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Old 02-08-2008, 05:09 PM
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392 hemi guys, please step inside

anyone have any experience with the hot heads tunnel ram manifold on a mild 392? it appears to have pretty short runners and a smaller volume plenum as compared to other tunnel rams for other engines. which got me thinking that it may be more streetable. they claim a 2800 to 7800 operating range. the regular dual 4 weiand intake has a starting point of 2000rpm.

will that extra 800rpm make it a pain to drive?
its going into a 33 coupe, auto, 4.56 gears and 31 inch tires.
any ideas on what cam to run?
thanks greg

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Old 02-09-2008, 03:02 PM
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9.5 to 10.5 static compression ratio
2,800 to 3,000 stall converter
Isky #460128 hydraulic flat tappet. (Grind #288 Hyd.). Lopey idle. Use 750-780 carb or two 500's with choke setup on rear carb primaries. 288/0.480" advertised, 240/0.480" @ 0.050" tappet lift. 108* LSA. Use Isky anti-pump up lifters.
http://www.iskycams.com/onlinecatalog.html

The loose converter will get the motor past the sluggish bottom end. It should pull hard 3K to 7K.

This info will get you in the ballpark. Dial it in exactly by gettin' on the phone with one of the Isky tech guys. They're all sharp and have directed me properly in the past.

Be sure to use their recommended valve springs with whatever cam you decide on.

Last edited by techinspector1; 02-09-2008 at 03:19 PM.
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Old 02-09-2008, 04:42 PM
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thanks you sir, i'll phone the tech line on monday
any thoughts on running a six pack set up on the tunnel ran? 500cfm outers with a 350cfm center primary.
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Old 02-09-2008, 10:45 PM
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800 CFM is all the carb you'll need.
400 CID divided by 2, times 7000, divided by 1728 equals 810 CFM at 100% volumetric efficiency, 770 at 95%, so three 350's would work great or two 400's. I can't seem to find 400's anymore, so I suggested two 500's for you. Two 390 Holley 4-bbl's would work great too, but they're a little pricey.

P.S. Run a LARGE transmission cooler in front of the radiator so it gets maximum air flow. A loose converter will build a tremendous amount of heat.

Concerning the cooling system, you might get a few tips from this wiki article.
http://www.crankshaftcoalition.com/w...cooling_system

Last edited by techinspector1; 02-09-2008 at 11:01 PM.
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Old 02-10-2008, 09:55 AM
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jeez, you know everything!!
thanks man
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Old 02-10-2008, 12:00 PM
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Quote:
Originally Posted by techinspector1
800 CFM is all the carb you'll need.
400 CID divided by 2, times 7000, divided by 1728 equals 810 CFM at 100% volumetric efficiency, 770 at 95%, so three 350's would work great or two 400's. I can't seem to find 400's anymore, so I suggested two 500's for you. Two 390 Holley 4-bbl's would work great too, but they're a little pricey.

P.S. Run a LARGE transmission cooler in front of the radiator so it gets maximum air flow. A loose converter will build a tremendous amount of heat.

Concerning the cooling system, you might get a few tips from this wiki article.
http://www.crankshaftcoalition.com/w...cooling_system
techinspector, you'r right on. but i can buy those 390 holleys at swap meets for a dollar, they will need a rebuid and the rebuild kits are 29 dollars. so figure 2 dollars for 2 carbs, 60 dollars for rebuild kits, you will only be out about 62.99 dollars.--->the 390 holleys are the only way to go.
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