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**The Rocknrod** · 11-22-2018, 08:00 AM

I'm looking at these two engines for my 64 stepside. Slight differences but one (ATK) has a 4 bolt mains and the other (Blueprint) has 2 bolt mains. Heads are a bit different. I am using an 11" brake booster and am concerned about vacuum so I am leaning toward ATK. Both have roller lifters, vortec heads, one piece rear mains and can use a mechanical fuel pump. Blueprint says they dyno theirs. ATK does not however. This could be an issue also, since now I'm reading feedback from other forums less favorable to ATK.
Whats your take?
1. http://www.high-performance-engines....0hp-p/hp32.htm

2. https://blueprintengines.com/collect...lock-bp3503ct1

11-22-2018, 08:00 AM	#1
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Blueprint vs ATK Engines I'm looking at these two engines for my 64 stepside. Slight differences but one (ATK) has a 4 bolt mains and the other (Blueprint) has 2 bolt mains. Heads are a bit different. I am using an 11" brake booster and am concerned about vacuum so I am leaning toward ATK. Both have roller lifters, vortec heads, one piece rear mains and can use a mechanical fuel pump. Blueprint says they dyno theirs. ATK does not however. This could be an issue also, since now I'm reading feedback from other forums less favorable to ATK. Whats your take? 1. http://www.high-performance-engines....0hp-p/hp32.htm 2. https://blueprintengines.com/collect...lock-bp3503ct1 __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 11-22-2018 at 08:33 AM.