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Billy Nees · 02-15-2021, 10:33 AM

The 185 and 339 heads cc at more like 72-73 cc. I had a heck of a time getting my 339 heads down to the NHRA spec. of 66 cc. The 991 head looks to me like a 350 truck head and has an even bigger chamber.
The 73 heads actually do have 1.94 intakes, huge chambers and 350 style ports and IMHO are much too big to be considered for a STOCK 307. If you've ever driven a 73/307, they are real dogs.

02-15-2021, 10:33 AM	#7
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,504 Likes: 3,606 Liked 7,814 Times in 1,748 Posts	Re: 307 sbc head The 185 and 339 heads cc at more like 72-73 cc. I had a heck of a time getting my 339 heads down to the NHRA spec. of 66 cc. The 991 head looks to me like a 350 truck head and has an even bigger chamber. The 73 heads actually do have 1.94 intakes, huge chambers and 350 style ports and IMHO are much too big to be considered for a STOCK 307. If you've ever driven a 73/307, they are real dogs. __________________ Billy Nees 1188 STK, SS I'm not spending 100K to win 2K