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#1
07-16-2005, 09:03 PM
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I milled into both quench pads. A little on the back, mostly by the intake valve, and much more on the spark plug side. They are 79 cc's now.
Does anyone know how to post more than one photo in one post? I have some of the porting work I could show. At .400 lift they flow 240cfm |
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#2
07-16-2005, 10:28 PM
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Was your main objective to unshroud valves or to enlarge the chamber? Any data on what it did for flow?
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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#3
07-17-2005, 06:20 AM
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A lottle more canted toward the spark plug like a "fast burn chamber" I think would be good to for mixture motion.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#4
07-17-2005, 10:04 AM
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I had these heads sitting since 1983. They had sunk valves. I lowered the floor so the margin of the valve is exposed. I opened the quench pads for more cc's and to help unshroud the valves. I hope the two angles of the quench pads aid in mixing during compression. I milled the quench pad as much as I could by the intake. I did not want to break through and spark plug location limits how much it can be opened up. The heads started out at 67 cc's, at 79cc's I have 9.9 to 1 compression on this 428.
I did not flow test them before I started, but I am happy with the flow numbers. This is the second set of heads I have ported. The next ones are my 061's to go in my 68 Firebird |
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#5
07-19-2005, 04:44 AM
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If you could relocate the spark plug so that it is aimed at the intake valve, you would have a modern chamber design!
Great job you've done. |
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#6
07-19-2005, 04:46 AM
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Sorry, meant to say pointed at the exh valve.
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