Mopar '340-X' Heads vs. Chevy 'Fuelie Heads'

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69 Cuda 440

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'The Battle of the Small-Block High-Rev Cylinder Heads'

Let the 'Air-Flow' begin >

Engine ....... Head Name ......... Casting # ......... Years .........

Mopar 340 ......'X' Heads ........... #2531894 ...... {1968, 1969, 1970}

Chevy 327 ..... 'Fuelie Heads'
 
Mopar 340 'X' Heads

Casting # ...... 2531894
Years ............ 1968, 1969, 1970

Factory Combustion Chamber .... 72.0 CC
NHRA Minimum ........................ 63.5 CC

Intake Valve ............................ 2.02"
Exhaust Valve .......................... 1.60"

Intake Port Volume ................... 160 CC
Exhaust Port Volume ................... 70 CC

Intake Port Size ........................ 1.08" Wide x 2.17" Height
Exhaust Port Size ...................... 1.25" Wide x 1.75" Height

Intake Bowl Size ....................... 1.75" {86.7% of Intake Valve}

~ CFM Flow ~

Lift ....... Intake ... Exhaust
.100" ......... 60 .......... 50
.200" ........ 120 ........ 104
.300" ........ 173 ........ 131
.400" ........ 210 ........ 143
.500" ........ 218 ........ 145
 
Chevy 'Fuelie Heads'

The 1st 'Fuelie Heads' were found on the 283/315 HP 'Fuel Injection' Engine, and then on the 1962 > 327/340 HP and 327/360 HP 'Fuel Injection' Engine.

Casting #3782461X

The 1st 'Fuelie Heads' came through with 1.94" Intakes and 1.50" Exhaust Valves.

Also noted as the 'Double Hump' or '461X' Castings.

Intake Port Runners ....... 171 CC
Exhaust Port Runners ....... 64 CC

From the Factory, these 'Fuelie Heads' had 64.0 CC Combustion Chambers.

The 'NHRA' minimum level is listed at 62.2 CC's.
 
I read that Chrysler used those Chevy heads as a template for the 340 X heads.
 
Chevy 'Fuelie Heads' {Early}

Casting #3782461 {Year; 1963}

Intake Valve ............... 1.94"
Exhaust Valve ............. 1.50"

Intake Throat Size ....... 1.59" {82.0% of Intake Valve}
Exhaust Throat Size ..... 1.30"

Intake Volume ............ 161 CC
Exhaust Volume ........... 62 CC

Intake Port Size ........... 1.07" Wide x 1.93 " Height
Exhaust Port Size ......... 1.30" Wide x 1.40" Height

Intake Runner Length .... 5.04"
Exhaust Runner Length .. 2.51"

~ CFM Flow ~

Lift ......... Intake
.100" ........... 75
.200" .......... 128
.300" .......... 156
.400" .......... 196
.500" .......... 204
 
Looks like it's gonna be close. Now, what about the later big valve heads.
 
The heads can flow all they want. If they have a sissy *** motor all around them, it's worthless.
 
duster360 said:
Looks like it's gonna be close. Now, what about the later big valve heads.
Click to expand...

Castings #3782461X

These Heads came through with the {172 CC} Intake Runners.

Bill 'Grumpy' Jenkins went through many sets, to find the ones that had
6 to 8 greater CC volume.

Casting Numbers

#3782461X ......... 1960 thru 1963 ...... 283 'Fuel Injected' and 327 'Fuel Injected'
#3782461 ........... 1964 thru 1966 ...... 327 'Fuel Injected' and Special High Performance

Note:
The 1st Year for the larger Valves {2.02" Intake and 1.60" Exhaust} was
in 1964.
 
First up, please explain the difference between tests 1&2 for the 340 head. 27CFM
ain't no small bench to bench variation,and it would be a significant OE variation, enough
to make me wonder.I have seen gifted X heads flow 240CFM, and 220 sounds like the low
end of the casting,the bowls are wider than J castings by a bit.
The numbers for the 461 look about right for those,there weren't any super changes
in the "double hump" line, but again gifted castings w/the larger OE valves are a plus if you
are running a class limiting mods.The newer open chamber SB chebby heads outflow those
handily,but run worse because the 2humps had a double squish chamber w/the fast burn
to go with it.
Lol,mopar definitely did NOT pattern the X after those things!!They for sure had a set
to see what the competition was doing,but there is nothing in common between them.The
BB chrysler and SB chevy have LOTS of things in common,most of them not good.Poor plug
location,valves open past and away from the cyl. center(big shrouding),etc.
 
