Some M1 porting pictures and flow numbers

The first thing I noticed were how small the runners are. I usually stuff red shop rags in the ports that aren’t getting flowed to limit flow through the port being tested. The red shop rags were way too big so a visit to my rag drawer I grabbed a handful of white half socks that I save after washing if they have holes in them. A full length white sock was too big so I didn’t expect big flow numbers on a 300 plus 2.055 valve Edelbrock head. Having never touched one before in my life the numbers surprised me for an untouched manifold. This intake would make some horsepower but hopefully we can get some top lift numbers to come up some. More pictures later as it’s time to unbolt this thing and fire up the grinder. 60 plus degrees tomorrow so I’m hitting the pistol range. I need this bad.

——-Head————intake on
.100—64——————62
.200—125—————125
.300—187—————183
.350—214—————213
.400—238—————236
.450—257—————246
.500—284—————255
.550—294—————256
.600—296—————258
.650—302—————271
.700—308—————279