Buicks.net
classifieds | webboard


This is an interesting flow comparison for various Buick head, valve and porting combinations. I own or owned most of the heads involved and have the flow sheets. Some were before and after porting #s of the same head. All flow #s were at or converted to flow @ 10" of water. Multiply any of the #s by a 1.67 conversion factor to get the flow @ 28" of water (industry standard). I just happened to have more flowed at 10" than 28", and I had to go one way or another for comparison
              Steve Berry
Buick Intake Flow Comparison
Engine, Valve Size and Porting StatusTester and/orPorter WaterConv. Factor.100 Lift.200 Lift.300 Lift.400 Lift.500 Lift.600 Lift
401, 1.87, NoneMike Kamm10NA 32.0 66.0 94.0108.0 114.0117.0
401, 1.94, NoneSteve Magnotty / Carmen Faso28/ 1.67 35.3 71.0 98.2107.4109.6110.2
401, 1.87, Medium Mike Kamm10NA 34.0 67.095.0115.0126.0121.0
401, 1.87, ModerateGreg Gessler10NA 36.9 76.1102.2117.7126.9131.2
401, 1.94, ModerateSteveMagnotty28/ 1.67 36.5 72.5103.0120.4128.7133.5
455, 2.12 None *Charlie Evans28/ 1.67 40.6 85.0118.4135.8134.7135.8
455, 2.12, Street/ Strip Greg G. / G. Tomlenson10NA 42.4 82.7120.0 142.6146.5147.0
455, 2.12, Competition Greg Gessler10NA 42.5 87.4127.3155.0162.0158.3
525, 2.25, Stage IVMike M. (TA) / Champion28/ 1.67 45.3 88.0130.5159.2192.2216.7
* Earlier 430 heads with stage one 455 valves installed. The 430 featured larger intake ports than the 1970 and up stage one heads.
 
Buick Exhaust Flow Comparison
Engine, Valve Size and Porting StatusTester and/orPorter WaterConv. Factor.100 Lift.200 Lift.300 Lift.400 Lift.500 Lift.600 Lift
401, 1.50, NoneMike Kamm10NA 27.0 46.0 59.0 68.0 71.0 72.0
401, 1.50, NoneSteve Magnotty / Carmen Faso28/ 1.67 28.6 48.0 67.1 71.6 74.2 75.1
401, 1.50, MediumMike Kamm10NA 24.0 47.0 61.0 73.0 79.0 79.0
401, 1.50, ModerateGreg Gessler10NA 28.9 49.5 64.7 78.1 82.7 84.7
401, 1.50, ModerateSteve Magnotty28/ 1.67 31.1 55.7 75.4 84.4 89.8 91.6
455, 1.75, NoneCharlie Evans28/ 1.67 34.4 58.0 74.3 85.0 91.093.6
455, 1.75, Street/ Strip Greg G. / G. Tomlenson10NA 37.9 69.1 85.7101.1104.4106.0
455, 1.75, Competition Greg Gessler10NA 36.3 71.4 87.0103.2112.3116.8
525, 1.81, Stage IVMike M. (TA) / Champion28/ 1.67 38.7 77.1107.5132.8148.0155.6

Back to Buicks.net