- 2bbl
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Old 05-09-2013, 12:39 PM
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A lot of work that will give you worse distribution @ part throttle. Its a long way to the outer cylinders from that center 2bbl.
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