Valve setting w/aluminum block and heads
#2126109
08/05/16 09:43 PM
08/05/16 09:43 PM
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BANDIT
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Hi, never having had an aluminum headed, aluminum blocked motor before, what is a good starting point on valve lash with a cold engine? Calls for .018 when hot, but gotta get it there first. Jim
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
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Re: Valve setting w/aluminum block and heads
[Re: PorkyPig]
#2126115
08/05/16 09:53 PM
08/05/16 09:53 PM
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BANDIT
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Yup, it's all aluminum. Used to do .004 under spec with just aluminum heads, so was curious what difference aluminum block would have. Jim
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2126126
08/05/16 10:02 PM
08/05/16 10:02 PM
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Joined: Jan 2003
Posts: 12,286 Benton, IL.
DaveRS23
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Special needs idiot
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Benton, IL.
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I would get nearly .020 growth on my Keith Black al block and heads. Since the cam card wanted .020 hot, I set the valves at .005 cold (the minimum recommended lash) and called it good.
That engine grew so much that I had to kinda ignore the hot lash setting in favor of the minimum cold gap allowable. The hot lash was usually .025 or so.
Master, again and still
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2126146
08/05/16 10:35 PM
08/05/16 10:35 PM
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Joined: Sep 2003
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BANDIT
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This engine was dyno'd by builder, and valves set, but was checking spring pressures with my gauge for future reference, and noticed that a lot of the lash settings are under .005 cold, couple are no lash. Oh, and just found 1 spring 155# less than other 15. UghhhJim
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2128625
08/09/16 12:52 PM
08/09/16 12:52 PM
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Joined: Jan 2003
Posts: 13,402 Marion, South Carolina [><]
an8sec70cuda
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My all aluminum hemi grows .013" when it gets hot. I set them at .010" cold so I have about .023" when hot.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2128693
08/09/16 02:04 PM
08/09/16 02:04 PM
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Joined: Jan 2003
Posts: 19,384 Las Vegas
Al_Alguire
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I can tell you on my B1/KB deal we run .016" hot and if it was cold enough out it would not start cause the valves were open. When I say cold I am talking in the 40's. I really could not set them cold, on first fire up we would set them to .004 and then readjust them hot. When cold it was pretty much impossible to get anything in there but you could wiggle them a bit. On my Predator/World deal we have .006 cold..My other B1/KB deal is at .004 cold.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2128801
08/09/16 05:25 PM
08/09/16 05:25 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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A lot of it depends on how hot "hot" is. On a couple of the drag motors I built where I was doing the pulls at around 140-145deg, and setting the lash at that same temp, world blocks and Indy 440-1 or 572-13 heads it would only grow about .006-.008. I would set them at .012 when I assembled the motor and they were real close to the desired .020 at 140deg. One customer ran his motor at closer to 180-190, which made a pretty big difference in how much the lash changed from cold to hot. As I recall he was down around .004-.005 cold to end up at .020 hot.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2128802
08/09/16 05:26 PM
08/09/16 05:26 PM
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BANDIT
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It's an Indy block and 572 heads. I'll set them at .004 after the spring problem is resolved, then set them hot. Kinda surprised valve spring went away with only 47 passes plus dyno time, but since its only one I'm hoping it was just a fluke. Company is going to send some replacements. Jim.
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2128803
08/09/16 05:32 PM
08/09/16 05:32 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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Be sure to check the net coil bind height of the springs you put in, and make sure that works with your actual net lift and installed height. If you're using "all" of the spring, you need to check every one..... They often don't all coil bind at the exact same height..... Or the c/b height spec.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2128943
08/09/16 09:03 PM
08/09/16 09:03 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
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Are you oiling the valve springs through the rocker shafts? If so are you oiling the rocker shafts full time? If not maybe you should
Last edited by Cab_Burge; 08/09/16 09:03 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2129125
08/10/16 12:12 AM
08/10/16 12:12 AM
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BANDIT
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PSI 1281 springs with .867/,850 gross lift cam. Build sheet says 390# @2.200 and that looks to be about where they are at on the ones I checked. Have to wait for compressor to get here to verify installed height. 14 springs were 375 to 390#, one was 350, and the worst was 255#. Dave @ PSI very good to work with, he is gonna send me a few replacements.
64 Dodge Coronet 440. In progress 1998. Dodge Avenger. 8.35@165. 4400 DA 250” Neil and Parks Slip Joint. 7.36@183. 4600 DA 242" Mullis Dragster. 6.90@ 200mph
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Re: Valve setting w/aluminum block and heads
[Re: BANDIT]
#2129520
08/10/16 02:52 PM
08/10/16 02:52 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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I'm probably just a wuss, but that seems like an awful lot of spring for an .867 lift cam.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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