[MidOHasp]

Bruce,

I think in the past 3 days I've come across half your posts. You seem to know what the heck you're talking about.

Are mechanical secondaries an inherently bad thing? When I put together the spec sheet for my motor, some of the logic I used was more based on what I called 'common sense' at the time but was really not based on a lot of good info.

I chose the Speed Demon 750 double pumper on a 408 turning 6500rpm. The "Holley" number would be 767. We're really turning 6K rpm now, though, and that "number" is 708.

My logic was - it's a stroker so it is going to be a torque monster. It's a light car. Should be able to use everything the carb can supply. It seems to have worked.

I basically had a boner for a double pumper because when I think of vacuum secondaries, I think of stock 200hp V8s from the early 70's. But I've read some info in your most recent post that indicates to me that the vacuum secondary makes sense because you will be dumping fuel/air mixture at the rate you can use it as opposed to however fast the carb can dump it.

In what situations do you say, "double pumper makes sense, no need for vacuum secondaries." ??

I wish I could hang out in the all shop talk forum all day, but I'd get fired. What an education you all provide.

JP