Biggest difference is that Cam B provides 15-17"hg vacuum at idle.or it would if it wasn't defective. similar basic specs, but a wider 110 LSA and HP / Torque were within the same basic range. SO! after much hand wringing, I finally buckled and ordered Cam B. I ordered a supposed "low vacuum signal" modulator that should work at 12 -15hg, but that's still much higher than the best 9" I could expect from Cam A. Even with the adjustable vacuum modulator adjusted all the way (including actually removing the screw) it takes at least 15" hg to get the plunger to move. I was reading the instructions on my new TCI street-fighter transmission, and my plan fell apart - apparently I need at least 12" hg to activate the vacuum modulator. I chose a cam for my new engine (we'll call it Cam A) and knowing it would, at best, only pull around 9" hg at idle, I also bought a vacuum pump and can for the brakes, etc. I've started a project to replace my stock l48 in my 78 Corvette and I thought I had everything researched properly. My basic question is: Does anyone run a cam with a low vacuum signal at idle (10"hg +/-) and still use a TH350 transmission in stock configuration, and if so, how is it working for you? I'm using a new Th350 "streetfighter" from TCI. Hello folks - First a big thank you for all the help, I've been picking tips out of these forums for a while, so thanks.
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