Jeff Ford
February 1, 2004
Photos By: George Ford, Allan Shepley

What does it take to build a monster-a wicked winder that is only fit for the track or some insanely wild street car with no bones about using as much fuel as a battleship and pouring out more horsepower than a Sherman tank? Well, Allan Shepley and Brian Self of Mustang Central (www. mustangcentral.com; 478/956-3871) in Byron, Georgia, were handed that challenge by customer John Scantlin of Nome, Alaska.

This all started because John wants to run a 351 Windsor that has been stroked and poked to 408 cubes in his local drag racing league. He was looking for something in the 700hp range that could deliver the power with stone-cold reliability. After all, it isn't as if John can just drop it back by Allan's place for minor repairs, as they are separated by more than 2,000 land miles.

We'll also say that engines such as this one are not cheap to build. They require bucket trucks full of cash, as well as time and attention to detail. We're not saying you can't build this type of engine-we're just saying it gets expensive, and pro shops like Allan's are sometimes the best route to keep you from having a really expensive explosion.

The Basic BrewWhat John requested and Allan and Brian delivered is a package with set parameters. The engine's sole function is drag racing. It is intended to go fast in a straight line, and, hopefully, to knock the snot out of the other fellows on the scene in Alaska. What John asked for is as follows: 750-800 hp that would turn in excess of 8,000 rpm, run after run. He has no intentions of pushing the V-8 to that extreme, but he wants to know the power is there should he need it.

Only As Strong As Its PartsA well-built engine is only as strong as its weakest parts. Therefore, if you want an engine capable of turning 8,000-plus rpm, you need to build with the best parts. Allan began with the best block the current Ford Racing Performance Parts catalog had to offer for their application-a 351 siamese-bore wet sump block. The bore set on this engine is siamesed to allow for larger bore out. In fact, the Ford catalog states that the block can be safely bored and stroked out to 454 cubes! Our goal is about 46 cubes shy of that.

Dyno Time!We've given you a visual tour of the 408-cube monster. Now it's time for the piston to meet the fuel. Running 116-octane race fuel, the engine had been broken in and made ready. Passes one through six were not super spectacular, but that soon changed. Below is the "baseline" for the final numbers. Here is where Al Moody, our tuner and operator for the day, started out. Al told us "the engine will probably pull about 760 horses." Apparently, Al knows his stuff. Dyno work was done at Barnette Performance in Atlanta; [(404) 522-1320] using a Superflow SF-901 Dynamometer.

Test SevenA Dominator carb was installed, but no advantage was seen in the numbers. Twelve hundred cfm of fuel and air wasn't the solution.

60 degrees F, 29.85 inches barometric pressure

Speed CBTrq CBPwr FHp VE%
rpm lb-ft hp hp  
3,{{{900}}} 489.0 363.1 {{{62}}}.8 104.5
4,000 489.1 372.5 65.7 101.9
4,{{{100}}} 507.9 396.5 68.6 101.4
4,{{{200}}} 494.0 395.0 71.6 100.0
4,{{{300}}} 497.3 407.2 74.7 98.3
4,400 518.0 434.0 77.7 97.2
4,500 547.1 468.8 {{{80}}}.9 106.1
4,{{{600}}} 550.3 482.0 84.1 109.3
4,700 555.1 496.8 87.3 111.1
4,800 561.5 513.2 {{{90}}}.8 109.1
4,{{{900}}} 561.6 524.0 94.1 109.1
5,000 560.6 533.7 97.6 108.8
5,{{{100}}} 565.4 549.0 101.1 110.9
5,{{{200}}} 567.5 561.9 104.8 113.0
5,{{{300}}} 566.7 571.9 108.8 109.6
5,400 564.7 580.6 113.3 110.3
5,500 567.3 594.1 118.0 112.3
5,600 569.5 607.2 122.7 111.4
5,700 565.0 613.2 127.5 110.9
5,800 571.3 630.9 132.5 113.7
5,900 568.9 639.1 137.5 112.8
6,000 571.6 653.0 142.6 116.6
6,100 575.5 668.4 148.8 114.9
6,200 571.6 674.8 155.0 115.8
6,300 571.2 685.2 161.5 114.1
6,400 569.3 693.7 168.0 113.4
6,500 562.8 696.5 174.6 114.3
6,600 557.2 700.2 181.3 113.8
6,700 550.0 701.6 188.3 115.0
6,800 541.9 701.6 195.4 114.3
6,900 534.3 702.0 203.0 112.9
7,000 534.7 712.7 210.6 111.9
7,100 535.9 724.5 218.3 112.2
7,200 528.4 724.5 226.2 112.8
7,300 526.0 731.1 234.3 112.3
7,400 515.8 726.8 242.5 110.3
7,500 517.2 738.6 250.8 113.1

Test EightAl reinstalled the DaVinci carb, plugged the rear power valve, and installed 90-series jets.

