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Author Topic: What heads for 318?  (Read 1890 times)

Dan Cluley

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What heads for 318?
« Reply #15 on: July 11, 2008, 05:54:18 PM »

I assume the rockers and valves and stuff get dissasembled before the heads go to the shop.  Does the small stuff get tanked as well?

The odometer in the 5th ave read 37K.  The motor seemed awfully sludgy for that, but the rest of the car seemed awfully nice for it to be 137K.  The "Big Band" cassette case on the floor would seem to indicate the former owners were older folks (or Mobby has a twin here in Michigan) D Cluley2008-07-11 22:55:46
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Leaburn Patey

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What heads for 318?
« Reply #16 on: July 11, 2008, 06:40:55 PM »

Yes,the rocker shafts,and valvetrain gets disassembled prior to hot tanking.
You can ask the machine shop if they can,or clean them yourself to keep costs down.
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Stitcherbob

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What heads for 318?
« Reply #17 on: July 11, 2008, 07:30:31 PM »

The rockers may have to be changed (a different ratio for roller cam engines I think), but they are good heads.

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Dan Cluley

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What heads for 318?
« Reply #18 on: July 12, 2008, 01:46:34 AM »

Based on the part numbers I found on RockAuto, the rockers are the same for both 74 and 85.
 
However the push rods are different lengths and the exhaust manifold gaskets are different. (everything else looks to be the same)
 
Will the old pushrods work with the 302 heads?
 
Which exhaust gasket?
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Snotty

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What heads for 318?
« Reply #19 on: July 14, 2008, 10:22:07 AM »

I'm jumping in here a litel late, but...
 
If you swap on a set of 360 heads, you can use a better intake like the Edelbrock Performer and use a 4bbl.  (The intake holes are too large on those to use with stock 318 heads.)  You will also have better exhaust flow.
 
However, I don't know what those would do to your compression.
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James Brown Jr,

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What heads for 318?
« Reply #20 on: July 14, 2008, 01:03:44 PM »

geez dan your doing Exactally what i'll eventually do to Susan. good stuff to know.
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Butch Houghton

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What heads for 318?
« Reply #21 on: July 16, 2008, 07:40:47 AM »

Dan,  the pushrods from your motor will work.   Rockers are the same for the flat-tappet & roller 318's too.   Roller motors have the roller lifters, dogbones to keep them in alignment, a "Spider" plate that keeps the dogbones in place & shorter pushrods.    Some roller blocks came with regular Hydraulic cams & it's the same valvetrain as any 318 non-Magnum.

I just built Nephews new 85 318 roller 318 & used the 302's that came with it with new Hydraulic lifters & a Summit cam & used the old 75 motors pushrods & rocker assy's.  Also used the timing cover/balancer & oil pan from the 75 motor. 

The only extra thing to do to those heads as said is to plug the A.I.R ports under the exhaust ports with allen set screws & locktite.   I used 1/4-20 set screws & just had to drill & tap.

If they're every 318 head Ive' seen with miles on it  the guides will be worn & the valve seals shot ( biggest  oil use culpirt ) .   You can get by cheap by cleaning yourself & if you can borrow/rent/buy a valvespring tool you could hand-lap the valves yourself & put on new valveseals ( I'll send ya a set if ya want ..I think I have about 3 sets of Umbrella-type seals ) .  Been there done that for a cheap fix that lasted quite a few miles.

Or...since they're a better head anyway....do like Lea said &have them cleaned & magged & have the guides checked & or replaced, new seals & a valvejob done professionally & they'll last another 100K.

Just depends on what you wanna spend.

Butch


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Dan Cluley

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What heads for 318?
« Reply #22 on: July 18, 2008, 09:46:58 PM »

I appreciate the info and the offer Butch.

I still haven't had a chance to call around and see what kind of money shops want for this stuff.  We actually had a couple of nice days in a row, so I've been painting.
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Arlen Vander Hoff

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What heads for 318?
« Reply #23 on: July 19, 2008, 02:06:46 PM »

Yeah "hand lap" thats the other thing I couldn't think of Thats what you do with the suction cup on a stick and the abrasive paste. I know what I mean if anyone understands me then that would be scary!!!
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