Buick 401 and 455 Head Porting Chart
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 Status |
Tester and/orPorter |
Water |
Conv. Factor |
.100 Lift |
.200 Lift |
.300 Lift |
.400 Lift |
.500 Lift |
.600 Lift |
| 401, 1.87, None |
Mike Kamm |
10” |
/ 1.67 |
53.4 |
110.2 |
157.0 |
180.4 |
190.4 |
195.4 |
| 401, 1.94, None |
Steve Magnotty / Carmen Faso |
28” |
NA |
58.9 |
119.0 |
164.0 |
179.4 |
183.0 |
184.0 |
| 401, 1.87, Medium |
Mike Kamm |
10” |
/ 1.67 |
56.8 |
111.9 |
158.7 |
192.1 |
210.4 |
202.1 |
| 401, 1.87, Moderate |
Greg Gessler |
10” |
/ 1.67 |
61.6 |
7127.1 |
170.7 |
196.6 |
211.9 |
219.1 |
| 401, 1.94, Moderate |
SteveMagnotty |
28” |
NA |
61.0 |
121.0 |
172.0 |
201.4 |
215.0 |
223.0 |
| 455, 2.12 None * |
Charlie Evans |
28” |
NA |
76.1 |
142.0 |
197.7 |
226.8 |
224.9 |
226.8 |
| 455, 2.12, Street/ Strip |
Greg G. / G. Tomlenson |
10” |
/ 1.67 |
70.8 |
138.1 |
200.0 |
238.1 |
244.7 |
245.5 |
| 455, 2.12, Competition |
Greg Gessler |
10” |
/ 1.67 |
71.0 |
146.0 |
212.6 |
258.9 |
270.5 |
264.4 |
| 525, 2.25, Stage IV |
Mike M. (TA) / Champion |
28” |
NA |
75.7 |
147.0 |
218.0 |
265.8 |
321.0 |
361.9 |
| * 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 Status |
Tester and/orPorter |
Water |
Conv. Factor |
.100 Lift |
.200 Lift |
.300 Lift |
.400 Lift |
.500 Lift |
.600 Lift |
| 401, 1.50, None |
Mike Kamm |
10” |
/ 1.67 |
45.1 |
76.8 |
98.5 |
113.6 |
118.6 |
120.2 |
| 401, 1.50, None |
Steve Magnotty / Carmen Faso |
28” |
NA |
47.7 |
81.5 |
112.0 |
119.5 |
123.9 |
125.4 |
| 401, 1.50, Medium |
Mike Kamm |
10” |
/ 1.67 |
40.1 |
78.4 |
101.9 |
121.9 |
131.9 |
131.9 |
| 401, 1.50, Moderate |
Greg Gessler |
10” |
/ 1.67 |
48.3 |
82.7 |
108.0 |
130.4 |
138.1 |
141.4 |
| 401, 1.50, Moderate |
Steve Magnotty |
28” |
NA |
52.0d> |
93.0 |
126.0 |
141.0 |
150.0 |
153.0 |
| 455, 1.75, None |
Charlie Evans |
28” |
NA |
57.4 |
96.9 |
124.1 |
142.0 |
152.0 |
156.3 |
| 455, 1.75, Street/ Strip |
Greg G. / G. Tomlenson |
10” |
/ 1.67 |
63.3 |
115.4 |
143.1 |
168.8 |
174.3 |
177.0 |
| 455, 1.75, Competition |
Greg Gessler |
10” |
/ 1.67 |
60.6 |
119.2 |
145.3 |
172.3 |
187.5 |
195.1 |
| 525, 1.81, Stage IV |
Mike M. (TA) / Champion |
28” |
NA |
64.6 |
128.7 |
179.5 |
221.7 |
247.2 |
259.8 |
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For more Buick head porting charts, Click here.
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