BigBlock Cams (Ultradyne)

Ultradyne Cams camshafts

The information and pages posted below were found in the internet-archive.org and are purely for historical purposes only.

383-440 B/RB Ultradyne Cams
HYDRAULIC FLAT TAPPET

*HYDRAULIC FLAT TAPPET CAMSHAFTS* (NOT LEGAL FOR STREET USE IN CALIFORNIA) *NOTE: Specify 1-bolt or 3-bolt core. They are interchangeable when the 3-bolt is used with the Hemi timing gear. We recommend the 3-bolt for all high performance applications.*
DURATION AT SEAT IN/EX	LOBE SEPARATION	GROSS VALVE LIFT IN/EX	DURATION AT .050" IN/EX	TYPICAL APPLICATIONS	POWER RANGE
262/272	112	.432/.454	207/217	Excellent in heavy passenger cars, smooth idle, good power.	Idle-5000
272/272	112	.454/.454	217/217	Best choice for passenger cars, tow trucks and mobile homes. Good idle, power and economy. Works with stock parts.	Idle-5500
276/286	112	.454/.454	221/230	Good performance street cam, pickups, off-road truck pullers, etc.	Idle-6000
288/296	108	.485/.507	231/239	Hot street or bracket car, 3000+ converter, 4.10+ gears.	2800-6500
304/312	108	.530/.551	247/255	Brackets only, 4200 converter, 4.56+ gears.	4000-7000
312/320	108	.551/.557	255/263	Light bracket cars, 4-speeds or 5000+ converter.	4500-8000

383-440 B/RB Ultradyne Cams
MECHANICAL FLAT TAPPET

*MECHANICAL FLAT TAPPET CAMSHAFTS* (NOT LEGAL FOR STREET USE IN CALIFORNIA) *NOTE: Specify 1-bolt or 3-bolt core. They are interchangeable when the 3-bolt is used with the Hemi timing gear. We recommend the 3-bolt for all high performance applications.*
DURATION AT SEAT IN/EX	LOBE SEPARATION	GROSS VALVE LIFT IN/EX	DURATION AT .050" IN/EX	TYPICAL APPLICATIONS	POWER RANGE
270/270	110	.548/.548	243/243	Our version of the ‘Purple shaft’, with more power everywhere.	2000-6200
278/278	108	.570/.570	251/251	Hot street or heavy bracket car, 3500+ converter or 4-speed. 451 with SR heads had 605 HP @ 6200 RPM.	2000-6200
280/280	110	.557/.557 (.594/.594-1.6)	251/251	Excellent hot street cam with 1.5s. Use with 1.6s and 108 LSA as bracket cam.	2500-6500
282/282	108	.582/.582	255/255	Heavy bracket cars, 3500+ converter.	3000-6800
284/284	108	.568/.568 (.606/.606-1.6)	255/255	Great in 451s with 1.6 rockers, 3500+ SS.	3000-7000
286/286	108	.587/.587	259/259	For heavier dual-purpose cars, 4000 SS	3500-7200
290/290	108	.597/.597	263/263	383-440s, under 3500 lbs, 4000 SS	3800-7200
294/294	108	.609/.609	267/267	383-440s, under 3200 lbs, 4000 SS.	4000-7500
301/309	108	.591/.613 (.630/.654-1.6)	268/276	Heavy bracket cars, 4200+ converter.	3800-7200
309/309	108	.613/.613 (.654/.654-1.6)	276/276	Bracket cars under 3300 lbs., 5000 converter or heavy 4-speed drag car.	4200-7500
304/304	108	.640/.640	277/277	Drag cars under 2800 lbs., 5000 converter or 4-speed.	4800-8500
304/317	110	.640/.635	277/284	500+ CID engines, light cars, 5000 SS or Lenco.	4500-8000
313/317	110	.624/.635 (.666-1.6s, int only)	280/284	Large CID engines, dragsters. 5500 SS or Lenco.	4500-8000

383-440 B/RB Ultradyne Cams
MECHANICAL ROLLER TAPPET

*MECHANICAL ROLLER TAPPET CAMSHAFTS* (NOT LEGAL FOR STREET USE IN CALIFORNIA) *NOTE: Roller cores are available only as 3-bolt.*
DURATION AT SEAT IN/EX	LOBE SEPARATION	GROSS VALVE LIFT IN/EX	DURATION AT .050" IN/EX	TYPICAL APPLICATIONS	POWER RANGE
286/286	108	.605/.605	255/255	Good in hot street cars, 3000+ converter, also short oval tracks. lots low end torque.	2800-6500
290/290	108	.651/.651	259/259	Hot street/bracket car with 3500+ converter or 4-speed, also for dry slick ovals.	4000-7500
302/302	104	.640/.640	273/273	383 SS/GT, 5000 converter.	4000-7500
312/321	108	.685/.682	280/290	440 SS or bracket, 5000 converter, also 383 with 4-speed.	5000-8000
315/325	108	.715/.683	282/292	383 SS/GT 4-speed, good 440 Super Gas with 5000 converter.	5000-8500
316/326	108	.715/.715	285/292	Good Super Comp cam, Bigger engines, Light car, 5000 converter.	5000-8500
324/324	108	.750/.750	290/290	440 SS/GT light car, 5000 converter.	5000-8500
328/336	110	.772/.765	294/304	Very large engines over 500 CID, 2500 lbs. car and under with Lenco.	5000-8500

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