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#1
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Port volumes
Never seen a master list of port volumes for the Pontiac iron heads. Is that info out there? I suppose Nhra may have that info in some form?
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
#2
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IIRC, Pete did some articles in HPP years ago listing the factory cast iron heads, with port flow and volume.
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#3
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1967 to 74 D port heads where 154 CCs.
1975 to 1977 D ports where on average much closer to 155 and some times a tad over. These would be the 5 series and 6 series heads. The 1969 722 RA4 heads and the 1970 614 casting RA4 heads where some 184 CCs. The 1971 and 1972 455HO heads where 172 CCs 1973/1974 SD 455 heads where 186 CCs or a tad more depending on the core shift they may have. NHRA list the maximum that they allow within there rules, which is always greater then stock.
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I do stuff for reasons. |
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#4
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One reason I asked is obviously the deeper chambers heads would have less port volumes than the shallow castings.
Also the 6x series had a more rectangular short turn area than the earlier castings.
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
#5
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Vizard has been cranking out interesting videos lately. 1 video shows how he makes biggest power with greatly-reduced Port volume: epoxy-fill the floor about 1/4" to 3/8" thick.
Pro-ceiling flow, widen the ceiling if ya can, against floor flow due to dominant flow along the Bowl+CYL backwall. Floor flow only causing misery. I forget if sbc or BBC, but fairly irrelevant, and goes to show either JB-Weld or another epoxy, and how to drill the runner floor and side to lock the plastic in. I was impressed. Shows dyno results compared to the known highest hp head and beats it at low and high rpm by a wee bit, and a sag in mid-range by a wee bit. Overall insightful. I'm not about to do that to Ram Air IIs, but the 48s ( or find a set of 13s for example) would generate a good dataset. Last edited by Half-Inch Stud; 12-21-2022 at 09:49 AM. |
#6
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Quote:
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#7
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Quote:
It was a BBC. But this has also been done in Ford Cleveland heads for many many years. This is a Super Stock Hemi head. The rules say you can port them, but they still have to have the same port volume. In this case they brazed up the bottom of the port. Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm Last edited by Stan Weiss; 12-21-2022 at 01:21 PM. |
The Following User Says Thank You to Stan Weiss For This Useful Post: | ||
#8
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Quote:
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
#9
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Vizard was definite and clear to say reduced volume, CSA to make the same broad TQ, and HP than an excellent BBC head.
A new life for 301 heads! Reduced CSA for the Win ! |
#10
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Quote:
It is about best use of CSA. This shows where DV removed metal from. This is why David always talks about "Port Energy". Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
The Following User Says Thank You to Stan Weiss For This Useful Post: | ||
#11
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Smallest port with the highest CFM wins if the port is large enough to feed the engine. If the engine is port restricted the larger port with the most CFM usually wins.
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The Following User Says Thank You to PAUL K For This Useful Post: | ||
#12
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Meaux has that information in his program
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
#13
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I have it in my head.... Meaux's system is probably better as long as the lights stay on and there isn't a power surge.
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#14
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I thought Meaux was only in the exhaust config-calc biz. Will look up the Inhale stuff.
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#15
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Will be flowing them soon. Really nice work.
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DOC'S TA Turbo 535, CV 1 heads. Built by Cerralli Competition Engines Tenth Anniversary (Van Nuys) restored. Tenth Anniversary Barn Find (Norwood) Both 4 speeds! |
#16
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Any pictures?
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#17
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If someone didn’t have anything else to do, I believe one could graft two iron heads together, raise the ports and make a killer iron cheater head. Borrowed this pic SS sd head
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds Last edited by J.C.you; 12-22-2022 at 02:53 PM. |
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#18
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It has been done by at least one AMC racer as I recall, but a holy crap it must be a ton of work to but it mildly, and likely took many attempts!
If I recall right a fellow named Hemmy Adkin running super stock back in 99 was running 9.50s with a non stacked and welded, but heavily port heads and making according to him 718 Hp from 277 cfm of intake flow and 257 out the exh both at .700”.
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I do stuff for reasons. |
#19
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@ Stan; the Induction Optimization Program IOP seems interesting.
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#20
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So how much power did these heads make on a 406 cubic inch pontiac?
Intake flow @28 h2o .100 = 75 .200 = 144 .300 = 189 .400 = 205 .500 = 209 .600 = 209 Exhaust flow .100 = 53 .200 = 107 .300 = 147 .400 = 169 .500 = 167 .600 = 182 162 cc intake port volume
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It is easier to fool a man than it is to convince he has been fooled |
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