The Ford Barn

jeepguy1948 · 06-02-2024, 12:56 PM

FWIW Edlebrock make 2 different heads 1115 with 64 CC and 1116 with 75 CC. They are in fact the same casting but the 1116 chambers have been hogged out some. We are currently dealing with some 1115 heads that CC 74 after many tests. I realize that my measurements are not perfect but my results are consistent (these heads are new, not used. We have another set of heads on the way and I will measure them as well. I would not normally measure new heads but the valve area looked huge compared to the heads we took off. For quite awhile we thought that the heads were in the wrong box because Edlebrock does not mark the heads in any way to identify which ones they are, you can only tell by looking at the chamber. The larger ones are aimed at 7.5:1 for blower motors and such. We are waiting on that new pair of heads to arrive to pursue the question some more (the first pair has already been returned).. I know enough to take surface tension into account (I am not using a plate over the chamber) but I have been very careful and I can’t see me being off by 10 CC. The Edlebrock heads we removed from the motor have undoubtedly been milled (at least one of them for sure) but they measured 64cc. I find it hard to believe that a Flathead could be milled enough to change the chamber that much. Also, there was no interference with the piston nor the valves with a Max 1 cam. When using a depth gauge the “new” heads measured a full .125” deeper over the valve pocket as compared to the “old” heads.

06-02-2024, 12:56 PM	#21
jeepguy1948 Senior Member Join Date: Jan 2022 Posts: 1,047	Re: Evans Aluminum Heads FWIW Edlebrock make 2 different heads 1115 with 64 CC and 1116 with 75 CC. They are in fact the same casting but the 1116 chambers have been hogged out some. We are currently dealing with some 1115 heads that CC 74 after many tests. I realize that my measurements are not perfect but my results are consistent (these heads are new, not used. We have another set of heads on the way and I will measure them as well. I would not normally measure new heads but the valve area looked huge compared to the heads we took off. For quite awhile we thought that the heads were in the wrong box because Edlebrock does not mark the heads in any way to identify which ones they are, you can only tell by looking at the chamber. The larger ones are aimed at 7.5:1 for blower motors and such. We are waiting on that new pair of heads to arrive to pursue the question some more (the first pair has already been returned).. I know enough to take surface tension into account (I am not using a plate over the chamber) but I have been very careful and I can’t see me being off by 10 CC. The Edlebrock heads we removed from the motor have undoubtedly been milled (at least one of them for sure) but they measured 64cc. I find it hard to believe that a Flathead could be milled enough to change the chamber that much. Also, there was no interference with the piston nor the valves with a Max 1 cam. When using a depth gauge the “new” heads measured a full .125” deeper over the valve pocket as compared to the “old” heads.