|
02-14-2021, 08:11 PM | #1 |
Junior Member
Join Date: Apr 2003
Posts: 45
Likes: 15
Liked 1 Time in 1 Post
|
307 sbc head
Could someone give me the casting number and conbustion chamber. Thanks
|
02-14-2021, 08:51 PM | #2 |
Member
Join Date: Apr 2005
Location: san antonio tx
Posts: 255
Likes: 5
Liked 28 Times in 15 Posts
|
Re: 307 sbc head
Blue print specs on NHRA site or ask Billy Nees.
|
Liked |
02-14-2021, 09:07 PM | #3 |
VIP Member
Join Date: Dec 2001
Location: Texarkana Ark/TX
Posts: 2,352
Likes: 437
Liked 678 Times in 262 Posts
|
Re: 307 sbc head
Year & model??
If your looking for NHRA specs: http://www.nhraracer.com/ Go to the year and model specific specs. For just General specs: http://outintheshop.com/faq/casting/castings2.html Hope that helps
__________________
Adger Smith (Former SS) |
02-14-2021, 09:43 PM | #4 |
Junior Member
Join Date: Apr 2003
Posts: 45
Likes: 15
Liked 1 Time in 1 Post
|
Re: 307 sbc head
Thanks big help
|
02-15-2021, 09:32 AM | #5 |
VIP Member
Join Date: Oct 2002
Location: On a hilltop in Pa.
Posts: 4,224
Likes: 3,103
Liked 6,793 Times in 1,524 Posts
|
Re: 307 sbc head
Why would anyone in their right-mind be asking about 307 head castings???
__________________
Billy Nees 1188 STK, SS World's greatest Under-Achiever! |
Liked |
02-15-2021, 09:56 AM | #6 | |
VIP Member
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
Posts: 1,980
Likes: 53
Liked 724 Times in 177 Posts
|
Re: 307 sbc head
Quote:
1973 is an anomaly. That year the 307 is shown using 333881, 333882, 3973493 and 3998993 heads. The specs also show 1.94" intake and 1.50" exhaust valves with the same 66.1cc combustion chamber as the '71-'72 heads. These are normally considered "350" heads with large ports and a wider combustion chamber. I could easily doubt that those are the correct production heads since Chevrolet did not use those large valves on small bore engines (except the '60-'61 283 high perf Corvette engines). Maybe another gift from the NHRA tech department and an errant data entry person. But, being legal doesn't always mean being "right".
__________________
Last edited by Dwight Southerland; 02-15-2021 at 10:04 AM. |
|
02-15-2021, 10:33 AM | #7 |
VIP Member
Join Date: Oct 2002
Location: On a hilltop in Pa.
Posts: 4,224
Likes: 3,103
Liked 6,793 Times in 1,524 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 World's greatest Under-Achiever! |
Liked |
02-15-2021, 05:50 PM | #8 |
Member
Join Date: Dec 2009
Posts: 228
Likes: 14
Liked 186 Times in 63 Posts
|
Re: 307 sbc head
|
02-15-2021, 05:53 PM | #9 | |
Member
Join Date: Dec 2009
Posts: 228
Likes: 14
Liked 186 Times in 63 Posts
|
Re: 307 sbc head
Quote:
|
|
02-15-2021, 07:35 PM | #10 |
VIP Member
Join Date: Oct 2002
Location: On a hilltop in Pa.
Posts: 4,224
Likes: 3,103
Liked 6,793 Times in 1,524 Posts
|
Re: 307 sbc head
__________________
Billy Nees 1188 STK, SS World's greatest Under-Achiever! |
|
|