601 heads with light porting flow numbers
Posted: Sun Dec 01, 2019 11:59 pm
This is a set of 601 casting 305 heads I've been dragging around with me forever. Stock 1.84/1.50 valves, 56cc chambers, amateur hour light bowl blend and general port cleanup, single angle 45* valve job. I've got about 2 hours in one head...time mostly spent cleaning out dirt dauber nests and spiders and a lot of dirt/crud.
Intake @ 28"
.025...15
.050...31
.100...58
.150...83
.200...100
.300...142
.400...177
.500...201
.550...210
.600...217
.630 (coil bind on the test spring)...217
Exhaust @ 28", no pipe
.025...13
.050...23
.100...46
.200...81
.300...106
.400...130
.500...143
.600...155
Exhaust @ 28", no pipe, switched to undercut stem 1.50" valve
.025...14
.050...26
.100...49
.200...88
.300...118
.400...141
.500...153
.600...164
.600 w/pipe...178
.650...172
.650 w/pipe...191
The ports were smooth and quiet at all lift points, and port speeds wasn't too crazy either. No port matching, or pinch opening, etc. I mostly just worked on the short turns and cleaning all the casting crud out of the ports, and blending everything in. It was also interesting to see the difference the undercut stem made on the exhaust side.
It was also sickening to see what a quick and dirty amateur job on these 305 heads did compared to several sets of ford heads that I have spent a LOT more time hacking on
Intake @ 28"
.025...15
.050...31
.100...58
.150...83
.200...100
.300...142
.400...177
.500...201
.550...210
.600...217
.630 (coil bind on the test spring)...217
Exhaust @ 28", no pipe
.025...13
.050...23
.100...46
.200...81
.300...106
.400...130
.500...143
.600...155
Exhaust @ 28", no pipe, switched to undercut stem 1.50" valve
.025...14
.050...26
.100...49
.200...88
.300...118
.400...141
.500...153
.600...164
.600 w/pipe...178
.650...172
.650 w/pipe...191
The ports were smooth and quiet at all lift points, and port speeds wasn't too crazy either. No port matching, or pinch opening, etc. I mostly just worked on the short turns and cleaning all the casting crud out of the ports, and blending everything in. It was also interesting to see the difference the undercut stem made on the exhaust side.
It was also sickening to see what a quick and dirty amateur job on these 305 heads did compared to several sets of ford heads that I have spent a LOT more time hacking on