I need an old guy....
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
Those dust storms, I don't miss!!
Thanks for the reply.
orich
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
Here's another thought to suggest mechanical problems. A buddy of mine and I put the top end on his chebbie and after adjusting the valve lash per the Chilton manual it had a dead miss we spent an hour or two researching we found out that the Chilton manual wasn't exactly right so we re adjusted the valve lash upon our research and guess what no more dead miss
Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
Also how did you adjust the valves? Did you let it run then tightend down the rockers till the lifters stopped ticking or did you torque them all to a specific torque number. Did you adjust them with out it running on the compression stroke first?
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
Some where back pages he said he was getting like 135+- from each cyl. hole so the should mean valves are damn close or right on..orich
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Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
My bad nvm just tell me too stfu lol.
Valve timing
Intake opens before tdc
1971-73 351c 12degrees
V8-351c, 351m, 390, 400, 429 & 460 with non adjusts me hydraulic lifters
For these engines a .060" shorter push rod (color coded white) or a .060" longer push rod (color coded yellow) are available for service to provide a means of compensating for dimensional changes in the valve mechanism.
To check the clearence, bring the piston of the cylinder being checked on top dead center of the compression stroke. Then with hydraulic lifter collapsed, check the clearance between valve stem and rocker arm. If the clearance is less than the minimum listed in the specifications the .060" shorter push rod should be used. If the clearance is more than the maximum specified the .060" longer push rod should be used
Valve specs
1971-72
Int .100-
Ext .200
Seat 45
Face 44
Valve spring installed night
1 13/16
Valve spring pressure
Lbs. @ In.
80. @ 1.82
Stem Clearance
Int .001-.0027
Ext .0015-.0032
Stem diameter
Int .3416-.3423
Ext .3411-.3418
Valve timing
Intake opens before tdc
1971-73 351c 12degrees
V8-351c, 351m, 390, 400, 429 & 460 with non adjusts me hydraulic lifters
For these engines a .060" shorter push rod (color coded white) or a .060" longer push rod (color coded yellow) are available for service to provide a means of compensating for dimensional changes in the valve mechanism.
To check the clearence, bring the piston of the cylinder being checked on top dead center of the compression stroke. Then with hydraulic lifter collapsed, check the clearance between valve stem and rocker arm. If the clearance is less than the minimum listed in the specifications the .060" shorter push rod should be used. If the clearance is more than the maximum specified the .060" longer push rod should be used
Valve specs
1971-72
Int .100-
Ext .200
Seat 45
Face 44
Valve spring installed night
1 13/16
Valve spring pressure
Lbs. @ In.
80. @ 1.82
Stem Clearance
Int .001-.0027
Ext .0015-.0032
Stem diameter
Int .3416-.3423
Ext .3411-.3418
Logistics Pro
Joined: Jun 2003
Posts: 3,924
Likes: 273
.060" difference in the pushrods.
I think the hydraulic lifters have a .050" tolerance. Part of cylinder head assembly by a reputable machine shop requires spring height installed measurement. On a head with pedestal mount rockers, spring height measurements exceeding the specified tolerances are adjusted by machining the valve stem tips.
I think the hydraulic lifters have a .050" tolerance. Part of cylinder head assembly by a reputable machine shop requires spring height installed measurement. On a head with pedestal mount rockers, spring height measurements exceeding the specified tolerances are adjusted by machining the valve stem tips.
Logistics Pro
Joined: Jun 2003
Posts: 3,924
Likes: 273
You can also machine the pedestals, install studs & guide plates and run adjustable rockers. Other than that, machine shops rebuild pedestal-mount heads within factory tolerances so that you do not need to worry about measuring and installing different length pushrods.
As someone already stated, the compression numbers are not indicative of a tight valve.
As someone already stated, the compression numbers are not indicative of a tight valve.
Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
The problem is fuel has been fuel out fire has been ruled out he never replied to my question about blow by on cylinder 8 because chromiloy rings some times don't seat right. There is no logical explanitaion other than valves ain't right or the rings haven't set right or the compression reading was of