Dove High Riser Tunnel Wedge Problem

[Smokin427]

Thanks for the all the info. Barry, I am the person who you were trying to find BT HR heads for. I gave up and redid my original iron HR's. I raised the bottom of the ports approx 1/2 inch and increased the flow about 50 cfm at .600. I have an excellent custom Ray Tirri valve job with 2.25 and 1.75 yet not shrouded. I do run the (true double pumper) Pro Forms front to back with dual primary metering blocks in each. I did this so I could use a power valve in the secondary side and therefore keep the secondary jets smaller to help the drolplet size. The carbs have 76 primary jets, 80 secondary jets with dual 55 power valves. The AFR's are excellent with this combo. I had to make the spacers to keep the front bowl above the distributor. The front spacer hole is sloped 3/4" to move the front carb forward since the Dove intake is closer center to center than the original Ford dual plane HR intake. It also matches the hole in my hood and the custom fuel logs on each side of the carbs that I use (i use 2v bowls to get dual feeds without the crossover tubes). The car is a 66 Fairlane with 4:11 posi, 26" drag ardials, and a 2:84 low gear (Tremec TKO 600). I tried 34 and now 38 degrees timing with 100 octane but noticed almost no difference. I am an old timer (67) so I drive it daily since life is short. My low power issue is in comparison to my pre rebuild much worse head flow, dual plane ford intake. I had a Comp Cams 256/266 on a 108 with .595 net lift before so I have cutback the overlap with the new profile. I used a single duration for both intake and exhaust since my heads exhaust flow is about 78% of the intake flow. The previous combo pulled hard starting at about 3500 almost like a passing gear, but I don't feel that at any rpm now. I am thinking about putting a wedge shape filler in the intake ( to reduce the plenum volume) if you think that may help (think of it as a mountain range running front to back under the carbs. Also wondering about redsigning the 2" tall carb spacers to each have 4 holes rather than 1 square hole to maybe help with the signal.

[blykins]

Adding some turtles is probably a good idea, but I don't think it will help much. It doesn't seem like you need a "signal", I suspect you're just having velocity troubles because every volume is just so large.

What happens when you get it up over 6000?

If you can't change the spacers, could you go with a steeper rearend gear?

[olddog]

Originally Posted by Smokin427

I am thinking about putting a wedge shape filler in the intake ( to reduce the plenum volume) if you think that may help (think of it as a mountain range running front to back under the carbs. Also wondering about redsigning the 2" tall carb spacers to each have 4 holes rather than 1 square hole to maybe help with the signal.

I was thinking the same thing.

I can see how too much plenum area could cause fuel droplets, poor idle, poor throttle response, etc. I do not understand how it could cause low torque in the mid rpm range. I would think the runner length and area would be the biggest factor, as far as the intake manifold goes.

I do not know many things and would be pleased to learn more on this subject.

[blykins]

No velocity.....the same reason why the fuel can fall out of suspension. A large amount of air has momentum and inertia. It takes a lot to get that air moving and to keep it moving.

I've also seen carb spacers cause the fuel to fall out of suspension and pool, especially on some dual plane intakes.