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#1
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elderbrock vs 340
what kind of power difference would i get from elderbrock heads vs. 340 X heads on a 360
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#2
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The Edelbrock heads flow more air than stock heads. More air, more power.
Does anybody out there have stock airflow numbers for the "X" heads? A good visual comparision can be made with a computer program using these numbers. Edelbrock ported out a set of 915 heads to get 392 HP. There heads produced 417HP. Hope this helps. |
#3
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915 Head Flow
I had a set of 915 heads flowed @ 28" on a Superflow bench years ago. I think peak flow was at 198 cfm at .550" lift, and I think the exhaust was only around 130 cfm. I didn't flow my X heads, but I would think that they would be equal to the 915 or slightly better. The 587 heads flowed better on the exhaust by about 10 cfm due to the smog bump on the bottom of the exhaust port. I had the 587 heads rebuilt with SI valves, three angle valve job with a bowl hog cut under the valves. I got around 215 cfm on the intakes and 154 cfm on the exhaust. This is without any porting.
The Edelbrock heads flow around 250cfm and 175cfm. You'd be hard pressed to get a set of X heads to flow this much. McCandless built some 360 engines with the RPM cam and intake packages. He made 358 HP with cast iron heads, and 399 HP with the Edelbrock heads. This wasn't on the same engine, but with the same cam and intake, etc. So maybe around 40HP gain with the Edelebrock heads is likely. |
#4
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Its not totally on subject, but I was at my local track there was a guy from Maine with a Duster 340 Mcandless W-2, SS car with rollbar 4 speed, 9.80 that a bad ass car man it was impressive.
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#5
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Head Flow Data
Here is the flow data I collected on some heads that I had flowed. Hopefully the columns line up in some reasonable order.
Head ID /Valve Lift> .200 .300 .400 .500 .600 .700 360 "J"-#587 w/1.88I 110 165 190 190 185 1.60E 90 117 135 140 141.5 360 "U"-#915 w/2.02 Int. 118 166 190 196 193 w/ Prod. 1.60 Exh. 85 116 124 129 133 w/ MP 1.60 Exh. 97 119 126 129 131 W-2 w/Prod. 2.02I 111.5 160 204 231 228 w/ MP 1.60E 95 129 138 140 141 W-5 w/Chev. 2.06I 127 181 221 235 245 253 w/Prod. 1.60E 83 117 138 147 152 171 Edelbrock RPM 2.02 Int. 126 179 224 239 242 Edelbrock RPM 1.60 Exh. 110 139 158 170 176 360 "J"-#587 w/2.02 SI Int 127 181 213 215 SI 1.60 Exh. (70/45/30 Vlv <) 97 128 143 147 The Edelbrock head data is from their website published data. The W5 heads were ground for a 2.08" intake, so we used a BB Shivy 2.06 intake for testing as the 2.02 Mopar valve sunk in too much. The W2 heads did not have the seats ground, but had the top and bottom cuts. Low lift flows might be off as a result. |
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