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SN-95 and New Edge Mustangs
The PI Headswap ---
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<blockquote data-quote="GR8WHITE" data-source="post: 3651578" data-attributes="member: 39"><p>PI head swap onto a 96-98 motor gains a ton of compression. Factory NON PI heads had an 11cc dish and the NON PI heads have a 51cc chamber. The PI heads have a smaller 42cc chamber And PI pistons were 17 cc dish. So putting 42cc PI heads on a 11cc NON PI bottom end nets a gain of about 1.22 compression. From stock 9.3 to 10.52</p><p></p><p></p><p>Flow numbers on stock 2V heads. Intake side</p><p></p><p> Valve Lift----------------NON PI -------------PI --------------SVO </p><p></p><p>.050 ----------------------25-----------------25----------------27</p><p>.100 ----------------------47-----------------51----------------54 </p><p>.150 ----------------------64-----------------76----------------81 </p><p>.200 ----------------------83-----------------102--------------106 </p><p>.250 ----------------------99-----------------124--------------131</p><p>.300----------------------114-----------------138--------------155</p><p>.350----------------------125-----------------149--------------171</p><p>.400----------------------136-----------------153--------------177</p><p>.450----------------------147-----------------155--------------184</p><p>.500----------------------156-----------------156--------------193</p><p>.550----------------------163-----------------159--------------203</p><p>.600----------------------166-----------------160--------------206</p><p></p><p></p><p>Flow numbers stock heads Exhaust side</p><p></p><p>Valve Lift----------------NON PI----------------PI---------------SVO </p><p></p><p>.050-----------------------22------------------24---------------23</p><p>.100-----------------------40------------------49---------------46 </p><p>.150-----------------------60------------------68---------------69 </p><p>.200-----------------------80------------------84---------------90 </p><p>.250-----------------------96------------------96--------------106</p><p>.300----------------------108-----------------107--------------119</p><p>.350----------------------112-----------------116--------------128</p><p>.400----------------------115-----------------123--------------134</p><p>.450----------------------116-----------------130--------------137</p><p>.500----------------------117-----------------133--------------140</p><p>.550----------------------117-----------------136--------------141</p><p>.600----------------------117-----------------138--------------143</p><p></p><p></p><p></p><p> The PI head is superior up to .500 lift where the Non PI head equals the PI head. All numbers after that for NON PI heads are pretty much academic since I have yet to see a NON PI cam with lift above .500 The other factor to consider is velocity not just pure cfm flow. The PI heads have larger cc intake and exhaust ports but still have higher velocity due to port design. The SVO heads are the best 2V heads for flow but are very costly. They are also still limited by the NON PI cam selection, so their flow #'s above .500 lift are also academic.</p><p></p><p></p><p> I have made 320-330 rwhp, depending on the dyno, with compression, cams, unported PI heads with Mod Max larger valves, Comp cams and exhaust. The potential for good NA power is there as none of this combo was unique. All of the parts were "off the shelf" items. The quest for 400rwhp now begins. :burnout:</p></blockquote><p></p>
[QUOTE="GR8WHITE, post: 3651578, member: 39"] PI head swap onto a 96-98 motor gains a ton of compression. Factory NON PI heads had an 11cc dish and the NON PI heads have a 51cc chamber. The PI heads have a smaller 42cc chamber And PI pistons were 17 cc dish. So putting 42cc PI heads on a 11cc NON PI bottom end nets a gain of about 1.22 compression. From stock 9.3 to 10.52 Flow numbers on stock 2V heads. Intake side Valve Lift----------------NON PI -------------PI --------------SVO .050 ----------------------25-----------------25----------------27 .100 ----------------------47-----------------51----------------54 .150 ----------------------64-----------------76----------------81 .200 ----------------------83-----------------102--------------106 .250 ----------------------99-----------------124--------------131 .300----------------------114-----------------138--------------155 .350----------------------125-----------------149--------------171 .400----------------------136-----------------153--------------177 .450----------------------147-----------------155--------------184 .500----------------------156-----------------156--------------193 .550----------------------163-----------------159--------------203 .600----------------------166-----------------160--------------206 Flow numbers stock heads Exhaust side Valve Lift----------------NON PI----------------PI---------------SVO .050-----------------------22------------------24---------------23 .100-----------------------40------------------49---------------46 .150-----------------------60------------------68---------------69 .200-----------------------80------------------84---------------90 .250-----------------------96------------------96--------------106 .300----------------------108-----------------107--------------119 .350----------------------112-----------------116--------------128 .400----------------------115-----------------123--------------134 .450----------------------116-----------------130--------------137 .500----------------------117-----------------133--------------140 .550----------------------117-----------------136--------------141 .600----------------------117-----------------138--------------143 The PI head is superior up to .500 lift where the Non PI head equals the PI head. All numbers after that for NON PI heads are pretty much academic since I have yet to see a NON PI cam with lift above .500 The other factor to consider is velocity not just pure cfm flow. The PI heads have larger cc intake and exhaust ports but still have higher velocity due to port design. The SVO heads are the best 2V heads for flow but are very costly. They are also still limited by the NON PI cam selection, so their flow #'s above .500 lift are also academic. I have made 320-330 rwhp, depending on the dyno, with compression, cams, unported PI heads with Mod Max larger valves, Comp cams and exhaust. The potential for good NA power is there as none of this combo was unique. All of the parts were "off the shelf" items. The quest for 400rwhp now begins. :burnout: [/QUOTE]
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