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!