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how do you determine what ccs heads you have
Measure them to be sure. Manufacturers specs are not too accurate.
You have to cc them take a piece of plexiglas and seal it over the chambers and the fill them with a liquid measuring the liquid remaining in the tub. I always used a 100 cc tube and then subtract how much is left. That will give you how much you used.
75 post up your casting number and year if you know it- those here can give you a worst case low cr high cc guess of course if they have been milled along the way cc's would be less, cr higher real original ccs may be 5 ccs greater than published numbers - which turn out to be the MINIMUM that race sanctioning bodies will accept for example 74cc adv BBM 915's are closer to 80 and open chambers vary from 86 to 90 gasket thickness- almost no one builds with .020 or under steel shims unless you are a class racer .028 and around .040 are much more common pistons vary in compression height and valve pocket cc's taken together they can add up to quite a difference
Those are 360 heads
wyrmrider, I dont if it will help but the motor is out of a 76 model van and has the big 2 inch valves and i think 1.75 is the other
yes out of a 76 model van
Probably around 1986? They are probably close to 80ccs
motor is 1976
2.02 valves in a van? someone has been into this motor before best to cc them but the estimate is close to do some "what if's"
a camper van motor had never been into till i did it about 9 years ago n health got bad and didnt finish but stating on it again
so i will probably have alot more questions on here as i go
That casting number does not match up with the year either maybe someone swapped the heads at some point
I 99.99% seeeeeriously doubt those are 80 cc chambers. More likely 73 or so....
I cc my 360 heads and years back and they 76-77 range maybe I'm mistaken or did it wrong lol
72-73 seems to be typical for the larger open chamber heads. 80 or so would be well out of the normal range.
I talk to the guy I got the motor from n he said it came out of a one ton camper van
What’s on the head surface? A little grease on the head to seal the plexi glass. Just make sure a bunch doesn’t squeeze into the chamber.
no they have been rapped in saranwrap for 9 years to keep them from rusting very bad yesterday was the first time they have been unrapped since I got them back from machine shop.i was just showin some the valves n casting number and the info i got from the guy i got them from cause they said they didnt come out of a van and they didnt come of a 76 model and his dad bought the van brand new
Noone here disagreed with you on the year or what they came off of. That is a later casting number so I said 80s you said 1976 i never disagreed with you. Then someone said something about the valve size . Noone is disputing you !? That casting number is also found on 318 4bbl engines which used 360 heads and intake. I think they where used from 75-84. As for the valve size I have no idea I have never had of those heads my 360 heads have 1.88 intake valves and my 318 has 1.78. I personally have never seen a stock 360 head with 2.02 valves but that doesn't mean nothing.