Author Topic: Goofing off with some CJ heads...  (Read 2914 times)

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blykins

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Goofing off with some CJ heads...
« on: June 22, 2018, 08:25:42 PM »


In case you've ever wanted to know what a factory CJ head flows with a 5/16" stem, 2.080" intake valve and a 7mm stem, 1.650" exhaust valve....well, here you go:

.100 76  67
.200  138  115
.300  204  140
.400  235  157
.500  248  170
.600  250  180 
.700  252  189

4.125" bore, no pipe, clay inlet.   No bowl work, no porting, no nothing.  Just fun with a flow bench.
Brent Lykins
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Joey120373

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Re: Goofing off with some CJ heads...
« Reply #1 on: June 22, 2018, 08:51:21 PM »
Thanks for sharing.

Heo

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Re: Goofing off with some CJ heads...
« Reply #2 on: June 23, 2018, 06:47:38 AM »
Is it with the stock 30 deg seats on intake?

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blykins

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Re: Goofing off with some CJ heads...
« Reply #3 on: June 23, 2018, 07:00:56 AM »
No sir, 50° on the intake, 45° on the exhaust.
Brent Lykins
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blykins

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Re: Goofing off with some CJ heads...
« Reply #4 on: June 23, 2018, 07:17:37 AM »
Ok, here are some comparative flow numbers from one of the previous sets of CJ heads that I used:

*Stock head, factory valves, no work.

.100 64  52
.200 124  87
.300 182  118
.400 211  144
.500 224  164
.600 231  174
.700 236  179

*Stock head, Ferrea 3/8" valves, no work, 45° intake/exhaust seats:

.100  80  64
.200  139  100
.300  195  133
.400  230  162
.500  246  181
.600  253  188

At first glance, I thought I had wasted an hour or so of labor, but if you look closely, we did pick up a few cfm on the mid-lift numbers in comparison to the 3/8" Ferreas. 

To be honest, I was hoping for a little more, but the main goal of this R&D was to get some valves that were extremely light for an upcoming 390 build.  FWIW, the intake valve is titanium and weighs 86g.  The exhaust valve is stainless and sits at 88g.
Brent Lykins
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Heo

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Re: Goofing off with some CJ heads...
« Reply #5 on: June 23, 2018, 07:18:06 AM »
OK,  checked up Edelbrocks own flownumbers  they are
close to each others.
I have never seen a Cobrajet head live,The saying around
here was that a early head like a C4-G or such was like a
CJ heads with smaller valve...any Truth in that?

-25 Chrysler hotrod 292 y- block,toploader,Ford axles
-29 Ford roadster
-30 Ford tudor
-31 Ford coupe
-37 Ford tudor, flathead
-49 Ford Anglia
-64 Ford Galaxie 500 p code
-54 AJS 18S 500 cc

blykins

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Re: Goofing off with some CJ heads...
« Reply #6 on: June 23, 2018, 07:26:32 AM »
OK,  checked up Edelbrocks own flownumbers  they are
close to each others.
I have never seen a Cobrajet head live,The saying around
here was that a early head like a C4-G or such was like a
CJ heads with smaller valve...any Truth in that?

Yes sir, the C4 head is often referred to as the "poor man's CJ head". 
Brent Lykins
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Heo

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Re: Goofing off with some CJ heads...
« Reply #7 on: June 23, 2018, 07:36:30 AM »
OK thats what i heard, but you hear a lot most of it
not true . But i guess this is one of those times it actualy is
I see you gain 10-20 cfm just with 45 deg seats
« Last Edit: June 23, 2018, 07:39:45 AM by Heo »

-25 Chrysler hotrod 292 y- block,toploader,Ford axles
-29 Ford roadster
-30 Ford tudor
-31 Ford coupe
-37 Ford tudor, flathead
-49 Ford Anglia
-64 Ford Galaxie 500 p code
-54 AJS 18S 500 cc

blykins

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Re: Goofing off with some CJ heads...
« Reply #8 on: June 23, 2018, 07:39:22 AM »
In a table that's easier to read without scrolling up and down...

Intake Flow

         Factory      3/8" Ferrea     5/16"-7mm

.1       64                80                  76
.2      124              139                138
.3      182              195                204
.4      211              230                235
.5      224              246                248
.6      231              253                250
.7      236                                   252

Exhaust Flow

.1      52               64                  67
.2      87              100                115
.3     118             133                140
.4     144             162                157
.5     164             181                170
.6     174             188                180
.7     179                                  189
Brent Lykins
Lykins Motorsports
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Heo

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Re: Goofing off with some CJ heads...
« Reply #9 on: June 23, 2018, 07:42:27 AM »
Thank you sir.
Interesting

-25 Chrysler hotrod 292 y- block,toploader,Ford axles
-29 Ford roadster
-30 Ford tudor
-31 Ford coupe
-37 Ford tudor, flathead
-49 Ford Anglia
-64 Ford Galaxie 500 p code
-54 AJS 18S 500 cc

scott foxwell

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Re: Goofing off with some CJ heads...
« Reply #10 on: June 23, 2018, 08:54:00 AM »
Would have been interesting to do the small stem valves with a good 45* v/j.

KMcCullah

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Re: Goofing off with some CJ heads...
« Reply #11 on: June 23, 2018, 09:30:31 AM »
OK,  checked up Edelbrocks own flownumbers  they are
close to each others.
I have never seen a Cobrajet head live,The saying around
here was that a early head like a C4-G or such was like a
CJ heads with smaller valve...any Truth in that?

Several years ago I sent Les Schmader a pair of C4-G castings with 2.15/1.65 valves. He did ok work for the money. They won a few races on my junky 390.

http://fepower.net/simplemachinesforum/index.php?topic=620.15
Kevin McCullah

preaction

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Re: Goofing off with some CJ heads...
« Reply #12 on: June 23, 2018, 01:20:23 PM »
Brent, did you get the finish on these heads from a wheelabrator machine ?

fryedaddy

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Re: Goofing off with some CJ heads...
« Reply #13 on: June 23, 2018, 01:25:29 PM »
What is the highest flow numbers ever heard of with highly modified cj heads

blykins

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Re: Goofing off with some CJ heads...
« Reply #14 on: June 23, 2018, 01:41:25 PM »
Brent, did you get the finish on these heads from a wheelabrator machine ?

Baked, steel abrated.
Brent Lykins
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