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Old 05-04-2012, 05:24 PM
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When it comes to tunnel rams it's better toerror on the large side with carbs, not the small side. I've run tunnel rams on more than one car(all SBC engines) and I've tried various size carbs. My present car has a 327 bored .040" and I'm running a Holley Pro Dominator tunnel ram with twin 450 cfm carbs.
The Holley Pro Dominator is not as forgiving as those tunnel rams with longer runners and larger chambers. The short runners and chamber on the Holley make it tougher to get decent lowend performance. I just installed a Weiand tunnel ram on a 350 Chevy with twin 500 Edelbrocks and it took almost no fiddling out of the box to get them working. Idle was a little rich, so had to drop the metering rods to clean that up. I had rich idle on my setup also due to low vacuum, and I changed to 3.5 power valves and it cleared right up.
The Holleys will work better with larger nozzles and a larger 50cc pump. This will get more fuel into the large air mix and help get rid of the off idle stumble that most tunnel rammed cars have. Start with a set of numbered drill bits and see what size fits your nozzles, then bore them out a couple sizes larger. Drive the car and if it still stumbles you can open them up a little more until it clears up. Then go get nozzles for in that drill size, or just run what you modified.
I hope your car is running some low gears also! A heavy car with a SBC will probably work better with at least 3.90-4.10 gears. My little Austin is only about 2500 lbs. and I can run 3.73 gears and work well with my setup.

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Old 05-04-2012, 08:14 PM
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Thanks guys!!! I have thoroughly enjoyed reading these posts. I have definately learned a lot. Not all of it I completely understand but I get the idea. Tomorrow , hopefully I go and swap for all the parts. I am trading a Rockwell 50-017 drill press, BB cam, lifters , timing chain, 2 oil pumps and an edelbrock performer intake for a 351C-2v. Yes I had a Ford Mach 1 at one time... In return I am getting the tunnel ram+carbs and a 4blt 454 GEN IV block with ARP main studs and a fresh +30 over bore.
Tunnel ram will go on the 327 and the block will go on the stand!!! Stand by for more stupid questions on rebuilding, re jetting and over all setup of the carbs and tunnel ram!!!

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