They are light head castings and are prone to cracking. There are a few different 882 castings out here. For instance 333882, 3238882, etc. The easiest way to check if yours is. Just as a comparison it went much harder than an identical 350 running the more common 882 heads. Depending on the cam, intake, pistons, and headers you run, you might. The 993 is a 'heavy' casting 76cc chamber head that is actually not bad for performance work. Before the advent of the sportsman ii heads. This head was tested with the 1. 94/1. 50 valves. I’ve got some 1974 882 to heads on my 383. Anyone know what the spark plug reach spec is for this head? I’m thinking about going with a nkg heat range of 5. The heads are casting 882. 76cc 1. 94/1. 50. Best i can find is a fairly consistent >200cfm rating. In the garage is a well used 350 wearing some heads with casting 993. The 882 head is the most produced chevy cylinder head over and above all other casting numbers. They were produced in the millions and if you are rebuilding a 70's era 350,. I did the math on pat kelleys calculator and i came up with 9. 2:1 with these heads and 10. 4:1 with 64cc heads that i planned on using. I`m going to see if the machine shop can. 882 heads are not as bad as some say, i have 390hp out of the motor in kims wagon. All i had done to the head was have them cleaned up, new valve guides installed and install the new springs for the cam. I'm getting ready to rebuild my 400 sbc and am on a tight budget. It has the original 882 heads on it. I was wondering if these heads would be decent or if they are junk? I have read several articles recently where folks are talking about 882 heads as if they were really the cream of the crop. I assume that the 882 refers to the serial number. The vortecs not only out flow the '882 head below 0. 400 valve lift but that smaller combustion chamber is heart shaped not wedge shaped which improves the mixture swirl to. The heads have a tendency to crack, and are factory with 1. 940 intake valves and 1. 500 exhaust valves. Now, we blueprinted the heads to 63. 3cc chamber size, and with all.
