The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1974-454 What "Mark" do I have?

franken · 10-21-2020, 04:13 AM

The Mark IV is what we think of as the big block after the W-head engines ~65/66 and up to about 90.

10-21-2020, 04:13 AM	#2
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,052	Re: 1974-454 What "Mark" do I have? The Mark IV is what we think of as the big block after the W-head engines ~65/66 and up to about 90.