crane 741 series
 

Can someone give me the specs on a Crane 741 series cam?

Re: crane 741 series
 

http://www.cranecams.com/

type in 741 into the part number search.

Re: crane 741 series
 

I tried that but it comes up with a bunch of different cams. I'm assuming its this one for a GenVI 502 full hydraulic roller?

Part Number: 139651 Grind Number: HR-306-2S-14 IG
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1967 Up CHEVROLET 8 ROUGH IDLE, PERFORMANCE USAGE, GOOD MID AND UPPER RPM HP, BRACKET RACING, AUTO TRANS W/3500+ CONVERTER, MARINE PERFORMANCE, 3800-4200 CRUISE RPM, FOR 500+ CU. IN. ENGINES, 10.5 TO 12.5 COMPRESSION RATIO ADVISED. BASIC RPM 3800-7000
Engine Size Configuration
396-454 C.I. V

Valve Setting: Intake .000 Exhaust .000 HOT

Lift: Intake @Cam 372 @Valve 632 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 372 @Valve 632
Rocker Arm Ratio 1.70

Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 40.0 BTDC 86.0 ABDC 306 °
Exhaust 94.0 BBDC 44.0 ATDC 318 °

Spring Requirements: Triple Dual Outer Inner
Part Number 99896
Loads Closed 150 LBS @ 1.900 or 1 29/32
Open 466 LBS @ 1.290
Recommended RPM range with matching components
Minimum RPM 3000
Maximum RPM 6400
Valve Float 6800

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 13.0 BTDC 51.0 ABDC 109 244 °
Exhaust 67.0 BBDC 9.0 ATDC 119 256 °

Re: crane 741 series
 

There are different grinds for various Gen's
Gen VI
http://www.cranecams.com/index.php?s...41&lvl=2&prt=5
Z-Cam
http://www.cranecams.com/index.php?s...21&lvl=2&prt=5
Gen IV-V
http://www.cranecams.com/index.php?s...41&lvl=2&prt=5

525 EFI
16HR00004
298º/306º
236º/244º
.610"/.632"
114* LSA

Re: crane 741 series
 

I was just trying to find something compatable with the cam I just bought. I have a custom ground Clay Smith.
in. opens 37
in closes 77
duration at .050 246
in valve lift 630
ex opens 77
ex closes 37
duration at .050 246
ex valve lift .630

This cam was ordered specially for a set of Canfield heads. I've been waiting 4 months for the heads and am about ready to give up on them. I was looking as some Darts or some World Products from Teague. I found a couple of places that actually have them in hand. I can't find any AFR's in stock anywhere. Teague recommended I ditch the Clay Smith and go with the 741 series instead, I'm a little confused because they seem similar as far as lift goes.

Anybody have any heads they can ship immediately? I need to get this back together and get it over to AZSM before Desert Storm Poker Run. If not I will probably go with Teague's heads that they custom spec out from World Products.

Re: crane 741 series
 

Badkachina,
The primary difference is the Clay Smith is a single pattern and the Crane is a dual pattern cam. The Crane is 10º shorter on the intake side, slightly less lift, and 2º shorter on the exhaust side with similar lift.
Most marine applications benefit from a dual pattern profile.

What runner/combustion chamber dimensions will you be using? We may be able to help with the AFR product line.
Bob

Re: crane 741 series
 

Canfield is behind 500 sets of castings. . .marine hard anodized don't even mention. RMbuilder has the AFR deal...

Re: crane 741 series
 

I was going to use 310 intake runner with 125 combustion chamber to drop my compression a little since it's a blower motor. I figure I can run either 310 or 325 intake runner with 118 or bigger chamber. The motor is a gen vi 502 mag efi with a vortech supercharger.

Re: crane 741 series
 

I know, they make good stuff, but if you can't buy it what good is it?

Re: crane 741 series
 

Nobody has a line on some heads??????????????