The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

harpo231 · 03-13-2018, 01:21 PM

On the L31 Vortec heads, the exhaust ports are not centered on the bolt holes. This results in a mismatch of the exhaust ports of the heads with any manifold or header other than the L31 manifolds. Really not sure why GM did this.

03-13-2018, 01:21 PM	#2
harpo231 Registered User Join Date: Nov 2014 Location: Lincoln City DE Posts: 1,292	Re: L31 Vortec 350 On the L31 Vortec heads, the exhaust ports are not centered on the bolt holes. This results in a mismatch of the exhaust ports of the heads with any manifold or header other than the L31 manifolds. Really not sure why GM did this. __________________ Stan 67 swb BLU MULE posted via flip-fone