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Thread: Tunnel Ram Tuning Tips

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  1. #1
    EASYSTROKE
    Could anyone give me some tuning tips for my setup. I have a 10.1 454 with a mild hyd cam runnning ported oval port heads,bassett ot headers, and a weiand tunnel ram with two holley 600 vac secondaries. Anyone have any jet size suggestions. I have already been told to install lighter springs for the secondaries. Any other info would be appreciated. I also read an aticle that said the tunnel ram likes more timing advance at low RPMS to help drivability.
    Thanks,
    easystroke

  2. #2
    Junior Member
    Join Date
    Nov 2013
    Posts
    1
    Hi everyone, I was wondering if EASYSTROKE ever got his Holley 600 vac. sec. carb's worked out. I realize that this post is years old, but I too now have a 18' 86 Caribbean jet boat now and I just built a fresh 467ci BBC with a tunnel ram intake with a pair of 600 cfm Vac. secondaries #4160 and all is great, BUT I've been chaseing a WOT miss. It's driving me nuts!@..LOL I really enjoyed reading Hotcrusader76 information, I would love to hear from you guys. I have #69 jets up front I have opened up the (PVCR) from .041 to .050 to just enrichen the primary side at WOT. I have a 6.5 pv in and crusing is great at 3,000-4,000 it has 12" hg, and the vac sec. are opening on time and staying open. My only concern is it's not hitting clean on all 8 at WOT, to me it feels like it still wants more fuel.. Secondary jet size is 81, I have installed the Quick Fuel metering plates in the rear with jet extensions. Total timing is @ 36deg. -6 fuel line to a Holley reg. right beside the carb's with -6 hard line to each carb primary bowl. I didn't build a "killer" engine, just want it to look good and run good, cam is from Comp. .578 lift & 244@.050 110 LSA. jet boat cam rpm is 2,500-6,500...I see 5,500 and that's it, but that's ok, I just want it to hit clean at that rpm. Any info would be great, thanks.....Hans

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