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Combustion Chamber Size

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Combustion Chamber Size

Post #1 by Matthew68 » Thu Mar 07, 2019 10:44 pm

What’s the “stock” combustion chamber size on the aluminum head? I’ve dug through the forums and found a post from Mike W stating 55ccs but that they could also leave a little meat to 56-57ccs.

I have a head coming to me from Matt, but he’s bogged down. Anyone out there have a measured size? Trying to sort out some camshaft stuff and working to look at possible compression ratio...

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Re: Combustion Chamber Size

Post #2 by bubba22349 » Fri Mar 08, 2019 2:46 pm

Well there really wasn't any stock size on the Aluminum C.I. / V.I. heads, reports in past very from 52 CC and bigger so you will need to CC your head to know. Good luck :thumbup: :nod:
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Re: Combustion Chamber Size

Post #3 by xctasy » Sat Mar 09, 2019 3:41 am

56 cc's. The earlier versions had more, but its alloy and has great detonation resistance.

Early iron heads were 52cc, then went to 59 to 62 cc in the 200 and 250 in 1968-69 and stayed that way till the 80's. The 170 stayed 52cc, the Aussie head it wad based on stayed 59.5 nominal.
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Re: Combustion Chamber Size

Post #4 by fast64ranchero » Mon Mar 11, 2019 5:08 pm

My head was 56cc after porting and unshrouding the valves. After milling it is 53.2cc's the flat milling specs on CI tech page turned to be spot on.
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