Tunnel Ram on a chevy 305? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-06-2008, 07:46 PM
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Tunnel Ram on a chevy 305?

Hey im pretty new to chevy small blocks and my set up is a 73 c/10 longbed with a 305 that was just rebuilt. It also has a granny 4 speed tranny so really low gears. I want to basically put a new cam and lifters and rockers and intake and carbs and exhaust plus msd ignition on it. I really like the tunnel ram look and by reading up on it it seems like a pretty good deal except im not sure of it since my gears are so low i dont think my RPMs go up really high. I have an edelbrock performer 750 cfm carb on it right now and it floods the engine and I cant get it to run good without running rich. But hey my real question is in your opinion what would be a good set up for a small block chevy with the things im gonna do to it? cam,intake,carb, ect. Its basically going to be my rat rod nothing to fancy just as much power as I can get from my engine.

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Old 04-06-2008, 07:51 PM
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You need to up the cubes or decrease your cfms. 750 Edelbrock can be large even for a 350 and is definitely too big for a 305. Your tunnel ram idea would be better on a 350 or 383.
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Old 04-06-2008, 07:52 PM
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You'll feel more power out of that truck by just keeping your performer manifold, putting a 600 (or smaller) CFM carb on it and doing a cam swap (I'd consider this last) to an RV cam. A tunnel ram, if you're actually looking for a drivable truck, is pretty much completely out of the question. You don't have the cubes or the heads to bother with it. You can get a nice running motor for low bucks in your case, however.

I would also hold off on the MSD ignition if you've already got an HEI unit. That's plenty for this application.

I'm assuming this was a stock rebuild, was it?

K
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Old 04-06-2008, 08:02 PM
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Its got pretty much stock everything except for the carb. This truck was given to me and I dont really care much about the money except I dont really want to rebuild the bottom end and bore it out since it was just done lol. soo Im basically looking for the most power out of it that I can buy and not have to machine.
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Old 04-06-2008, 09:39 PM
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As said above, with a STOCK 305, 327, 350 a tunnel ram would be the worst thing you could do for a streeter. You can make the 305 perform with the right combination of parts. Do a search for 305 build up, its been gone over quite a bit.
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Old 04-06-2008, 09:52 PM
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A tunnel ram is not a good manifold to bolt onto a stock low cr motor.
It likes high rpm and needs a stiff rear gear and 10:1 cr . if you want to use a tunnel ram on a 305 you need 2 small cfm carbs 2 450cfm carbs would be good.
You'd want some thing like a 5.13:1 rear gear ratio for your truck to keep the rpms up while driving to keep the tunnel am happy.

higher compression ratio 10:1
2 small cfm carbs vac sec best possible 2(450cfm) or 3(progressive) 2bbl carbs (350cfm each)
high rear gear ratio (5.13:1 +/-)
high perf cam say 224-230@.050 .465" lift
recurved ignition advance curve (very aggressive, possibley locked out advance)

You want to gear the truck so that when you are cruising on the hyway at 60mph, the tach reads about 3500rpm. The rear gear ratio required will depend on how tall your rear tires are.
Once the motor and rear axle ratio is set up to match, a tunnel ram actually will drive quite nice. Not good for a stock motor, or stock gears thou.
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Old 04-06-2008, 10:21 PM
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Old 04-06-2008, 10:44 PM
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Ok ok haha sooo I guess the tunnel ram isnt going to work without putting a lot into the motor when I should just get a bbc if I want alot of power. so the next thing I guess is...what would be the best stuff I can shove in there that would give me some good horses out of it? AND I know theres a big difference in heads on the 305 and the 350s soo can I just put 350 heads on a 305 without changing the bore or the stroke And will that give me the better flow im wanting for more horses?
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Old 04-07-2008, 09:24 AM
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if you put 350 heads on a 305, it'll have extremly low compresion.

which heads do you have now? take off a valve cover and there is some numbers cast on the head somewheres
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Old 04-07-2008, 09:59 AM
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It has stock 305 heads... guess I should just put a mild cam in it and a performer intake with some headers for flow and call it good. Thanks for everyones help!
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Old 04-07-2008, 10:05 AM
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there are more then 1 "stock 305" heads. some are much better then others. they're usually dirt cheap to buy since nobody wants them
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Old 04-07-2008, 10:17 AM
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what about 327 heads cuz I have a 327 laying around here... and I have no idea what the numbers are or what the engine is pulled from.
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Old 04-07-2008, 10:18 AM
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327 heads might be 64cc or 76cc. either way it will drop the compression. stock 305 heads are between 52 and 60 cc
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Old 04-07-2008, 10:28 AM
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dang guess theres nothing i can do really huh?
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Old 04-07-2008, 10:44 AM
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you could bolt on better 305 heads
and a mild cam
and headers and a decent dual exhaust
scrap the msd idea and use a decent HEI unit
use a 500-600 cfm carb with vacuum secondaries
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