327/275hp

Darrin Christen · 07-19-2011, 06:05 AM

Having some trouble understanding which carbs are legal for the 327/275 combo in a super stock 1966-67 chevy II. Also where is the wheelbase specification located in the guides? Is it the number that is listed just after the different models? Thanks.

Adger Smith · 07-19-2011, 06:58 AM

Yep on WB 110 for 66 & 67
Looks like the 66 is listed with a Holley and has a Carter and Q jet as optional
1967 is listed with Q jet only with some optional part number Q-jets

1966
275 327 10.25 1-4 Holl R-3123A/SM, 3230A/PG, 3872783 1.50 H 57.5 8,17
8 Alt carbs - Cart AVS-4027S/SM 4028S/PG Roch 4MV-7026203/SM 7026202/PG
Carb sizes = Holl 1500x1500/1187/1250 Cart 1562x1686/1250xAV Roch 1375x2250/1093xAV
17 Alt manifold – 3875954 = Roch Qjet; 3872783 = Holley & Carter carburetor, 3860384, 3905393, 3919803

1967
275 327 10.00 1-4 Roch 4MV-7027213/SM 7027212/AUTO 3905393 1.50 H 57.5 9,17
9 - Alt carb-7027313/SM 7027312/AUTO Carb size-1375x2250/1093xAV
17 - Alt manifold - 3919803,3860384,3872783,3875954
Looks like there are some manifold numbers mixed up between the two years. How does a Q jet fit on a Holley manifold? Hummm!! The way I'm reading that something is wrong or I can't follow it. If I was familar with the manifolds I might follow it. OOPS!! I almost said "Follow their Logic" Now that would have been funny.
Looks like the Q-jet is bigger than the small Carter & Holley in 66. Same size Q-jet in both 66 and 67. Q-jet only in 67.

Darrin Christen · 07-19-2011, 07:13 AM

Thanks for the reply Adger. So if using a Q-Jet does it have to be the correct part #, or just the correct size, or both? Would the carb be interchangable with a 66 or 67 as long as the size is correct? How does NHRA measure the size? Sorry for all the ?s.

Ed Carpenter · 07-19-2011, 02:04 PM

Darrin I run a 207 Q-Jet. If you have any questions about the Q-jet call Dean Oliver. He did my carb. He is the man. He can tell you anything you need to know about it. We run a Victor E manifold with a 2" spacer and an adapter to mount the Q-Jet to that spacer. Standard set up. That car of yours belongs in SS. Ed

Adger Smith · 07-19-2011, 05:10 PM

Bore size is all that is checked. I'm pretty sure numbers are not an issue any more on carbs. I've had Wesley check mine a few times and he does it a little different, some times. He uses the points of the calipers on the bore at the throttle shaft. (Better watch, they wear there... I've seen atleast one Comp guy tossed because of the bore being worn past the size limit at that point) Then he has had a go/no go tool he dropped in the main body. He has also used dividers to measure the main body, in several places. One time He had me pull the base plate and measured from the back side of the booster to see if I had oval shaped the bore. Good Tech guys don't miss too much. :~) Sometimes it is safe to get checked beforehand and sealed. Saves you that big OOOPS!
It looks like the Q-jet is listed with the same bore sizes for 66 &67 so it should be the same carb for both years.

Darrin Christen · 07-19-2011, 06:26 PM

Thanks for the help guys.

07-19-2011, 06:05 AM	#1
Darrin Christen Member Join Date: Mar 2007 Location: Des Allemands, LA Posts: 365 Likes: 8 Liked 1 Time in 1 Post	327/275hp Having some trouble understanding which carbs are legal for the 327/275 combo in a super stock 1966-67 chevy II. Also where is the wheelbase specification located in the guides? Is it the number that is listed just after the different models? Thanks. __________________ 4878 SS/GA 66CHEVY II

07-19-2011, 06:58 AM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: 327/275hp Yep on WB 110 for 66 & 67 Looks like the 66 is listed with a Holley and has a Carter and Q jet as optional 1967 is listed with Q jet only with some optional part number Q-jets 1966 275 327 10.25 1-4 Holl R-3123A/SM, 3230A/PG, 3872783 1.50 H 57.5 8,17 8 Alt carbs - Cart AVS-4027S/SM 4028S/PG Roch 4MV-7026203/SM 7026202/PG Carb sizes = Holl 1500x1500/1187/1250 Cart 1562x1686/1250xAV Roch 1375x2250/1093xAV 17 Alt manifold – 3875954 = Roch Qjet; 3872783 = Holley & Carter carburetor, 3860384, 3905393, 3919803 1967 275 327 10.00 1-4 Roch 4MV-7027213/SM 7027212/AUTO 3905393 1.50 H 57.5 9,17 9 - Alt carb-7027313/SM 7027312/AUTO Carb size-1375x2250/1093xAV 17 - Alt manifold - 3919803,3860384,3872783,3875954 Looks like there are some manifold numbers mixed up between the two years. How does a Q jet fit on a Holley manifold? Hummm!! The way I'm reading that something is wrong or I can't follow it. If I was familar with the manifolds I might follow it. OOPS!! I almost said "Follow their Logic" Now that would have been funny. Looks like the Q-jet is bigger than the small Carter & Holley in 66. Same size Q-jet in both 66 and 67. Q-jet only in 67. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 07-19-2011 at 07:01 AM. Reason: sp

07-19-2011, 07:13 AM	#3
Darrin Christen Member Join Date: Mar 2007 Location: Des Allemands, LA Posts: 365 Likes: 8 Liked 1 Time in 1 Post	Re: 327/275hp Thanks for the reply Adger. So if using a Q-Jet does it have to be the correct part #, or just the correct size, or both? Would the carb be interchangable with a 66 or 67 as long as the size is correct? How does NHRA measure the size? Sorry for all the ?s. __________________ 4878 SS/GA 66CHEVY II

07-19-2011, 02:04 PM	#4
Ed Carpenter Live Reporter Join Date: May 2006 Location: Dripping Springs, Tx Posts: 2,709 Likes: 186 Liked 520 Times in 132 Posts	Re: 327/275hp Darrin I run a 207 Q-Jet. If you have any questions about the Q-jet call Dean Oliver. He did my carb. He is the man. He can tell you anything you need to know about it. We run a Victor E manifold with a 2" spacer and an adapter to mount the Q-Jet to that spacer. Standard set up. That car of yours belongs in SS. Ed __________________ Ed Carpenter 2005 Chevy Cobalt A/SM Race Engine Development

07-19-2011, 05:10 PM	#5
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: 327/275hp Bore size is all that is checked. I'm pretty sure numbers are not an issue any more on carbs. I've had Wesley check mine a few times and he does it a little different, some times. He uses the points of the calipers on the bore at the throttle shaft. (Better watch, they wear there... I've seen atleast one Comp guy tossed because of the bore being worn past the size limit at that point) Then he has had a go/no go tool he dropped in the main body. He has also used dividers to measure the main body, in several places. One time He had me pull the base plate and measured from the back side of the booster to see if I had oval shaped the bore. Good Tech guys don't miss too much. :~) Sometimes it is safe to get checked beforehand and sealed. Saves you that big OOOPS! It looks like the Q-jet is listed with the same bore sizes for 66 &67 so it should be the same carb for both years. __________________ Adger Smith (Former SS)

07-19-2011, 06:26 PM	#6
Darrin Christen Member Join Date: Mar 2007 Location: Des Allemands, LA Posts: 365 Likes: 8 Liked 1 Time in 1 Post	Re: 327/275hp Thanks for the help guys. __________________ 4878 SS/GA 66CHEVY II