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Re: mid 70's NOS Mullen small block race heads [Re: LSP] #2743398
02/16/20 12:01 AM
02/16/20 12:01 AM
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I went to an SAE Motorsports Conference in Dearborn in 1998. I met Bob Mullen there and he told me he made a set of D9 Hemi heads, but Sox & Martin weren't interested. He said they were just waiting for the weight breaks to change. I've never heard anything about D9 Hemi heads anywhere.

I have that old A&W 340 manual from when I was in high school. I converted the 3"H2O numbers to the 28"H2O numbers and got within 1 cfm of the bare 915 heads I had flowed locally.


Floyd Lippencott IV
Re: mid 70's NOS Mullen small block race heads [Re: LSP] #2743464
02/16/20 09:48 AM
02/16/20 09:48 AM
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Charlie H Offline
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Originally Posted by LSP
Charlie,

Ever wet sleeve or furnace braze sleeves in any 340 blocks when at Mullen's?


LSP,
No, I don't recall working on any blocks. I'm not sure a Bridgeport was big enough to sleeve a block. Lots of head work: guides, seats, decks, Holley carb or two, intake manifolds, and even recut Hemi chambers that Jim Razor welded up after some engine failures with a big form cutter that Bob had from his days at Chrysler. Bob's father came to work there somewhere along the time I was there. He was probably in his 80's at the time and had some great stories from machining huge steel mill rolls. It was a fun place to work for a while, when I was between aerospace jobs. But I needed to move on. Bob just couldn't pay much and I was starting to look elsewhere. I ended up at Rockwell working structural machining in El Segundo on the B-1A and Space Shuttle.

Re: mid 70's NOS Mullen small block race heads [Re: Charlie H] #2743504
02/16/20 11:43 AM
02/16/20 11:43 AM
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I was only there once - my Dad ran Modified Eliminator back in the day, and we took his 426 Hemi heads in one morning back in 78 I think it was for a valve job. I was only 14 at the time, but Jim let me face the valves after showing me how, was such a thrill at the time. I asked about the 340 block, because my Dad dropped by the shop later, and saw that it had no cylinders in it, was just one big oblong hole in each bank, Jim had said that it was one of Glidden's blocks.

Re: mid 70's NOS Mullen small block race heads [Re: RMCHRGR] #2743851
02/17/20 08:36 AM
02/17/20 08:36 AM
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Originally Posted by RMCHRGR
I was asking whether "Direct Connection" (not MP) back in the '70s was offering a ported iron head, I don't have any older DC catalogs around.

If Mopar did offer something like that, I imagine they likely would have been done by Mullen. The W2 came out around the same time so it kind of does not really make sense. Maybe they were exploring stuff with factory heads? Dunno.

I have a set of the #269 heads. These were the MP OTC '308' heads without the smog holes. Same a s a regular 308 otherwise with 1.88 valves.

As mentioned, there were a few levels of ported iron heads they offered. I believe that was in the '80s though, not the '70s.



I believe you are thinking of "576" heads. DC/Mopar Perf. had a few versions of them over the years - "stock", assembled/ported to different levels as well as a T/A version.

From what I recall reading, Mullin was experimenting with OEM heads, including T/A, and the radical mods finally lead to just casting a whole new head, the W-2.

I'm guessing that Mopar had a lot of OEM stuff avaialable when the W-2 came out. There was a major cost factor in changing to W-2's, so the OEM based heads still filled a niche.

Re: mid 70's NOS Mullen small block race heads [Re: efisixpack] #2868262
01/02/21 09:30 PM
01/02/21 09:30 PM
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Greetings did u ever sale these ???
I recently obtained a set and are having them rebuilt with modern lite weight valves etc. !!!
I'm building a 66 Valiant for SS racing and these are some very nice oem castings .

Re: mid 70's NOS Mullen small block race heads [Re: RMCHRGR] #2868267
01/02/21 09:39 PM
01/02/21 09:39 PM
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I have a 1975 Direct Connection catalog and these heads [ Direct Connection / Mullen ] heads are offered in the book !!
1976 the W2 was released so these were the last Oem [Mullin] offerings and that in itself makes these very unique.

Re: mid 70's NOS Mullen small block race heads [Re: 543Dakota] #2869497
01/05/21 09:10 PM
01/05/21 09:10 PM
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Originally Posted by 543Dakota


I have a 1975 Direct Connection catalog and these heads [ Direct Connection / Mullen ] heads are offered in the book !!
1976 the W2 was released so these were the last Oem [Mullin] offerings and that in itself makes these very unique.