Johnny GM

~ 'Fuelie Heads' ~

Rochester Fuel Injection
1960 .......... 283/315 HP ....... 1.94 ~ 1.50 ..... 62.2 CC
1961 .......... 283/315 HP ....... 1.94 ~ 1.50 ..... 62.2 CC
1962 .......... 327/360 HP ....... 1.94 ~ 1.50 ..... 62.2 CC
1963 .......... 327/360 HP ....... 1.94 ~ 1.50 ..... 58.2 CC
1964 .......... 327/375 HP ....... 2.02 ~ 1.60 ..... 58.6 CC
1965 .......... 327/375 HP ....... 2.02 ~ 1.60 ..... 58.6 CC

Holley Carburetor {L-79}
1966 .......... 327/350 HP ....... 2.02 ~ 1.60 ...... 61.2 CC
1967 .......... 327/350 HP ....... 2.02 ~ 1.60 ...... 61.2 CC
 
Johnny GM,

Let me show you something

Lift ....... #3890462 ..... #3917291

.100" .............. 75 ............. 75
.200" ............ 128 ............ 129
.300" ............ 156 ............ 160
.400" ............ 196 ............ 202
.500" ............ 204 ............ 208

The #3890462 Head is fitted with 1.94" Intake Valves

The #3917291 Head is fitted with 2.02" Intake Valves.

Both Heads have the same identical Volume .. 171 CC's.

And, both Heads had the same identical Intake Throat size {1.59"}
 
'340-X' #2531894

Getting those Flow Numbers

Port Volume ...... Intake = 158 CC's ---- Exhaust = 73 CC's

Lift ........... Intake / Exhaust
.100 ............... 58 .... 45
.200 .............. 125 ... 95
.300 .............. 172 .. 122
.400 .............. 208 .. 135
.500 .............. 221 .. 140
 
Mr. Mouse

> 3782461X ........... 1960 thru 1963
> 3782461 ............. 1961 thru 1970

> 3782462 ............. 1965 thru 1967
> 3849820 ............. 1965

> 3890462 ............. 1962 thru 1968
> 3891492 ............. 1964 thru 1967

> 3917291 ............. 1967 and 1969
> 3917292 ............. 1967 and 1968

> 3927186 ............ 1968 thru 1972
> 3947041 ............ 1968 thru 1970

> 3973414 ............ 1969 and 1970
 
I remember some of the earlier 461 castings,have bigger cc exhaust & a higher short side radius on the exhaust ports. Compared early '62-'63 castings,to later '66-'67 castings. Both unported,don't remember valve diameters... You know anything,about this 69 440 ?
 
Abodybomber said:
I remember some of the earlier 461 castings,have bigger cc exhaust & a higher short side radius on the exhaust ports. Compared early '62-'63 castings,to later '66-'67 castings. Both unported,don't remember valve diameters... You know anything,about this 69 440 ?
Click to expand...

Correct Mr. A-Body-Bomber

#3782461 Heads

Came both with > 1.94 / 1.50 and 2.02 / 1.60 Valves from 1964 and on.

The 1961 thru 1963 Heads, were definitely 1.94 / 1.50 {only}.

On the Exhaust Port, some of the Heads did come through with larger volume {63+ CC's}.
 
If a 340 was rated at 275hp and the mopar heads flow just as goods the GM, where did the GM 327 get that extra 90hp ( 360 hp ) advantage over ma mopar.
 
The battle of the 302 Chevy, 302 Ford and 340 Mopar was a good one in all forms of racing. the Chevy usually came out on top. The Ford head had such a large port and shitty air speed the Chevy would beat it up all the time proving more isnt better.
 
69 Cuda 440 said:
Correct Mr. A-Body-Bomber

#3782461 Heads

Came both with > 1.94 / 1.50 and 2.02 / 1.60 Valves from 1964 and on.

The 1961 thru 1963 Heads, were definitely 1.94 / 1.50 {only}.

On the Exhaust Port, some of the Heads did come through with larger volume {63+ CC's}.
Click to expand...

Thanks,'69 .. I didn't think I was doofy, when I saw those port's in the late '80's. ( listening to Hendrix, /'67 BBC sessions, great rock...)
 
duster360 said:
If a 340 was rated at 275hp and the mopar heads flow just as goods the GM, where did the GM 327 get that extra 90hp ( 360 hp ) advantage over ma mopar.
Click to expand...

Me thinks me smells some... Hold on... Yes definitely... Me smells some BULLSHIT
 
Horsepower

Well, we all know by now that the 340 was pushing 300 HP.

The NHRA was not fooled back then, and adjusted the Horsepower accordingly to '310'.
-----------------------------------------------------------------------------------------------

OK, regarding the 1963 Chevy Corvette 'Fuelie' ..... 327/360 HP

* Compression Ratio ................. 11.25-1 {Domed Pistons}
* #3782461X Heads .................. 1.94" Intake / 1.50" Exhaust ~ 58.2 CC's
* '097' ~ 'Mechanical' Camshaft .. .394"/.400" Lift ~ 287*/287* Duration ~ 66* Overlap
* Rochester Fuel Injection

Note; The #3782461X Heads had the large Intake Ports {171 CC}.

360 HP @ 6000 RPM's
352 Ft/Lbs. @ 4000 RPM's
 
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