Thread: 1967 chevelle ss with a 327 with a 3959512 casting number

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I haven't had much success finding out very much info on this engine. For the most part I believe it is stock. There is a holley 650 cfm double pumper 4777-2 and a weiand mid rise intake on it. I'm curious as to what I should do to this engine (headers, heads, cam etc) just to add HP because I don't drive this car except to have fun. Thanks.IMG_20150119_165304.jpg

Fairly heavy car, needs cubic inches to really have fun. Build a 383 or 406 for it.

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Welcome to CHR! Nice Chevelle! Like techinspector1 says it's not a lightweight, so it really depends on how much you want to spend, and how much fun you're talking about. You'll probably get a bit of noticeable performance increase from a set of good headers made specifically for your setup, one of the old line main brands, but before I put very much money into the 327 I'd look at boosting the engine size, or even going to a later model takeout engine, tranny and electronics from a newer Camaro or ??? The old adage is even more true today...

Speed Is Money, How Fast Do You Want To Go?

Save the 327 for something else or sell it to someone doing a restoration. 350 blocks are easy to come by, and 383 rotating assemblies can be had for a very good price. And with the additional cubic inches, you don't need a big cam to produce hp and torque. You will love driving your Chevelle with a 383 under the hood. The same goes for a 406, but good 400 blocks are getting hard to find.