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Ford Stock-Block Stroker Engine Swap Part 2

351 Stock Block Stroke Swap Pt 2 Front View
By our third pull, we had... 
   
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351 Stock Block Stroke Swap Pt 2 Front View
By our third pull, we had things pretty dialed in, and the engine produced 396.7 hp and 377 lb-ft of torque. Average torque and horsepower was up as well.
351 Stock Block Stroke Swap Pt 2 Front View
After the engine dyno's break-in... 
   
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351 Stock Block Stroke Swap Pt 2 Front View
After the engine dyno's break-in program was complete, Hedrick made a few half-throttle pulls to creep up on the engine. Oil pressure and temperature, along with the air/fuel ratio was carefully watched to make sure we didn't toast our fresh motor. Our first pull, with 29 degrees of total timing, netted a peak horsepower of 390.4 at 5,500 rpm and peak torque of 378.1 lb-ft at 5,000 rpm.
351 Stock Block Stroke Swap Pt 2 Front View
The first thing we did was... 
   
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351 Stock Block Stroke Swap Pt 2 Front View
The first thing we did was check the base timing, which we had set at 10 degrees. We saw the timing changing upwards of 10 degrees while the engine was idling. Something was amiss.
351 Stock Block Stroke Swap Pt 2 Front View
On our fourth pull, we detected... 
   
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351 Stock Block Stroke Swap Pt 2 Front View
On our fourth pull, we detected a slight engine misfire, and the dyno chart showed the engine's dismay. Note how power and torque dropped off at 5,600 rpm.
351 Stock Block Stroke Swap Pt 2 Front View
After changing out spark plugs,... 
   
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351 Stock Block Stroke Swap Pt 2 Front View
After changing out spark plugs, distributors, computers, and ignition modules, we began to perform several mechanical tests, including compression and leak down tests. Everything checked out fine, so we went back to the ignition timing and its erratic movement. We decided to remove the fuel injection and install a carbureted-induction setup to rule out the wiring harness. As we pulled apart the engine, we discovered that the camshaft was moving a good bit in the block, which disrupts the mesh of the distributor gear against the cam gear. Unfortunately, we could not reassemble and retest the engine before we met our deadline, so be sure to check back in the next installment as we'll compare the carbureted setup against the EFI and finish our tuning and engine dyno testing.
Trick Flow Specialties
330/630-1555

www.trickflow.com
Ford Racing Performance Parts
44050 N. Groesbeck Hwy.
Clinton Township
MI  48036-1108
(810) 468-1356

www.fordracing.com/performancepa
rts
Summit Racing Equipment
800/230-3030

summitracing.com
Competition Products
Oshkosh
WI
920/233-2023

Competitionproducts.Com
Horsepower By Hedrick
904/771-2739
Brothers Performance Warehouse
(951) 735-8880

www.brothersperformance.com
HP Performance Inc.
329 Parkridge Ave., Ste. 6
Orange Park
FL  32065
904/276-7223

www.hp-performance.com
Aeromotive Inc.
7805 Barton St.
Lenexa
KS  66214
913/647-7300

www.aeromotiveinc.com

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351 Stock Block Stroke Swap Pt 2 Front View 351 Stock Block Stroke Swap Pt 2 Front View
351 Stock Block Stroke Swap Pt 2 Front View 351 Stock Block Stroke Swap Pt 2 Front View
 
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