Power brake swap question
I think yur talking about the vertically offset Dual Diaphragm unit which is correct for early 70s. They work well on engines that run high vacuun at low rpm such as all stockers,lol. But once your idle vacuum drops below 10inches or so, they get a lil lazy. First time out, in the morning I had to blip the throttle a couple of times to charge the booster, but it was otherwise fine on my 68 Barracuda. On a 273-360, the vertical offset is IMO a good thing.
Having said that, I prefer the later single-diaphragm,73 up units. Better feel,lighter pedal,earlier on-line, stays on-line. They seem to always be set up too sensitive. So adjust the pushrod shorter for less, smack your forehead on the dash, boost.
I think yur talking about the vertically offset Dual Diaphragm unit which is correct for early 70s. They work well on engines that run high vacuun at low rpm such as all stockers,lol. But once your idle vacuum drops below 10inches or so, they get a lil lazy. First time out, in the morning I had to blip the throttle a couple of times to charge the booster, but it was otherwise fine on my 68 Barracuda. On a 273-360, the vertical offset is IMO a good thing.
Having said that, I prefer the later single-diaphragm,73 up units. Better feel,lighter pedal,earlier on-line, stays on-line. They seem to always be set up too sensitive. So adjust the pushrod shorter for less, smack your forehead on the dash, boost.