I have reference to W-2 heads as early as May ‘73. They might not have been released for sale to general public. But seems like they were ready and waiting.

By March 29, 1975 Mullen is testing “W-3” heads. That was after a “W-2 1/2”. Haven’t found a reference to W-4... yet.

Could the ported 360 be a class deal requiring production castings? Or/and a more economical head using production valve gear to sell in DC catalog to hot street and bracket racers?

6E7CEF97-1FF6-4FD9-AC9F-4344487CB91D.jpeg
Last edited by autoxcuda; 01/05/21 09:18 PM.
Re: mid 70's NOS Mullen small block race heads [Re: 543Dakota] #2874890
01/15/21 08:31 PM
01/15/21 08:31 PM
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Originally Posted by 543Dakota


I have a 1975 Direct Connection catalog and these heads [ Direct Connection / Mullen ] heads are offered in the book !!
1976 the W2 was released so these were the last Oem [Mullin] offerings and that in itself makes these very unique.


By the DC catalogs it looks like these Mullen 360 heads were offered until 1976


A220999D-34A2-4F0F-9316-6F33CF77FD56.jpeg
Last edited by autoxcuda; 01/15/21 08:32 PM.
Re: mid 70's NOS Mullen small block race heads [Re: BradH] #2977219
10/22/21 12:24 PM
10/22/21 12:24 PM
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Charlie H Offline
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Originally Posted by BradH
Originally Posted by 340_Dart
Have one flowed on a bench, we might all be amazed!

All the Mullen airflow work done at 3" H20"... and now lots of head specialists even question the validity of testing at 28" since it's often way lower than what the engine really generates for pressure. Makes my lowly SF-110 10" H20 standard look hi-tech compared to the old Mullen-era tests.


I had some long discussions with Bob on this topic. While there will be differences in the measured results using low ∆P, the benefits of good port work from an accurate flow bench are likely more important than what ∆P is used. Bob's work led the industry when he was using 2 or 3 in/H2O and everyone was running many times that. Bob was a mechanical engineer and highly experienced in using flow benches that were of very high ∆P, much higher than the typical Superflow. I saw test data reports he had from his days at White Diesel, Ford and Chrysler. There's a good reason for going with low ∆P. You don't need soundproof rooms and hearing protection to work on the port while it's flowing. During port development, a technician needs to be able to use probes. High noise hinders concentration and work. With low ∆P, it's not a question of accuracy, but rather whether it is representative of the actual operating conditions. Accuracy is the fidelity of the bench to measure changes and be repeatable. While those early Superflow benches had higher ∆P, they had less ability to measure changes as accurately and repeatably.

The question of whether Bob's bench was representative to real world conditions is exhibited in his succeses at the time, IMO. You can also look at aerodynamic testing. Aero engineers still use subscale test models and low flow rates for a lot of data. My brother is a windtunnel engineer at NASA Langley. And yes, there is a use for high speed tunnel data, but a large portion of data is gathered in low speed testing.

Re: mid 70's NOS Mullen small block race heads [Re: Charlie H] #2980221
10/31/21 12:54 PM
10/31/21 12:54 PM
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Some cool Mullen flow charts… at 3”

2045E552-0E14-4025-8E47-743697031888.jpeg
Re: mid 70's NOS Mullen small block race heads [Re: autoxcuda] #2980273
10/31/21 03:30 PM
10/31/21 03:30 PM
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I remember converting the flow Bob Mullen had at 3 inches of H2O on a stock 340 head vs. what one of mine flowed at 28 inches on a SF400. It was within one CFM of the same numbers after conversion. Different bench and different head. I think it's easier to find small gains with higher test pressures.


Floyd Lippencott IV
Re: mid 70's NOS Mullen small block race heads [Re: mr_340] #3008429
01/24/22 08:36 AM
01/24/22 08:36 AM
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Wonderful subject and Bob Mullen is a god of Mopar lol.

This whole issue of flow is quite interesting indeed.
David Vizard has used very basic methods for port improvement.
Low Flow is very handy in port work but the consensus seem to like 28 inches.

We are talking 50 years ago with factory cast hipo heads ‘of the day’.
Now we have a head for every occasion and mostly aluminium.

I nearly had the ‘deal of the century’ back in 2005.
A good friend in LA took me to meet Hemi George in Sun Valley.
I was on the hunt for a 426 hemi and he had some for sale.
They were a bit pricey for me so he showed me ‘a builder 426H’.

It was a Bob Mullen experimental hemi in pieces.
George said he has no idea what it’s worth, so I offered $15,000?

He said he would think about it and said “that was the price he wanted too”...

