Leyland P76 Owners 2004

Technical problem

[215V8] Buick 300 porting results

by Dan Jones of the 215V8 Yahoo group

16th Feb, 2006

I finally got around to picking up the Buick 300 heads for my Rover/Buick stroker project.
Flow numbers are shown below, along flow numbers for an unported Buick 300 head with fresh valve job.
For comparison's sake, I've also attached some flow numbers for small block Ford heads at the end of this post.
Valve Buick 300 Exh/Int Buick 300
Lift 1964 ratio 1964
(inch) aluminum (%) aluminum
ported unported
Int Exh Int Exh
1.775" 1.5" 1.625" 1.312"
0.100 66 47 71.2
0.150 99 82 82.8
0.200 129 104 80.6 105 96
0.250 155 119 76.8
0.300 174 130 74.7 135 108
0.350 187 139 74.3
0.400 191 146 76.4 142 115
0.450 194 150 77.3
0.500 196 152 77.6 149 115
0.550 200 153 76.5
0.600 200 153 76.5 154 116
Heads were ported by Jon Carls:
JDC Engineering
711 Walnut
Minonk, IL 61760
309 275-2761 (cell)
Flow numbers were taken on a Superflow bench at 28" H2O with a clayed intake radius but no exhaust pipe and a 4" diameter tube to simulate the cylinder wall.
6000 Series Ferrea Buick V6 Stage 1 valves were used.
Intake valves are part number F6238 (1.775" head diameter, 11/32" stem, 4.735" long with a 0.271" tip).
Exhausts are part number F6237 (1.5" head diameter, 11/32" stem, 4.735" long with a 0.254" tip).
Intake head shape is a 10 degree Super Flo.
Exhaust is a 29 degree tulip.
Ferrea's 6000 Series valves are competition parts suitable for solid roller cams.
The larger valves required larger seats, p/n 30903 for the intake and p/n 30647 for the exhaust.
I'll post pictures of the heads later with some comparison shots next to a Rover head and an unported Buick 300 head. I thought the valve OD would need to be reduced slightly but the larger valves just barely fit.
I gave Jon a junk head to experiment on and he said he actually pulled better numbers on the test head but wasn't comfortable going any farther on the good heads.
I can see spots where he intentionally went through the aluminum into the water jacket on the test heads to see what the wall thickness was.
Jon checked the swirl pattern by injecting paint into the airstream.
He said the swirl filled the entire chamber, unlike most heads which localize in a particular spot.
I'm pleased with the results.
The exhaust to intake flow ratio is good and the low and mid-lift numbers are excellent.
Pretty good for such a small valve head and should support my HP goals.
By way of comparison with small block Ford Windsor heads, these heads flow on par with the smaller port street type aftermarket heads (Ford GT40, Edelbrock Performer, World Windsor Jr., etc.).
Dan Jones
Valve Ford 5.0L Ford GT-40 Ford GT40X
Lift HO E7TE
(inch) cast iron cast iron aluminum
unported unported unported
Int Exh Int Exh Int Exh
1.78" 1.45" 1.84" 1.54" 1.94" 1.54"
0.100 54 47 54.6 53.1
0.200 92 78 107 94 107.8 110.2
0.300 130 95 157 119 159.5 144.7
0.400 141 102 183 128 197.2 150.3
0.500 155 106 192 128 217.4 150.4
0.600 158 105 196 129 227.8 149.4
Super Ford MM&FF
Sept. 1991 Jan. 1998
Last updated
Feb, 2005
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