60 degrees F, 29.90 inches barometric pressure

Speed CBTrq CBPwr FHp VE%
rpm lb-ft hp hp  
4,{{{100}}} 507.9 396.5 68.6 274.8
4,{{{200}}} 506.5 {{{405}}}.0 71.6 275.1
4,{{{300}}} 514.4 421.2 74.7 278.3
4,400 527.4 441.8 77.7 286.4
4,500 545.1 467.1 {{{80}}}.9 292.7
4,{{{600}}} 553.5 484.8 84.1 303.0
4,700 564.5 {{{505}}}.2 87.3 313.3
4,800 571.3 522.1 {{{90}}}.8 324.3
4,{{{900}}} 569.9 531.7 94.1 326.5
5,000 579.6 551.8 97.6 341.3
5,100 586.5 569.5 101.1 337.8
5,200 587.1 581.3 104.8 341.6
5,300 588.3 593.7 108.8 338.2
5,400 586.8 603.3 113.3 344.5
5,500 583.7 611.3 118.0 340.2
5,600 582.9 621.5 122.7 344.1
5,700 578.3 627.6 127.5 349.6
5,800 575.3 635.3 132.5 352.0
5,900 577.7 649.0 137.5 357.9
6,000 579.4 661.9 142.6 354.8
6,100 579.2 672.7 148.8 351.9
6,{{{200}}} 579.4 684.0 155.0 346.5
6,{{{300}}} 581.2 697.2 161.5 348.7
6,400 578.2 704.6 168.0 347.1
6,500 576.9 714.0 174.6 347.7
6,{{{600}}} 572.1 718.9 181.3 348.0
6,700 564.5 {{{720}}}.1 188.3 351.0
6,800 560.1 725.2 195.4 351.4
6,{{{900}}} 554.6 728.6 203.0 359.9
7,000 546.0 727.7 210.6 360.6
7,{{{100}}} 535.3 723.7 218.3 354.5
7,200 537.1 736.3 226.2 349.6
7,300 530.6 737.5 234.3 347.3
7,400 521.5 734.8 242.5 344.6
7,500 523.2 747.1 250.8 351.7
7,600 511.0 739.5 259.6 340.2

Test NineNext on the trail of higher numbers was an open, 2-inch phenolic spacer in place of the four-holer.

60 degrees F, 29.85 inches barometric pressure

Speed CBTrq CBPwr FHp VE%
rpm lb-ft hp hp
4,000 508.0 386.9 65.7 283.0
4,{{{100}}} 502.4 392.2 68.6 277.4
4,{{{200}}} 510.2 408.0 71.6 275.8
4,{{{300}}} 511.4 418.7 74.7 276.2
4,400 519.8 435.5 77.7 283.8
4,500 536.4 459.6 {{{80}}}.9 289.4
4,{{{600}}} 550.5 482.2 84.1 301.8
4,700 557.8 499.2 87.3 315.3
4,800 564.1 515.6 {{{90}}}.8 325.3
4,{{{900}}} 567.8 529.7 94.1 333.0
5,000 575.8 548.2 97.6 337.6
5,100 577.3 560.6 101.1 338.2
5,200 585.2 579.4 104.8 338.5
5,300 584.4 589.7 108.8 339.4
5,400 583.0 599.4 113.3 339.1
5,500 578.0 605.3 118.0 334.5
5,600 577.6 615.9 122.7 335.6
5,700 576.7 666.4 148.8 353.9
5,800 572.6 632.3 132.5 334.5
5,900 574.9 645.8 137.5 336.1
6,000 577.6 659.9 142.6 340.9
6,100 573.8 666.4 148.8 353.9
6,200 574.5 678.2 155.0 355.1
6,300 578.4 693.8 161.5 360.9
6,400 576.0 701.9 168.0 363.6
6,500 571.5 707.3 174.6 361.0
6,600 569.7 715.9 181.3 354.9
6,700 557.8 711.6 188.3 348.6
6,800 554.9 718.5 195.4 343.5
6,900 550.7 723.5 203.0 351.9
7,000 547.8 730.1 210.6 352.1
7,100 538.7 728.3 218.3 346.2
7,200 535.8 734.5 226.2 347.8
7,300 529.3 735.7 234.3 347.1
7,400 526.9 742.4 242.5 348.1
7,500 515.1 735.6 250.8 346.1
7,600 512.3 741.3 259.6 341.0

Test TenStill in search of more power, Al decides to move the trigger for the crank from 35 to 38 degrees.

