Looking for some input on carbs for a tunnelram. Motor is a 500 hp BBF and I'm currently running a Weiand TR with a pair of Holley 660 center squirters. I'm getting killed at the pump and want to make a change to something a little more miserly on the go juice.
Prior to the tunnelram I was running a Weiand Stealth dual plane intake and a single Holley 850 dp. Since I gained absolutely nothing (except for the piss poor mileage) by making the change to the TR, I figure I could pick some carbs that would put me around that same 850-900 cfm mark.
I'm toying with the idea of vacume secondaries, or possibly the Holley 450
4160 mechanical secondary. I see where Summit and Jegs are selling that 450 for $193 so the price is right. The question is............will I be in the same position I am now (right next to the gas pump) or is the linkage more progressive than the 660s I'm running? Does anybody know about this particular carb? It states in the ad This has a mechanical secondary, but no secondary accelerator pump circuit. It is designed for a mulitiple carburetor application ONLY, it will not function properly on a single carburetor application.
It sounds perfect and the linkage looks to be a lot more progressive than my "all or nothing" on the 660s.
http://static.summitracing.com/globa...hly-0-9776.jpg
Link to the Holley 4160 carb (http://store.summitracing.com/partde...5&autoview=sku)
I have buddies that are running BBFs with tunnelrams and 600 vac sec carbs. They work o.k. for them and their fuel mileage is way way better than mine so I reckon the vac secs would be o.k. but I'd probably go a bit smaller.
Any thoughts or comments on these two choices. Or any other possible choices to recommend.
Input appreciated.
Thanks
Dan