Hi Flow Cast Iron Exhaust Manifolds - Anyone produce them? Check this article out
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Joined: Jun 2015
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From: Austin, TX
Car: 90 Formula / T-tops
Engine: 305 TPI
Transmission: MD8
Hi Flow Cast Iron Exhaust Manifolds - Anyone produce them? Check this article out
http://www.hotrod.com/how-to/engine/...-vs-manifolds/
389 Tri-Power Dyno Results Part Peak HP/RPM Peak Torque/RPM Avg. HP Avg. Torque
Hedman Long-Tube 367 at 5,400 407 at 4,350 355 382
Perf. Years Ram-Air 355 at 5,300 400 at 4,400 346 372
Log manifolds 347 at 5,300 395 at 4,350 339 364
Hedman Shorty 342 at 5,300 386 at 4,350 333 357
389 Tri-Power Dyno Results Part Peak HP/RPM Peak Torque/RPM Avg. HP Avg. Torque
Hedman Long-Tube 367 at 5,400 407 at 4,350 355 382
Perf. Years Ram-Air 355 at 5,300 400 at 4,400 346 372
Log manifolds 347 at 5,300 395 at 4,350 339 364
Hedman Shorty 342 at 5,300 386 at 4,350 333 357
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