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#1
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What do 587 smallblock heads flow?
Trying to remember where I stashed my chart showing what '74 "587" smallblock stock heads flow vs. pocket porting/bowl blend and on up for the Desktop Dyno and Virtual Engine program files. Can't find 'em anywhere and want to dial in which intake to put on the ol' 360...anyone? 440cj
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#2
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Tell me the rest of the combo and intended use and I'll tell ya what intake to use if you give me a choice of intakes.
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#3
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I hope this looks OK, as it is wraping on the screen, but I pasted some numbers (from my Excell spread sheet) and magazing referance articles on the 587 Heads:
SMALL BLOCK WEDGE CYLINDER HEADS CORRECTED TO 28" WATER. A. B. C. D. E. F. G. NOS NOS BIG VALVES HOGGED OUT Test D with Test E with Fully ported STOCK STOCK stk/mod port stk valves backcut valve 1.94" intake 587 308 587 587 587 587 587 1.88/1.60 1.88/1.60 2.02/1.72 1.88/1.60 1.88/1.72 1.94/1.72 2.02/1.72 Intake Lift 0.150 90.88 88.61 110.20 94.29 118.15 117.01 110.20 0.200 123.83 119.29 142.01 127.24 154.50 155.64 148.82 0.250 156.78 146.55 165.86 163.59 181.77 184.04 182.90 0.300 181.77 170.41 184.04 193.13 203.35 206.76 210.17 0.350 198.81 187.45 197.67 211.31 216.99 226.07 231.76 0.400 205.63 196.54 206.76 222.67 229.48 240.84 249.93 0.450 212.44 204.49 214.71 234.03 237.44 253.34 266.97 0.500 213.58 209.03 211.31 241.98 246.52 261.29 280.61 0.550 211.31 205.63 209.03 252.20 251.07 261.29 277.20 0.600 206.76 203.35 207.90 254.48 248.80 261.29 270.38 AVERAGE 180.18 173.13 184.95 199.49 208.81 216.76 222.89 AVE TO 0.500 172.96 165.30 179.07 186.03 198.53 205.63 210.17 Exhaust Lift 0.150 68.16 71.57 72.71 68.16 85.20 85.20 88.61 0.200 88.61 94.29 96.56 88.61 105.65 105.65 111.33 0.250 114.74 113.61 112.47 105.65 121.56 121.56 134.05 0.300 119.29 126.10 128.37 118.15 136.33 136.33 153.37 0.350 126.10 136.33 143.14 126.10 151.10 151.10 168.14 0.400 131.78 142.01 157.91 134.05 164.73 164.73 174.95 0.450 136.33 145.41 168.14 139.73 172.68 172.68 176.09 0.500 137.46 146.55 172.68 144.28 174.95 174.95 178.36 0.550 138.60 146.55 174.95 146.55 177.22 177.22 179.50 0.600 139.73 146.55 177.22 151.10 179.50 179.50 181.77 AVERAGE 120.08 126.90 140.42 122.24 146.89 146.89 154.62 AVE TO 0.500 115.31 121.98 131.50 115.59 139.02 139.02 148.11 E/I PERCENT 66.65% 73.29% 75.92% 61.28% 70.35% 67.77% 69.37% TO 0.500 66.67% 73.80% 73.43% 62.14% 70.03% 67.61% 70.47% A. Chrysler Power NOV 1991 - 587 small block head stock 1.88/1.60 valves and ports. B. Chrysler Power NOV 1991 - 308 small block head stock 1.88/1.60 valves and ports. C. Chrysler Power NOV 1991 - 587 small block head BIG 2.02/1.72 valves and stock intake port, Hogged out exhaust port. D. Chrysler Power NOV 1991 - 587 small block head stock 1.88/1.60 valves and Hogged out intake and exhaust ports. E. Chrysler Power NOV 1991 - 587 small block head, Hogged out intake and exhaust ports, back cut 1.88" intake valve 1.72" Tulip exhaust. F. Chrysler Power NOV 1991 - 587 small block head, Hogged out intake and exhaust ports, 1.94" nail head chevy intake valve, 1.72" Tulip exhaust. |
#4
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Never mind the chevy int. valve, whats up with this...
1.72 exhaust valve?????????? |
#5
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This was a very through article on what-ifs in porting the heads.
The large 1.72" valve was a cutdown big block chevy "tulip" backed valve to see just how much flow they could get from the exhaust. When they actually built the heads they used a tulip backed 1.65" exhaust valve simular to the Hughes Engines cylinder heads. Some other things they found was that filling the intake port floor (between 3/8" and 1/2") increased port velocity without reducing port flow, basically showing that there is no need to remove material from the port floor of the intake port. The numbers are somewhat imformative, but if your interested, you need to read the article so see what was done and which mods are really not normally done like the 1.72" exhaust valve and completly removing the pushrod hump in the intake or filling the port floor. These type of modifications would be too expensive for most usere except racers that are limited to using production heads. |
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