Four dead on right side
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New User
Joined: Jul 2003
Posts: 21
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From: Chester County PA
Four dead on right side
If anyone has head machine experience I could use some help...stock 84 460. intake blew, was run for 8 hours gas was in oil. Oil was thin and bad..heads were sent out they were cracked. I sent them a 78 set to close crossover and basic valve job new springs. 8 exaust valves guides replaces. new intake and carb, replaced lifters and springs... It runs on left four. 120psi. the right swings... I short out right 4 and no response all 4 on left drop rpm...it spits out the carb and you can hear it hiss and compress out the valves on right side, as if valves are not closed all the way. I have had the heads back 3 times and still think they are missing something. they say... valve height, deck height, and casting numbers are correct...Can someone say for sure this is not a chain problem...I checked and there is some slop...but left side seems to be correct and not a timing issue...its running on left 4 fine... If anyone has seen this before I could use your help Thanks Jim
Freshman User
Joined: Aug 2001
Posts: 40
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How could it be a chain problem... both sides
run off the same chain.\cam..
have you checked for water the oil
could be the heads are not down properly...
head gasket not correct, thickness..
I'd take of f the vavle covers and check for
play the torque downt the heads again, and
tighten the rocker bolts...
run off the same chain.\cam..
have you checked for water the oil
could be the heads are not down properly...
head gasket not correct, thickness..
I'd take of f the vavle covers and check for
play the torque downt the heads again, and
tighten the rocker bolts...
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
Your valves are 'taller' relative to the head, thus pushing the rocker 'down' relative... leaving the valves a little open. TO test, remove rocker cover, and loosen the rocker nuts about 1/2 turn or so. Idle, and see if it is improved. If it is, you can 'fix' it by placing washers under the rocker studs. At least it worked for me in 1978 on my Dad's 429 that he had head work done to. Rocker geometry was just a skosh too tight.
tom
tom
Senior User
Joined: Apr 2003
Posts: 126
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From: Alaska
When I rebuilt my 83 460 the ford manual called for a certain clearance between the rocker and the valve stem with the lifter collapsed all the way. Make sure you have all the oil bled out of it then check the clearance. The allowable clearance is between .075-.175 the preferred clearance is between .100-.150
If it is too tight then obviously your valves won't close thus no compression and no fire. They make shims that will go under your rocker to adjust that clearance. Ford has different length push rods to adjust it also. When I got my heads back from the machine shop I had to adjust the clearance on some of the valves to get in the preferred range. While you're in there check the torque on your head bolts. If this doesn't do it then I'd start checking gasket problems. I'm just assuming your pistons and cylinders looked good?
Good Luck,
83 F350
If it is too tight then obviously your valves won't close thus no compression and no fire. They make shims that will go under your rocker to adjust that clearance. Ford has different length push rods to adjust it also. When I got my heads back from the machine shop I had to adjust the clearance on some of the valves to get in the preferred range. While you're in there check the torque on your head bolts. If this doesn't do it then I'd start checking gasket problems. I'm just assuming your pistons and cylinders looked good?
Good Luck,
83 F350
Last edited by 83 F350; Oct 23, 2003 at 07:07 AM.
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