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Thread: BBC Cam help

  1. #1

    BBC Cam help

    Burnout box

    Join Date: Jul 2009
    Posts: 7

    Camshaft help please!
    I am running a bbc in a 3800 lb shoe box(1956 chevy wagon)_I run a 10.50 index on motor and have been playing around with a plate system and lately a fogger to just "chase E.T.". My cam shaft is ground on a 106 lobe center and now I want to change the cam to perform better with spray. I currently can run 10.10 on the motor, and am willing to sacrifice 2 to 3 tenths with the new cam. My desire is to add 300 hp with the fogger.
    Here is my current combo, GM block 4.350 bore and 9.80 deck, 3/4 filled with hard block. 4 bolt mains with studs, Eagle 4.25 stroke crank, eagle rods w/ L19 bolts. KB premier pistons with 37 cc domes. Hellfire rings gapped .032 top .030 middle. Standard tension oil ring. Heads are 320 cc match ported, 2.19 / 1.88 valves with Vasco springs (250 seat 800 open) titanium retainers and Yella Terra pedestal rockers. Head studs, MLS head gaskets and CR of 12.5 to 1.
    The intake is a Edelbrock tunnel with two 800 cfm Holly's ,square jetted.
    The current cam has 780 lift (intake and exhaust) w/ 1.7 rockers intake duration 285, ex. 287 lobe center 106.
    Do you think my rotating assembly (particularly the pistons) will handle 300 or more nitrous?
    Do you think a cam with the same specs but ground on a 112 LC will work with .028/ .032 jets?
    Can anyone recommend a "off the shelf" cam that will perform for me both N/A and juiced?
    If I have a cam ground should I speed up the exhaust opening? Can I advance the cam and get more benefits for NOS and not hurt my N/A power?
    My gears are 4.33 with 32" DOT Mickeys. I currently go through the lights at 6800 running N/A (133 mph) and see 7000 running 9.50 @ 140 mph with my current cam and .028/ .032 tune. Thanks in advance !!!
    Mark :wink:

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Feb 2004
    Location
    san antonio, texas
    Posts
    1,233
    call compitetion cams, those guys are good at cams, good luck 8)

  3. #3
    Senior Member EXPERT BUILDER
    Join Date
    Jan 2005
    Posts
    336
    id hope your running a steel crank,2618 grade forged slugs...sounds like u got right l19 rod bolts, and strong block,hope it is main cap and head studded!!!

    300 shot those hellfire rings will be good,just have ring gap correct!!!

    as far as a cam goes id seek out udharold,i wish i would have a cam of his...my current 572 with a big shot kit has a comp cams 286/296 @.050 .748 lift on both on a 112 center lob sep.

    my cam is too much for my 10:1 pump gas motor spining from 3500-7100 rpms.....wish i had a udharold cam!!!!

    ive seen mid eights in my chevelle hoping for low eights next weekend(if not snowing lol!!!)

    by the way opening the lobe sep and adding 10 degree of duration onto exhaust side @ .050 seem to be flavor of the day

  4. #4
    Quote Originally Posted by russ67chevelle
    id hope your running a steel crank,2618 grade forged slugs...sounds like u got right l19 rod bolts, and strong block,hope it is main cap and head studded!!!

    300 shot those hellfire rings will be good,just have ring gap correct!!!

    as far as a cam goes id seek out udharold,i wish i would have a cam of his...my current 572 with a big shot kit has a comp cams 286/296 @.050 .748 lift on both on a 112 center lob sep.

    my cam is too much for my 10:1 pump gas motor spining from 3500-7100 rpms.....wish i had a udharold cam!!!!

    ive seen mid eights in my chevelle hoping for low eights next weekend(if not snowing lol!!!)

    by the way opening the lobe sep and adding 10 degree of duration onto exhaust side @ .050 seem to be flavor of the day
    yep...got it studs, gaps, forgings! I'm thinking .780 In and ex 282 In and 292 Ex @112 lc advance 5 degrees from straight up and pull the trigger!


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