69 427/390HP Cam

[Don W.]

Based on some old receipts I found from the prior owner; this is cam currently in the engine:

Crane Energizer Cam 260
Cam StyleHydraulic flat tappetBasic Operating RPM Range1,000-4,600Intake Duration at 050 inch Lift204Exhaust Duration at 050 inch Lift204Duration at 050 inch Lift204 int./204 exh.Advertised Intake Duration260Advertised Exhaust Duration260Advertised Duration260 int./260 exh.Intake Valve Lift with Factory Rocker Arm Ratio0.484 in.Exhaust Valve Lift with Factory Rocker Arm Ratio0.484 in.Valve Lift with Factory Rocker Arm Ratio0.484 int./0.484 exh.Lobe Separation (degrees)110Computer-Controlled CompatibleNoGrind Number260 H10


The new recommendation is the Sealed Power CS1093M; This cam was probably the best STREET big block, flat tappet cam EVER devised.The CS1093M is an exact duplicate of the OE cam. It is built to the GM print."
I cannot find the specs for the CS1093M; but I was wondering if anyone knows how it compares to the above Crane cam which is in the engine now?
Thanks,

Don

[Clem Z.]

Re: 69 427/390HP Cam

complete specs.
Chevy 396-454ci Big Block 1965-96

*Note: In order to use these camshafts in 1965-66 396/427ci blocks, it is necessary to machine a 3/16'' wide x 7/64'' deep groove in the rear main journal of the cam to allow oil flow to the top of the engine.
SMOOTH IDLE, DAILY USAGE, OFF ROAD, TOWING, BRUTE LOW-END TORQUE, 1600-2200 CRUISE RPM, 8.0 TO 9.5 COMPRESSION RATIO ADVISED. Grind Number:260-H10Operating Range:1000-4500 RPMDuration Advertised:Duration @ .050'' Lift:Valve Lift w/1.7 Rockers:.484'' Intake / .484'' ExhaustLobe Separation Angle:Max Lift Angle:Open/Close @.050'' Cam Lift:

[Don W.]

Re: 69 427/390HP Cam

Not being a cam expert: I'm not sure how they compare. It looks pretty much the same to me...Don

[Clem Z.]

Re: 69 427/390HP Cam

Not being a cam expert: I'm not sure how they compare. It looks pretty much the same to me...Don

3883986(427/390 HP) cam as listed by GM. dur@.050 214/218 degrees,lift .460/.480,lobe centerline 115 degrees. the CS1093M is a mercury marine cam for BBC but i can not find any specs.

[Don W.]

Re: 69 427/390HP Cam

I believe the 3883986(427/390 HP) cam is discontinued...Don

[Clem Z.]

Re: 69 427/390HP Cam

I believe the 3883986(427/390 HP) cam is discontinued...Don

if you can find the specs on the CS1093M you can compare to the 3883986 specs

[Don W.]

Re: 69 427/390HP Cam

Here's what I can find on google:

SEALED POWER Part # CS1093M Category: Camshaft 396/350HP L34 HYD FLAT TAPPET SPECS-214/218,.461"/.480",115 DEG LSA

[Joe L.]

Re: 69 427/390HP Cam

Here's what I can find on google:

SEALED POWER Part # CS1093M Category: Camshaft 396/350HP L34 HYD FLAT TAPPET SPECS-214/218,.461"/.480",115 DEG LSA

Don------


The L-34 cam was exactly the same as the L-36 and L-68. The GM cams are discontinued.

[Duke W.]

Re: 69 427/390HP Cam

Specs for all the Sealed Power/Speed Pro OE replacement cams from Federal Mogul are on the NAPA web site. All you need is the OE GM number or the FM replacement number.

Duke