[J.C.you]

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?

[JSuchma]

IIRC, Pete did some articles in HPP years ago listing the factory cast iron heads, with port flow and volume.

[25stevem]

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.

[J.C.you]

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.

[Half-Inch Stud]

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.

[Stan Weiss]

Originally Posted by J.C.you

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?

Yes NHRA does have a list of max port volumes. I had it at one time but cannot find it now, But almost all production heads when measured will be smaller than those numbers.

Stan

[Stan Weiss]

Originally Posted by Half-Inch Stud

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.

Mark,
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

[J.C.you]

Originally Posted by Stan Weiss

Mark,
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

I believe Lynn McCarty SS combo the floors are epoxied…..so common to raise ports and lessen the short turn as much as possible.

[Half-Inch Stud]

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 !

[Stan Weiss]

Originally Posted by Half-Inch Stud

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 !

Mark,
It is about best use of CSA. This shows where DV removed metal from. This is why David always talks about "Port Energy".

Stan

[PAUL K]

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.

[J.C.you]

Originally Posted by PAUL K

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.

Meaux has that information in his program

[PAUL K]

Originally Posted by J.C.you

Meaux has that information in his program

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.

[Half-Inch Stud]

I thought Meaux was only in the exhaust config-calc biz. Will look up the Inhale stuff.

[bankbook]

Originally Posted by J.C.you

I believe Lynn McCarty SS combo the floors are epoxied…..so common to raise ports and lessen the short turn as much as possible.

I have a set of Bob Micheals SS 6x heads from 1992 that have a lot of port/floor work including epoxy that verify's the turn comment. Work done by Heads Up in Ohio.

Will be flowing them soon. Really nice work.

[slowbird]

Originally Posted by bankbook

I have a set of Bob Micheals SS 6x heads from 1992 that have a lot of port/floor work including epoxy that verify's the turn comment. Work done by Heads Up in Ohio.

Will be flowing them soon. Really nice work.

Any pictures?

[J.C.you]

Originally Posted by bankbook

I have a set of Bob Micheals SS 6x heads from 1992 that have a lot of port/floor work including epoxy that verify's the turn comment. Work done by Heads Up in Ohio.

Will be flowing them soon. Really nice work.

Off topic but….
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

[25stevem]

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”.

[Half-Inch Stud]

@ Stan; the Induction Optimization Program IOP seems interesting.

[68azbird]

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