small block heads

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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
 
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
4343475-a
 
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
 
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"
 
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
 
That casting number does not match up with the year either maybe someone swapped the heads at some point
 
72-73 seems to be typical for the larger open chamber heads. 80 or so would be well out of the normal range.
 
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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
 
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.
 
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