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  1. #21
    LTX Master


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    When I mocked the rockers up I couldn't get them off the retainers. the clearance was too tight when the valves were closed. It finally dawned on me that the spring and retainer package was designed to use lash caps. the lash caps got the rocker up higher but not by much. If you look at the photo in post #18 you can see the line I drew across the rocker arm centerline. I was trying a mid lift technique to determine proper push rod length. With the valve exactly at the middle of its lift it appeared I needed a ~7.40" pushrod. But keep in mind that measuring for pushrod length in this fashion will produce different numbers with different rocker arms and will not necessarily have the roller tip centered on the valve tip. In my case the roller was way too far out on the valve tip. I compromised with a 7.30" to get the roller tip centered. 7.20" is the stock length.
    Last edited by JOATMON; 02-14-2018 at 09:32 AM.
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  2. #22
    LTX Master


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    Attachment 38222Attachment 38223Attachment 38224
    This was my initial pattern with the Crane rockers, my simple old faithful spring compressor. Pattern is a bit difficult to see using a dry erase marker, I later tried using lipstick and found it to be the ultimate pattern marker. I would like to claim I thought of this first, but I'm sure someone did it before me. LOL
    Last edited by JOATMON; 02-14-2018 at 09:44 AM.
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  3. #23
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    I actually put the rest of the valvetrain together using the Crane rockers. The rocker alignment was a compromise on being centered left to right even with adjustable guide plates. (the original build had fixed guide plates!) It's a real pain to do rocker/guide plate alignment with a mirror and a flashlight. Earlier I mentioned the other paths of oil migration into the combustion chambers, well another path on these heads is through the intake rocker studs. You HAVE TO put sealant on the intake rocker studs because they are drilled all the way into the intake ports. Vacuum will literally suck oil through the stud threads from the top of the heads.
    Well after running the engine, the valve train still sounded horrible. Then I discovered a problem I hadn't noticed, AFR had not ground out the casting flash on one exhaust pushrod slot. It must have been missed on QC check. I missed the bad alignment because of the difficulty of working with a mirror. I wound up having to pull the intake again and VERY VERY carefully grind out the casting flash without getting any in the engine.
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  4. #24
    LTX Master


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    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  5. #25
    LTX Master


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    Default Time for new rockers

    I decided that I needed a different style of rocker because I still had a bare minimum clearance as far as rocker to retainer clearance and in the pushrod slot to pushrod area. I got it in my head that a set of long arm Crower rockers would cure all my clearance problems. This was considering that AFR claims you can run straight rockers on these heads. So I called and talked to the Crower folks and they agreed with the long valves and lash caps, the center to center measurement at the top of the stud to the top of the valve tip was so much closer that a backset rocker was just what I needed.
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  6. #26
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    Well I put it together again figuring the Crowers were gonna be the ticket. I had to drop down to a 7.2" pushrod to get a decent center pattern on the valve tips. I tons of clearance between the rockers and retainers, but the push rod to head slot was very close(about .015" using a piece of wire as a feeler gauge). I ran it again and the valvetrain noise was unacceptable. It seems the pushrods were just slapping the heads further down in the pushrod slot.
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  7. #27
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    IMG_0995.JPGIMG_1011.JPGIMG_1188.JPG
    Notice how close the clearance is on the pushrod
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  8. #28
    Lurker


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    Joel
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    Nice build thread. Seeing more and more flawes in there castings that have left the factory. The difficult part is that they make the best set of heads for the LT1.

    Sent from my Moto Z (2) using Tapatalk

  9. #29
    LTx Guru


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    Fred
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    Do you think an offset lifter would clean up the pushrod geometry?
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

  10. The Following User Says Thank You to Injuneer For This Post:


  11. #30
    LTX Master


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    Offset rockers coming up, it's fixed now. I like to do photos to help people. But I've had too many beers to continue tonight. I've read alot of your posts and appreciate your troubleshooting skill. I was just checking in to see if I was just talking to myself. Stay tuned.
    Nolan
    '97 SS SLP,T56, Spec stage 2+ clutch,385 stroker,AFR210,XFI292,Moser 12 bolt eaton posi 4.10's. NO traction til top of 3rd gear.
    '57 Chevy 3100 p/u LT1/T56
    Wife's '94 Z28 has been sold.

  12. The Following User Says Thank You to JOATMON For This Post:


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