Vortek heads on a 327

Question

How much does it raise the compression putting vortek heads on a 327? Any pro or cons on doing this?

Answer 1

The L31 Vortec heads have 64 cc combustion chambers.  The change in compression would depend on which heads are currently on your 327.  327's were built with numerous different casting heads with chamber volumes ranging from 60cc to 75cc including 64cc, so it could raise, drop, or stay the same.  

The L31 Vortec heads outflow every previous small block Chevrolet production head including the legendary 492 LT1 heads.  As mentioned you will have to use a Vortec specific intake manifold.  You also must use self aligning rocker arms.  The stock springs in the Vortec heads are also limited to .450 lift before coil bind.

Answer 2

not too shore but you will need to get a intake from edelbrock to make it wrok vorteks have a difernt digrey then old school GM,s good luck.

Answer 3

The vortek has to do with the intake manifold, not the heads.  Putting heads off a vortek would actually lower compression not raise it.  The 327 operated in a leaded fuel enviornment, not the unleaded/ethanol junk we buy today so compressions have to be lower to avoid knock.

Answer 4

easy to do .. change or order a set with smaller chambers.. thats the easy part... now you'll need to check for valve to piston clearances..then the fun begins !!!! pistons and such... try finding out what cc's your chambers are then find which set of head you can use with your pistons not being replaced.. you may already have small cc heads on this motor .. get the number out of the middle of the heads between the rocker arms and run them on the mortec site .. it will tell you what you have , the year made, valve sizes, and the cc's.... easy... vortec heads are good for more horsepower if done right ... they are very different then the old heads.. not just the manifold-- which you will have to change too..   ralphy is right on the other things tho..