[blykins]

Well, since we're doing a comparison....

Robert's heads (from Joe Craine)

Lift Intake Exhaust

.100 70.00 52
.200 147.56 109.68
.300 217.62 166.84
.400 280.22 217.06
.450 303.05 230.02
.500 319.98 238.44
.550 329.79 242.88
.600 332.46 245.87, 262.41 with pipe
.650 336.92
.700 341.37
.750 345.83 245.87

Barry's heads (from Joe Craine)

Lift Intake Exhaust

.100 66.24 58.49
.200 140.01 103.99
.300 204.8 160.36
.400 270.08 199.24
.450 294.13 208.96
.500 309.73 215.44
.550 319.98 221.92
.600 329.79 226.78
.650 338.7 227.43
.700 347.61 228.72
.750 slight back up 230.02, 254 with pipe

Now granted, a 187cc port vs a 208cc port is a little different, but so are the flow numbers. A 48x inch motor is going to suck hard on anything you bolt on, so charge velocity isn't as critical.

I also don't believe the Pond heads will fit a smaller bore size, so we're limited to using these heads on the "big boys". Barry's heads should be 390 compatible.

At some future point, I wouldn't mind trying a set of your heads Barry if you would allow me to. I feel pretty confident in the Pond heads with these numbers though, especially at the low numbers and exhaust numbers. Proof will be in the pudding.