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#21
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Here is a note about the virtues of a solid roller.
Intake RX lobe 4305 261 @ .050 179 @ .200 .431 lobe lift. Exhaust NC lobe 4145 262 @ .050 183 @ .200 .421 lobe lift. Same centerlines as post 19. Valve lash .020 , same 1.6 rockers. Superior output from 1500 RPM (far left) to 6200 RPM. Attached images, the lighter colors are the solid roller. Green is TQ. The other is net valve lift curves, notice the solid roller has less overlap. Red traces are the intakes. Last edited by pastry_chef; 08-04-2019 at 12:57 PM. |
#22
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#23
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Need to watch the lobe centerlines as well but if the exhaust duration is reduced too far it hurts top end power.
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#24
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The heads will thrive on high valve lift.
0.592" lift is not a lot knowing those heads are well ported for the claimed 360 cfm and that is probably at 0.700" lift. Many years ago when I bought my set of High Port castings they were claiming the heads AT THAT TIME had flow numbers starting at 340 cfm not ported. In reality they were closer to 330 at .700" lift with a SCE 128103 gasket. That gasket has a port opening about 2.320" tall despite what the SCE catalog states. We ported my HP castings to 403 or 415 cfm depending on the bench, good numbers 14 years ago. Supporting 910 hp. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#25
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Thanks in advance |
#26
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Thanks in advance |
#27
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PM sent.
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#28
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Ported high ports? |
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