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Combustion Chamber Size

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Matthew68
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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...

Cheers,
Matthew
1968 Mustang Coupe 200ci - Pertronix + Coil
Gulfstream Aqua - Interior + Exterior

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bubba22349
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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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I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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xctasy
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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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fast64ranchero
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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.
Walt
63 Ranchero,1965 Mercury Comet Convert V-8, 1978 Fairmont small six, mill'd off intake, 62-1 ET 12.332 @ 123.49 mph (gone)

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