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6 Small Block Ford Cylinder Heads That Work

Bolt-On Power For Less Than $1,350

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Peaks and Averages
We should stress that during testing we optimized each set of heads for timing and jetting and then ran the engine with two near identical runs, which were then averaged to come up with the final power numbers. While peak horsepower is a quick evaluator, we prefer to use average power in these comparisons because it always produces a better picture of overall performance. But as we've seen before, the heads that produce the best peak power also do so throughout the entire rpm band. That's what the TFS Twisted Wedge heads did. Not only did the TFS heads produce the most peak power but also the best average torque and horsepower. The RHS heads produced the next closest average horsepower and torque, with the Edelbrock and Ford heads very close behind. The power numbers are so close that if we had tested these heads in a typical street car, it's doubtful we would have seen much of a difference in performance among the middle four heads. Throw a blue oval flag over the RHS, Edelbrock, and Ford heads, and the performance is very similar.

We certainly don't want to ignore the peak numbers, and that's where the TFS Twisted Wedge heads really earned the spotlight. The TFS heads made an honest 380 hp, but what we found surprising was how well the Edelbrock E-Street head did with a peak of 371, substantially better than Ford Racing's 362hp Third Place finish. The finish order for peak torque realigned slightly with TFS out front, RHS coming in a strong Second, with Edelbrock and Ford tied for Third.

Average Power

Avg. TQ Avg. HP
TFS 341.4 294.3
RHS 335.8 288.8
Edelbrock 332.5 286.2
Ford 332.3 285.4
Flo-Tek 330.5 283.1
World 327.1 280.7

Power Chart
Test 1 (TQ1/HP1): World Windsor, Jr.
Test 2 (TQ2/HP2): Edelbrock E-Street
Test 3 (TQ3/HP3): Flo-Tek / Speedway Motors
Test 4 (TQ4/HP4): Ford Racing
Test 5 (TQ5/HP5): Racing Head Service
Test 6 (TQ6/HP6): Trick Flow Specialties Twisted Wedge

RPM TQ1 HP1 TQ2 HP2 TQ3 HP3 TQ4 HP4 TQ5 HP5 TQ6 HP6
3,000 311 177 312 178 314 180 312 178 309 176 312 178
3,200 306 187 312 190 317 193 314 191 313 191 313 191
3,400 310 201 311 201 321 208 318 206 321 207 318 206
3,600 325 223 320 219 329 225 327 224 329 225 330 226
3,800 329 238 326 236 333 241 331 240 332 240 335 242
4,000 332 253 332 253 336 256 334 255 337 257 339 258
4,200 337 269 339 271 341 272 338 271 343 274 345 276
4,400 342 287 346 290 346 290 345 289 350 294 353 296
4,600 341 298 345 302 347 304 346 303 351 308 356 312
4,800 337 308 344 314 343 314 344 314 349 319 357 326
5,000 335 319 343 326 339 323 342 326 347 331 357 340
5,200 334 331 344 341 336 333 340 337 347 343 355 351
5,400 332 341 344 354 333 342 339 348 345 355 353 363
5,600 326 347 340 362 326 347 333 355 339 362 350 374
5,800 317 350 331 366 315 348 325 359 329 364 343 379
6,000 308 352 322 368 297 340 316 361 317 362 333 380
6,200 --- --- 314 371 --- --- 307 362 --- --- 320 378
Peak 342 352 346 371 347 349 346 362 352 364 357 380
Avg. 327.1 280.7 332.5 286.2 330.5 283.1 332.3 285.4 335.8 288.8 341.4 294.3

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12 comments
Fanny St-jacque
Fanny St-jacque

quand tu va voir live un moteur sur le DYNO t en a des frissons sur tout le corps de l entendre révolutionner (super exp je le souhaite a tout les amateurs de char modifiés)

Darren Rabaduex
Darren Rabaduex

Mike Lewin, its a little late now, but the twisted wedge 180 made more power across the board out of all 6 of the heads they tested. RHS is in the list too. Zach Endicott, your Windsor Jrs are in there too.

Kurt Trimas
Kurt Trimas

Checking valve clearance, because it doesn't seem like spring tension

Jeff Mcdowell
Jeff Mcdowell

That was a lot of work to test tiny heads. What about Vic jr's and others?

Toby Waters
Toby Waters

And when all that fails.... LS it. :p

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