TRIUMPH TR2, TR3, TR4, TR4A, TR5, & TR6 PROFILES

            We recommend having these cams nitrided after grinding because of the wear problems they are known for.  We especially recommend it for the early engines without cam bearings.  The valve lifters are made from soft chilled iron and almost always go bad so it would be best if you sent them along with your cam so we could measure the radius crown height and regrind them.

TAPPET DIAM. TR2, 3, 4 = .936       TR6 = .800      ROCKER RATIO = 1.45:1

 

GRIND NO.

SEAT DURATION

.050 DURATION

CAM LIFT

COLD LASH

APPLICATION

TR 250 STOCK

233

193

.214

I .010

E .010

TR 250 AND SOME EARLY TR 6.

TR2

240

240

188

191

.238

.248

I .010

E .012

STOCK.

TR 6 STOCK

246

245

209

204

.244

.241

I .010

E .010

LATE TR 6.

64.5-12

258

204

.251

I .012

E .014

STREET PERFORMANCE CAM.

TR3 & TR4

264

217

.262

I .010

E .012

STREET PERFORMANCE FOR 6 CYLINDERS.

TR 5 STOCK

269

226

.255

I .010

E .010

STOCK TR 5 WITH LUCAS MK II F.I.

67-18

268

222

.289

I .016

E .018

PERFORMANCE STREET 9:1, SPRINGS, HEADER, 2-5K

70-9

280

228

.262

I .009

E .011

HOT STREET. 9.5:1 MAX W/O CAM BEARINGS.

715-18

286

245

.305

I .020

E .022

HOT STREET. 10:1 SPRINGS, HEADER.

75-12

300

250

.323

I .012

E .014

RACE. 12:1 RACE PREPPED HEAD.

77-9

308

256

.312

I .011

E .013

ROAD RACE.  POWER ABOVE 5,000 RPM.

 

AUTOCROSS AND RACING PROFILES AVAILABLE.  COMPLETE LIST OF ENGINE SPECIFICATIONS REQUIRED.  CALL FOR DETAILS.

 

If you have a car in mind, which is not listed, please call us!