AUSTIN HEALY SPRITE, MG MIDGET, AND MINI PROFILES

A SERIES 848-1275cc ENGINES.   TAPPET DIAM.  = .812   STD ROCKER RATIO = 1.25:1   BMC A SERIES CAMS ARE 5 DEGREES RETARDED FROM THE FACTORY.  OFFSET KEYS REQUIRED TO CHANGE CAM TIMING.  NITRIDING STRONGLY RECOMMENDED FOR ALL BMC RACING CAMS.

 

GRIND NO.

SEAT DURATION

.050 DURATION

CAM LIFT

LASH

APPLICATION

66-15

264

217

.262

I .015

E .017

ONE STEP UP FROM STOCK.

67-18

268

222

.289

I .018

E .020

1275-NEEDS PERFORMANCE SPRINGS

685-16

274

230

.295

I .016

E .018

SPRINGS & PORTED HEAD RECOMMENDED.

70-9

280

228

.263

I .009

E .011

HOT STREET 9:1, SPRINGS & HEADER.

70-10

280

228

.278

I .010

E .012

HOT STREET 9:1. SPRINGS, HEADER, REWORKED HEAD.

71-15

284

235

.290

I .015

E .017

AUTOCROSS 9.5:1 SPRINGS, GOOD HEAD, & WEBER.

715-18

286

242

.302

I .017

E .019

AUTOCROSS 10:1

SAME AS ABOVE.

72-10

288

235

.290

I .011

E .013

AUTOCROSS 10.5:1

SAME AS ABOVE.

75-15

300

250

.297

I .014

E .016

RACE GRIND. 11+:1

SAME AS ABOVE.

75-12

300

250

.323

I .013

E .015

RACE GRIND. REQUIRES BETTER HEAD THAN ABOVE.

M77-13

308

255

.321

I .014

E .016

FULL RACE APPLICATION 45-7500 RPM. 12+:1

765-14

306

261

.341

I .014

E .016

RACE. 12.5:1 REQUIRED

77-12

 

308

263

.348

I .014

E .016

RACE 13:1 MAX FOR PREPARED 948cc, MUST DYNO TUNE.

775-18

 

310

268

.380

I .022

E .024

RACE. WORKS BEST FOR 1275-1440cc ENGINES.

WE RECOMMEND NITRIDING ALL BMC CAMS.  

 

 

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