PROJECT 632 PART 6:DELIVERANCE With assembly complete, it was time to light the candle. by Mike Mavrigian all photos by author Well, the motor was final-assembled and run on the dyno. Although we didn’t hit our hoped-for 1,200 horsepower, we did manage a 1,115 horsepower run. With further tuning, we know the potential is there. [...]
The upper intake manifold plenum box gasket is stainless-steel reinforced and provided a perfect fit. The upper plenum box is secured with 1/4″ x 20 x 3/4″ stainless socket head cap screws. I applied a dab of moly to the threads prior to installation. I tightened all screws to 60 in-lbs using a criss-cross pattern. [...]
Using my Goodson 1.8″ – 2.6″ valve spring height gauge, we set final spring installed height at 2.150″. The original valve guides protruded a tad too high for adequate retainer-to-guide-seal clearance. Using a 1/2″ guide cutter and an 11/32″ pilot, I cut the guides down by 0.147″. During intake manifold and gasket test fitting, I [...]
Our chromoly Manton pushrods feature extended lifter tips and hardened rocker tips. Our order consisted of three different lengths. All exhaust pushrods are 1/2” diameter x 11.124”, while intakes were 7/16” tapered in lengths of 10.953” and 10.805”. Here you can clearly see the length differences. From left to right: 11.124” exhaust pushrod, 10.953” intake [...]
WATER PUMP Installing the Meziere Enterprises electric water pump P/N wp300 was a breeze. With gaskets lightly coated with UltraCopper RTV, I snugged the four ARP 3/8″ x 16 x 1.250″ stainless bolts to a specified value of 25 ft-lbs (Meziere supplies socket head cap screws, but I opted for the ARP polished stainless just [...]
CLAMPING OUR HEADS Using ARP moly lube on our stud threads and nuts (and on both sides of each washer), all nuts were tightened to a value of 65 ft-lbs, with the exception of the four special inboard (lifter valley side) studs, which were tightened to 45 ft-lbs. Note: Because the four lower outboard studs [...]
632 Part 5: THE ASSEMBLY CONTINUES by Mike Mavrigian photos by author In this article installment, we deal with a few minor challenges during the final fitting phase, but nothing too daunting. The details are provided here PUSHRODS In order to handle the demands of this engine, I ordered a set of extra-beefy custom pushrods [...]
The fuel pump pushrod inserts through the hole below the main pump mounting passage. The phenolic spacer requires a thin film of RTV on both sides. Rubber sealing washers are placed over the pushrod base. Race Pumps notes that you can use only the number required for a good seal (1, 2 or all 3). [...]
JESEL SHAFT ROCKER SYSTEM Our rocker system is Jesel’s shaft roller setup, P/N KPS 24347, featuring a very healthy 1.85:1 rocker arm ratio. The first order of business is to install the rocker stands. Each head requires one long stand, positioned across the upper, inboard area of the rocker galley, in addition to four individual [...]
LIFTERS Cyl. No. Lifter cup orientation (per lifter pair) 1-close together 2-far apart 3-far apart 4-close together 5-close together 6-far apart 7-far apart 8-close together Our mechanical roller lifters are Crane’s offset Ultra Pro R/T lifters, P/N 13571-16. With the lifters soaked with 30W oil, these were slid into the lifter bores. Because of the [...]
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