1973dusterkid
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I bought a set of 340 head numbers on them are 34189150 what do I have they are J heads big valves.
340 heads I bought
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OldmanRick
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1973dusterkid
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Its big valve I know that but not sure it it closed chamber and what cc it is.
OldmanRick
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According to that chart the're 63cc, but the factory tolerence would probably be a few cc's either way, usually to the bigger side. This is assuming over the years they haven't been surfaced. Good set of heads but will have to check the chambers for a exact #.
The J heads were all open chamber heads and they all blueprinted around 68ccs. Some of them charts are full of crap. What are you talkin about puttin these on? A 318? Get ready to lose some power.
1973dusterkid
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Got a 70 casting 360 with 340 heads and 4bbr intake will have a build thread maybe tommaro.
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