was wondering, is the port in the manifold, just below the carb, the PVC connection? (where I have the cutout on my pattern)
... believe all PCV's used the manifold to carb alum. OEM adapter. Lower manifold port would be used for Auto tranny Modulator vacuum and accessory vacuum taps for vacuum wipers, coolant switched advance emissions 2-way diaphragm dist,' etc... . Holley 2300 2bbl, 4bbl , AFB, etc have 3/8 vac port integral.
Put your finger over ported vacuum - there's almost no vacuum (and no advance) at idle with throttle blade in position for that port. Manifold vacuum to distrib' adds advance at idle.
have fun
.
,,
![](/proxy.php?image=https%3A%2F%2Foimg.photobucket.com%2Falbums%2Fv296%2FPowerband%2FSUPERCHARGER%2520PPROJECTS%2Fth_IMG_0946_zpsqqya26m6.jpg&hash=956f9c70923a589c2a361fffbf098a96)
AUTOMATIC:
![](/proxy.php?image=https%3A%2F%2Foimg.photobucket.com%2Falbums%2Fv296%2FPowerband%2FCARBS%2520HEADERS%2520EXHAUST%2520INTAKE%2Fth_IMG_2492_zpsr1sclnla.jpg&hash=70a590b08ebc465d7bef8f884adc3f10)
... believe all PCV's used the manifold to carb alum. OEM adapter. Lower manifold port would be used for Auto tranny Modulator vacuum and accessory vacuum taps for vacuum wipers, coolant switched advance emissions 2-way diaphragm dist,' etc... . Holley 2300 2bbl, 4bbl , AFB, etc have 3/8 vac port integral.
Put your finger over ported vacuum - there's almost no vacuum (and no advance) at idle with throttle blade in position for that port. Manifold vacuum to distrib' adds advance at idle.
have fun
.
![](/proxy.php?image=https%3A%2F%2Foimg.photobucket.com%2Falbums%2Fv296%2FPowerband%2FCARBS%2520HEADERS%2520EXHAUST%2520INTAKE%2Fth_IMG_0972_zpsfcpudbfw.jpg&hash=017628b15cc2bcfece829e45522f5722)
![](/proxy.php?image=https%3A%2F%2Foimg.photobucket.com%2Falbums%2Fv296%2FPowerband%2FSUPERCHARGER%2520PPROJECTS%2Fth_IMG_0946_zpsqqya26m6.jpg&hash=956f9c70923a589c2a361fffbf098a96)
AUTOMATIC:
![](/proxy.php?image=https%3A%2F%2Foimg.photobucket.com%2Falbums%2Fv296%2FPowerband%2FCARBS%2520HEADERS%2520EXHAUST%2520INTAKE%2Fth_IMG_2492_zpsr1sclnla.jpg&hash=70a590b08ebc465d7bef8f884adc3f10)