60 degrees F, 29.89 inches barometric pressure

Speed CBTrq CBPwr FHp VE%
rpm lb-ft hp hp  
4,{{{100}}} 501.9 391.8 68.6 282.8
4,{{{200}}} 503.0 402.2 71.6 283.3
4,{{{300}}} 503.1 411.9 74.7 280.8
4,400 508.4 425.9 77.7 286.3
4,500 533.4 457.0 {{{80}}}.9 303.3
4,{{{600}}} 535.6 469.1 84.1 307.1
4,700 552.4 494.3 87.3 319.7
4,800 550.9 503.5 {{{90}}}.8 313.1
4,{{{900}}} 556.8 519.5 94.1 320.0
5,000 564.6 537.5 97.6 322.4
5,100 569.4 552.9 101.1 330.9
5,200 576.9 571.2 104.8 338.6
5,300 574.9 580.2 108.8 332.0
5,400 577.8 594.1 113.3 333.5
5,500 574.8 601.9 118.0 331.8
5,600 569.3 607.0 122.7 339.2
5,700 568.9 617.4 127.5 339.1
5,800 571.1 630.7 132.5 339.4
5,900 569.2 639.4 137.5 344.4
6,000 567.2 648.0 142.6 344.3
6,100 568.0 659.7 148.8 348.4
6,200 569.3 672.1 155.0 348.9
6,300 570.0 683.7 161.5 348.9
6,400 571.8 696.8 168.0 347.4
6,500 565.7 700.1 174.6 351.6
6,600 558.2 701.5 181.3 352.3
6,700 551.0 702.9 188.3 352.9
6,800 541.9 701.6 195.4 350.3
6,900 536.5 704.8 203.0 349.9
7,000 535.1 713.2 210.6 343.7
7,100 533.7 721.5 218.3 341.6
7,200 528.3 724.2 226.2 342.4
7,300 518.8 721.1 234.3 345.9

Test ElevenWith a final move of the crank trigger to 32 degrees, we get our numbers. Al confesses there is more to be had, but 748 hp is as far as he is willing to go in search of numbers on an engine bound for the drags.

60 degrees F, 29.88 inches barometric pressure

Speed CBTrq CBPwr FHp VE%
rpm lb-ft hp hp
4,000 519.1 395.4 65.7 273.7
4,{{{100}}} 509.7 397.9 68.6 265.4
4,{{{200}}} 511.9 409.4 71.6 271.2
4,{{{300}}} 510.9 418.3 74.7 271.1
4,400 512.1 429.0 77.7 269.2
4,500 529.8 453.9 {{{80}}}.9 279.1
4,{{{600}}} 549.2 481.0 84.1 289.7
4,700 559.2 500.4 87.3 302.3
4,800 562.9 514.5 {{{90}}}.8 306.0
4,{{{900}}} 567.7 529.7 94.1 315.4
5,000 572.5 545.0 97.6 325.9
5,100 575.7 559.0 101.1 333.5
5,200 585.3 579.5 104.8 329.6
5,300 585.4 590.8 108.8 332.7
5,400 585.2 601.7 113.3 337.0
5,500 584.4 612.0 118.0 334.5
5,600 585.5 624.3 122.7 334.7
5,700 584.7 634.6 127.5 336.8
5,800 582.7 643.5 132.5 335.1
5,900 580.7 652.3 137.5 338.6
6,000 582.0 664.9 142.6 343.1
6,100 580.2 673.9 148.8 346.0
6,200 578.8 683.3 155.0 347.9
6,300 580.0 695.7 161.5 350.1
6,400 578.7 705.2 168.0 352.8
6,500 578.3 715.7 174.6 352.7
6,600 573.3 {{{720}}}.4 181.3 355.1
6,700 566.7 722.9 188.3 350.0
6,800 562.1 727.8 195.4 346.1
6,900 550.8 723.6 203.0 347.0
7,000 549.6 732.5 210.6 345.4
7,100 540.4 730.5 218.3 348.1
7,200 536.1 734.9 226.2 344.8
7,300 532.3 739.9 234.3 348.8
7,400 521.2 734.4 242.5 352.3
7,500 516.8 738.0 250.8 345.9
7,600 517.0 748.1 259.6 339.3

Crank SpecsScat Crankshafts www.scatcrankshafts.com(310) 370-5501* Pro Comp crankshaft PN 8-351-4000-PC* Leading knife trailing Edge counterweight* Lightening holes in all throws* Any stroke or rod combination* Ion nitride hardening* Center counterweights available

Rod SpecsGRP Connecting Rods www.grpconrods.com(303)935-7565* 1200-series rod* 71/416 ARP bolt * .927 or .990 wristpin* 2.125 - 2.225 housing bore* 6.20 rod length* JE Pistons tool-steel full-floating wristpins PN 927-2750-18

PistonsJE Pistonswww.jepistons.com(714) 898-9763* Sportsman Racing piston PN 206063* Bore size 4.030* Forged from 4032 low-expansion high-silicon aluminum* Heat treated* CNC-machined ring groves* Includes wristpins* Rings PN J100F8-4030-5

Valves* 2.125 intake and 1.625 exhaust Titanium supplied by builder

SpringsComp Camswww.compcams.com(800) 999-0853

PushrodsComp Camswww.compcams.com(800) 999-0853* 31/48-inch diameter pushrods PN 7908-16* 8.80-inch length

CamComp Camswww.compcams.com(800) 999-0853* Custom-grind PN 35-000-9 (serial number 4439)* Specs are for a cam installed at 108-degrees intake centerline* Duration at .050 274 (intake) 282 (exhaust)* Lobe lift .4620 (intake) .4400 (exhaust)* Lobe separation 112.0 degrees

Timing ChainComp Cams www.compcams.com(800) 999-0853* Double-roller timing-chain set PN 3135KT

DamperATI Performance Products www.atiperformanceproducts.com (800) 284-3433* 6.325 aluminum shell damper PN918923* Total weight 3.90 pounds, inertia weight 2.40 pounds