He then decided to build it himself.

It sold for $35,000 oh well, I was very close that time DOH...

Last edited by Gtxxjon; 01/24/22 08:38 AM.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...
Re: mid 70's NOS Mullen small block race heads [Re: Gtxxjon] #3008512
01/24/22 01:51 PM
01/24/22 01:51 PM
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I acquired this pair of T/A castings. The rocker pedestals are milled off. They look similar to a Mullen head. Any ides?
Doug

20160124_162709.jpg20170128_104521.jpg20170128_104636.jpg
Last edited by dvw; 01/24/22 01:56 PM.
Re: mid 70's NOS Mullen small block race heads [Re: dvw] #3008513
01/24/22 01:54 PM
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A few more pics.
Doug

20170128_104805.jpg20170128_104705.jpg20170128_104727.jpg
Re: mid 70's NOS Mullen small block race heads [Re: dvw] #3008600
01/24/22 06:53 PM
01/24/22 06:53 PM
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Originally Posted by dvw
I acquired this pair of T/A castings. The rocker pedestals are milled off. They look similar to a Mullen head. Any ides?
Doug

Neat stuff dvw, I'm into all this day 2 stuff and am always looking for something similar to put on my day 2 69 swinger. Hard to find for reasonable prices anymore tho.

Re: mid 70's NOS Mullen small block race heads [Re: greendart408] #3175267
09/14/23 10:06 PM
09/14/23 10:06 PM
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the boonies
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I used to live down the streets in Torrance CA back in the mid 80s right down the street from Stupid Shops. I mean super shops
Well right across the street from super shops was a hot rod shop called The Service Center. It was run by an old crotchety hot rodder who pretty much always had an attitude all the time. He was like the soup Nazi except for hot rod parts When I was looking through the shelves one day I saw a pair of these ported polished TA heads that I just needed to have. the price tag on them was $400. I made the mistake of asking him how much he wanted for him and he replied “what’s the tag say?” I said “says 400 will you take (something less)?” He goes into full attitude mode and says “those aren’t ordinary 340 heads. Those are special and worth every bit of $400. get the hell out of my shop and don’t come back. I know what the hell I have and I know what they’re worth. Take your business somewhereelse. Good luck finding a set of heads like that“

I totally felt like [censored]. he was actually kicking me out of his shop. He meant it. Before I left I turned and apologized as best I could andfeig ed ignorance and pleaded with him to sell me those heads and he finally said OK.

Soon afterwards I was thumbing through that book titled “how to build a small block Mopar“ and I saw that section about Bob Mullen where it talked about how he was a major designer of the 340 TA heads and how he was the guru as far as port and polish on those for maximum performance. The article also said something about how we had a shop down in Carson California I believe. Either that or somebody told me that he had a shop down in Carson. I can’t remember. But found he had a shop so I made an appointment to bring the heads down there to have some Machine work done on them. I showed him the heads and said I wanted him to touch up the porting and polishing and flow test them and do a valve job. He gave me a quote on the machine work. then he said as for touching up the porting and polishing he would not do that and he also said.hesnot gonna flow testing either. When I asked him why he said because I’ve already done that. These were heads he had ported and polished and he said they flow as good as you can get so i don’t have to waste any money on touch ups or flow tests.

I was tickled pink. He did the machine work and I put them on my 340 and have been a happy camper ever since. Fact is they’re still on my car today. I did have to port match the intake to the heads and cut down the intake so it would bolt up tothe heads. The intake would otherwise sit too high bc the heads had been milled down to get the 63cc combustion chambers. If I can find some pictures of the porting i will post them but it was pretty radical. The intake ports were cut so large that it actually broke through to the threaded valve cover screw holes that go between the two intake ports that are next to each other. I had to install studs and Loctite them in to prevent any leaks. I know none of the pictures shown in the post above have that feature so if I can find those pictures I’ll post them up. Here’s what they look like last time I adjusted my valves

IMG_4768.jpegIMG_4769.jpeg
Last edited by aarcuda; 09/14/23 10:25 PM.

It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
Re: mid 70's NOS Mullen small block race heads [Re: aarcuda] #3175270
09/14/23 10:55 PM
09/14/23 10:55 PM
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Found these pics.

IMG_4776.jpegIMG_4779.jpegIMG_4783.jpegIMG_4782.jpeg

It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
Re: mid 70's NOS Mullen small block race heads [Re: aarcuda] #3175271
09/14/23 10:57 PM
09/14/23 10:57 PM
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And these

IMG_4777.jpegIMG_4780.jpegIMG_4778.jpegIMG_4781.jpeg

It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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