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Calling all the Head Gurus!

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MG Cruiser Gold Member Keith Delta4
Rockingham, WA, Australia   AUS
1970 MG MGB "Moneypit"
Looking at the casting numbers, is this a good head to modify?
Already checked and crack clear. Thanks, Keith

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4ABD5AB2-80B9-4618-994C-6384C4B0B28A.jpg    46.4 KB
4ABD5AB2-80B9-4618-994C-6384C4B0B28A.jpg

Rod H. Avatar
Amity, OR, USA   USA
1964 MG MGB
1968 MG MGB GT
http://www.flowspeed.com/cylinder-ident.htm

Sean Brown's writeup above should help you. The 2709 is mentioned under the 2923 heading.



I can't understand why people are frightened of new ideas. I'm frightened of the old ones. John Cage

'63 MGB
'68 MGBGT
'80 VW Vanagon Kombi
'09 Mazda 3 with 5 speed manual



Edited 1 time(s). Last edit at 2018-02-14 01:12 AM by Rod H..

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MG Cruiser Gold Member Keith Delta4
Rockingham, WA, Australia   AUS
1970 MG MGB "Moneypit"
Thanks Rod.

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Basil Adams Avatar
About 12 miles from Sears Point, CA, USA   USA
2709 is the non-smog version of 2923. Oddly, there was also a smog version - 12H2708. This is the head that the new, cast iron heads are cloned from. It's a solid piece and if it magnafluxes, I would use it despite the big ports. If you want high intake velocity, the 12H 906 and 12H1326 are better. But if you're doing minor modifications to a street head and are not as concerned about intake velocity as you are concerned about volume, that's a good head to star with, I have a 2709 for the back up head for my race car but after $2800 of porting and flow bench work, it still can't produce the flow my 906 head does (both done by the same guy.). But if I were building an SCCA limited prep car, that's a good head because it lacks the smog ports of the 2983 smiling smiley Best of luck. Basil 707.762.0974 basiladams@yahoo.com



Basil C. Adams
1956 MGA Coupe (Show Car)
1957 MGA Roadster (Driver)
1958 MGA Coupe (Racecar)
1959 MGA Coupe (unrestored)
1960 MGA Coupe (unrestored)
1960 MGA Roadster (Driver)
MKIII Elva Courier (E1056)
1967 427 Cobra
1972 Alfa Romeo Montreal
A coupla late MGBs
1960 Austin Healy BN7
More Cars than Brains

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MG Cruiser Gold Member Keith Delta4
Rockingham, WA, Australia   AUS
1970 MG MGB "Moneypit"
The right sounds are being made regarding this head. Thanks for the input, again, Basil! Keith

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BFC Ben Clark
Allegan, MI, USA   USA
1980 MG MGB "Kilr B"
When I first saw the title of this thread, I thought I was going to have to call my girlfriend over to answer a question.

(Sound of crickets)

Thank you! Good night! Drive safe! I’ll be here all week.



I don't know. It's always smoked like that/made that sound/done that.

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