Re: 440 engine heads/springs
[Re: roy2345]
#537856
11/27/09 02:24 AM
11/27/09 02:24 AM
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Joined: Jan 2003
Posts: 2,006 s. e. pa.
calrobb2000
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,006
s. e. pa.
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hi heads are the same the springs are not ! hp motors had a redspring with a inner flat damper !
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Re: 440 engine heads/springs
[Re: roy2345]
#537861
11/27/09 11:21 AM
11/27/09 11:21 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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yes,they can be swaped with head on engine short piece of rope in the sparkplug hole,hand crank it till the rope is compressed against valves to hold them hand crank spring compresser and swap the seals while your there is a good idea IMO,never liked the air hose trick,to easy to drop the valve,,been there and had to pull the head..might have helped to have the piston at top..which I did not do I used a KD tool hand crank compresser from napa..about 60$ new spring to match cam is a must and good insurance
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Re: 440 engine heads/springs
[Re: roy2345]
#537863
11/27/09 01:09 PM
11/27/09 01:09 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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no,seals,seal the valve stem were it slides in the vlave guide to keep oil from working down the stem into the comb chamber,where it burns and cause the engine to smoke. those heads have the hard seat already for unlead gas.. look for pits on the exhast valve edge and the seat part in the head that the valve seals off on,pitts cause it to leak. before you take the valve out,set it up and pour some water in the port to see if the valve leaks thats 1 way to see if it needs a valve job. which they regrind the seat and valve edge with 3 angles or more,to seal it and not leak. doing a valve job at the machine shop.. with the spring off,see if you can move the valve stem tip back and forth.that checks the wear on the valve guide..
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Re: 440 engine heads/springs
[Re: scratchnfotraction]
#537864
11/27/09 01:17 PM
11/27/09 01:17 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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OH! my bad,I see its a 70-440 new yorker what heads are on it?,it could have been swaped since 1970 I was thinking #452 heads from 75 and later dont think the 70 had hard seats yet.
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Re: 440 engine heads/springs
[Re: roy2345]
#537867
11/28/09 02:24 PM
11/28/09 02:24 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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yes,they have to come off for seats to be milled and pressed in.
yes,you can do the cam,lifters,t-chain,springs,seals,with them on the engine
I have done a few with out a valve job
with the rockers and shaft removed use a straight edge across tips of valves
if any are sticking up higher than others, then most likly it needs a valve job cause the valves are sunk into the heads,IIRC
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Re: 440 engine heads/springs
[Re: roy2345]
#537868
11/28/09 02:45 PM
11/28/09 02:45 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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You have 906 heads which didn't have (& didn't need to have) hardened seats as '70 gas had lead in it but there hasn't been much or very little lead used since the mid 70's so between that & the 40 yrs of use I'd sure think the heads need some major attention especially if you are planning on some serious hot rodding. I see heads for cheap all the time and you might get a set of later hardened seat ones & go thru them to have them ready & minimize your down time & if you want to stay original which I didn't get the feeling you did, you could redo your 906's w hardened seats on the ex side & as said new springs also to go with a new cam/lifters but then most likely the valves are also probably shot esp the ex's as they run hotter and with the amt of $$ that this endeavor will up taking to do it right you might consider some stealths s
live every 24 hour block of time like it's your last day on earth
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Re: 440 engine heads/springs
[Re: roy2345]
#537872
11/28/09 05:51 PM
11/28/09 05:51 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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The ex is way restricted. those 68-70 Hp manifolds flow pretty good for manifolds but I'd suggest 2&1/2" MANDREL pipes all the way back (w an X connector)and free flowing muffs and some resonators in the rear to continue with keeping the noise down. What is your initial and total timing? An overview, you'd want to tune the initial for the cam then the slot length for 36-38 total (vac adv disconnected) then the springs for just below the pinging point at WOT then plug in the vac adv & stay just under the pinging point at part throttle. Any pinging is very destructive so for now (depending on what your initial is & I am assuming it is very conservative ~10btdc??) you might stick a 3/32" allen wrench into the vac adv & turn it 2 full turns CCW & try it out.
live every 24 hour block of time like it's your last day on earth
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