cam for a 540
#1
Charter Member #737
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cam for a 540
Need to put a larger cam in a 540 and would like to know what size people are running. The motor has merlin heads with 345 intake runners, dart intake and holley 950. The cam I am running now is a comp hyd. roller part number 01-775-8 lift is .591 intake and .601 exhaust. The motor is bolted to a bravo 1. Thanks for any info.
#2
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Mine is a crane 741 cam. The current number is HR-306-2s-14 IG. This cam has the following specs: 244i 256e duration, 114 degrees of separation, .632" lift. Your heads and carb suggest that your existing motor is making more than my 600hp, and proably at a higher rpm. If so, then you may consider stepping up to the 751 cam-but you'll be spinning it pretty hard.
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MY SET-UP
I have the 741 on my 540 also. Full port and polish Eldebrock head with port matched intake. It dynoed out on hp at 683 @ 5680. They didn't take the dyno any higher and torque was 676 @ 4700. Carbed with a Barry Grant 850 flowing 930 cfm. One sweet running motor from 300 rpm to 5600!
#5
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My 540's have Crower hydraulic rollers 236/244* on 114* lobes, fully ported Dart Pro-1 aluminum heads that oringinally started out at 310cc intake runners....with full port (guessing) they are now probably about 320cc. Engines make about 682hp @5500rpm (about 699hp @5700rpm) and 694 foot pounds of torque @4800rpm. My cam is very simular to MIKEHTMSR24'S Crane 741 hyd roller cam as well. You can usually get away with a smaller cam with well ported heads. Typically, I here of some guys running larger 244*/256* cams in a 540" engine which is okay, but I actually prefer running a smaller cam that I can get away with for smooth idling/drivability.
#6
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I agree with KAAMA. The heads are critical. I ran a 540 not too long ago with Hendrick Motorsports modified Chevy aluminum heads, 9.0:1 actually measured compression. The cam was a Comp Cams 288AR8. It likes valve springs and is solid roller so it needs attention but it made 724lb-ft at about 5100rpm and 721hp at about 5650 on Hendrick's dyno. Solid is better IF you don't mind adjusting valves and the maintenance!
#7
Charter Member #737
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Thanks for the input. I sold the motor to a friend and he wants something more than the cam I had in the motor.
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Originally posted by bobby daniels
HEY BLOWN 1500 DID YOU EVER GET OFF THE BLACK TAR HERION?? YOU DO THINK BETTER ON IT !!!!!
HEY BLOWN 1500 DID YOU EVER GET OFF THE BLACK TAR HERION?? YOU DO THINK BETTER ON IT !!!!!