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Author Topic: Head casting numbers  (Read 27678 times)

Offline dumbucket1

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Head casting numbers
« on: October 15, 2009, 12:58:09 PM »
Mortec doesn't have it listed. Can any one tell me if casting 346238 are peanut port heads. Thanks
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Offline Captkaos

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Re: Head casting numbers
« Reply #1 on: October 15, 2009, 04:28:52 PM »
Yes they are.
346238 = 1975-87 454 Open 113.0cc
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Offline dumbucket1

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Re: Head casting numbers
« Reply #2 on: October 15, 2009, 05:52:46 PM »
Ok I saw them on craigslist and didn't know if they were worth fooling with.
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Offline malibu795

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Re: Head casting numbers
« Reply #3 on: October 18, 2009, 05:13:43 PM »
Quote from: Captkaos on October 15, 2009, 04:28:52 PM
Yes they are.
346238 = 1975-87 454 Open 113.0cc
just because they are o-port doesnt mean they are peanut head..

chevymainia.. doesnt list as peanutt port heads..

i got a set of peanut o-por heads... and regular O-port heads

i can snap a picture tomorrow if that helps

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adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline Engineer

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Re: Head casting numbers
« Reply #4 on: October 18, 2009, 05:53:22 PM »
I have been building BBCs for 20+ years, and have never heard of a "peanut port".

What is a peanut port?
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2001 Chevy 2500HD 4x4 6.0/4L85E EC/SB
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1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454

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Offline malibu795

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Re: Head casting numbers
« Reply #5 on: October 19, 2009, 10:36:05 AM »
Quote from: Engineer on October 18, 2009, 05:53:22 PM
I have been building BBCs for 20+ years, and have never heard of a "peanut port".

What is a peanut port?
peanut is o-port is ~25% smaller then a std o-port.. rough 200-220cc vs the 250-260cc intake runners..
 both run 2.06/1.77 vlvs
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adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline Captkaos

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Re: Head casting numbers
« Reply #6 on: October 19, 2009, 04:04:20 PM »
All cylinder heads that were on Truck motors from 75 forward ARE peanut port heads, so I can pretty much say that they ARE peanut port heads.

This is a comparison of the 2:
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Offline Engineer

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Re: Head casting numbers
« Reply #7 on: October 19, 2009, 04:47:58 PM »
10-4 on the peanut ports.

Capt, what is the casting # on the cylinder head in the left of the photo?

I have the 353049 casting heads on my 454. These puppies are nasty. Adding 2.19/1.88s helped them breathe slightly better, but the ports needed worked a little to take full advantage of the bigger valves.

If building a street engine, or a 4x4 off road engine, there isn't a head that is much better than the 353049 (1973), or the 336781 (1974) castings. I guess these are the true oval ports.

I would recommend the 2.19/1.88s, with the pocket porting, and intake gasket match, and hang on.  :o

One other little mod is to polish the combustion chambers. That is good for a couple of ponies as well.
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2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L85E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454

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Offline Captkaos

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Re: Head casting numbers
« Reply #8 on: October 19, 2009, 05:03:04 PM »
The ovals are 049's, they ARE oval ports.
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Offline malibu795

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Re: Head casting numbers
« Reply #9 on: October 19, 2009, 05:06:01 PM »
Quote from: Engineer on October 19, 2009, 04:47:58 PM
10-4 on the peanut ports.

Capt, what is the casting # on the cylinder head in the left of the photo?

I have the 353049 casting heads on my 454. These puppies are nasty. Adding 2.19/1.88s helped them breathe slightly better, but the ports needed worked a little to take full advantage of the bigger valves.

If building a street engine, or a 4x4 off road engine, there isn't a head that is much better than the 353049 (1973), or the 336781 (1974) castings. I guess these are the true oval ports.

I would recommend the 2.19/1.88s, with the pocket porting, and intake gasket match, and hang on.  :o

One other little mod is to polish the combustion chambers. That is good for a couple of ponies as well.
i got a 781 casting head with 2.06/1.75 valves. i havent CC then intake or exhuast runners yet. i did flow bench them on a SF-600 @ 28inHg
intake flow rates
.100  72cfm
.150  80cfm
.200  99
.300 130
.400 246
.500 253
.550 257
exhaust flow
.100 73
.150 97
.200 115
.300 146
.400 163
.500 179
.550 182

short turn is pretty rough to say the best.. 2.19/1.88 would be very nice.... i might do that and new guides as well...

im currently getting a short block back inspecs.. mains, bore, deck balanced.. still up between a 3cc FT or a -12cc dome piston from KB.

in comparison.. world casting O-port heads http://www.worldcastings.com/products/merlin-oval-port-iron-heads.html flow this @.800"
316 intake, 290 exhaust (Super Flow 600)
All heads flowed with a standard .750" intake plate, without exhaust tube, and 28" of water.
« Last Edit: October 19, 2009, 05:11:55 PM by malibu795 »
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adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline Engineer

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Re: Head casting numbers
« Reply #10 on: October 19, 2009, 07:35:16 PM »
Do any of you guys know anything about the 343772 head?
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2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L85E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454

Dad of an Eagle Scout, and a Life Scout

Offline Captkaos

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Re: Head casting numbers
« Reply #11 on: October 19, 2009, 08:21:12 PM »
AFAIK 343772 are peanut Port heads.  Great for low end power, crappy for anything else.

The good Oval Port heads are 781s or 049s  I honestly wouldn't put money in any other factory oval port BBC head.
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Offline malibu795

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Re: Head casting numbers
« Reply #12 on: October 20, 2009, 04:34:52 PM »
Quote from: malibu795 on October 19, 2009, 05:06:01 PM
in comparison.. world casting O-port heads http://www.worldcastings.com/products/merlin-oval-port-iron-heads.html flow this @.800"
316 intake, 290 exhaust (Super Flow 600)
All heads flowed with a standard .750" intake plate, without exhaust tube, and 28" of water.
heres then flwo numbers ate a more respect lift.. compared to 253/179 @.500.. with a 2.06/1.77  10% difference
Quote
with a 2.3/1.88 valves
@ .500 - Intake 277, Exhaust 227
@ .600 - Intake 285, Exhaust 249


Regards,

Scott Nelson
Engineer
World Products
(631) 981-1918 x137
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adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline joesgarage71

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Re: Head casting numbers
« Reply #13 on: October 20, 2009, 06:39:05 PM »
I have 781's with 2.25/1.88 pocket ported and they work great. there are alot of BB out there making around 600HP with these heads 049's too!(port work of course)

I found some stuff from this guy racer1320 good readin
http://www.chevelles.com/forums/showthread.php?t=23714&highlight=468+combo

http://www.chevelles.com/forums/showthread.php?t=57753

More stuff
http://users.erols.com/srweiss/tablehdc.htm#Chevy_Big_Block
« Last Edit: October 20, 2009, 07:44:11 PM by joesgarage71 »
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Offline dumbucket1

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Re: Head casting numbers
« Reply #14 on: October 20, 2009, 09:37:15 PM »
Some good info here. I used to have a set of 781 castings, dont remember what I ever did with them though.
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