Hi all,

I've found many references to the stock cast iron intake for 66 396/325hp engine but they all show this is for a holley carb.

My engine has the IVR suffix which denotes a 4bbl rochester instead of the holley.

Can someone tell me if the 3866948 cast intake would be the stock one or was there another intake for the rochester application.

Thank you very much.
Gary,

OK NO PROBLEM...i've found the numbers.

intake for rochester - 3883948
intake for holley - 3866948

Glad you found the numbers for the intakes. I thought I would mention that the IVR suffix is for an engine out of a Full size Chevrolet and it appears that both IVR with the Rochester, and IVH with the Holley, were both common on the full size. That is not the case with the Chevelle, however. Most 325HP SS396 Chevelles and El Caminos used the Holley intakes and manifolds. Only the California versions of the 325HP engines with smog pumps used the Rochester Quadrajets in the Chevelles. So if you are doing a restoration of a Fremont built car you could use the Rochester, but if you are restoring one built at any of the other Chevelle assembly plants, a Holley would be correct.

Glad you found the numbers for the intakes. I thought I would mention that the IVR suffix is for an engine out of a Full size Chevrolet and it appears that both IVR with the Rochester, and IVH with the Holley, were both common on the full size. That is not the case with the Chevelle, however. Most 325HP SS396 Chevelles and El Caminos used the Holley intakes and manifolds. Only the California versions of the 325HP engines with smog pumps used the Rochester Quadrajets in the Chevelles. So if you are doing a restoration of a Fremont built car you could use the Rochester, but if you are restoring one built at any of the other Chevelle assembly plants, a Holley would be correct.

Hi AZCamino, i'm having a debate with myself about which way to go.
I couldn't hold out any longer waiting for a correct 68 chevelle casting 323 or 440 block for a low price so i purchased this 66 396 IVR engine for $1000 CAD. It has a C-396 edelbrock intake on it at the moment with a holley 600 which i know is not stock but it's a solid engine which has not been bored or modified and was only 15 minutes from where i live. I guess it makes more sense to go with the holley since you've made me aware of this. At least when/if i come up with a proper cast block i would be one step further. Thanks for the info!

Cheers,
Gary

Hi AZCamino, i'm having a debate with myself about which way to go.
I couldn't hold out any longer waiting for a correct 68 chevelle casting 323 or 440 block for a low price so i purchased this 66 396 IVR engine for $1000 CAD. It has a C-396 edelbrock intake on it at the moment with a holley 600 which i know is not stock but it's a solid engine which has not been bored or modified and was only 15 minutes from where i live. I guess it makes more sense to go with the holley since you've made me aware of this. At least when/if i come up with a proper cast block i would be one step further. Thanks for the info!

Cheers,
Gary

Gary,
The information I gave was for 66, per the title of the post. In 1968, all of the 325HP 396s and the 350HP 396s used Rochester Quadrajets. However, the 66/67 Qjet manifold was different than the 68 and later. The 68 intake doesn't have a temperature sensor and it may be lower in height. The temperature sensor is in the heads starting in 68. The earlier engine will fit fine in the later car, you will just need to relocate/lengthen the temp sensor wire. The earlier engine also requires a grooved rear cam journal, so if you do any cam swapping make sure you have the new cam modified with a grooved journal.

You better get some input from the 68 owners on this one if you want to look for a correct casting number intake for the 68. Of course, a correct number intake will require a later set of heads with holes for the temperature sender.