OMC V-4 Head Pics

[Over-Easy]

There's another post that's active right now about crossflow heads, which got me wondering, does anybody have pics of the cumbustion chambers of 135HP, 140hp heads and a standard 90-115hp head to compare. I've always assumed the chamber shapes were the same, but, be the CC was different. Now I'm reading the shape is even different. If anybody has these pics and could post them I'd really appreciate it.

Sorry if this seems too elementary, but, maybe others out there don't know the difference either.

Thanks

[Riverman]

Sorry if this seems too elementary, No way!!! Very good question. I'll take some pics of what I have.

[Riverman]

These are both port side heads.

The head on the left is a crappy 90/115 head, P/N 326505. It is off an 84 115.

The head on the right is a 77 140 head, 321900. Look at the difference in the chamber volume - it is huge! I believe these heads were milled too, but I don't know the volume. These are the best 140 heads, but there are 2 different 135 heads for the V4 that are tighter.

[EMDSAPMGR]

The old 125 heads are also a high compression head, but are missing the cast coil brackets.

[Riverman]

The 77 140 head pictured above also lacks coil brackets.

[A Fn Noob]

http://i89.photobucket.com/albums/k224/A_Fn_NOOB/100_3097.jpg

1973 Heads. I notice that these and those 1977 heads have a much different shape. Almost like half-donuts sitting in there.

All I know is, they said they were good to have, and hard to find. So when I saw some for $50, naturally I bought them.

[Riverman]

I made this sheet up based on what I have learned so far.

[A Fn Noob]

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</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #d4d0c8; WIDTH: 66.75pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=111>HP<O:p></O:p>

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #d4d0c8; WIDTH: 70.9pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=118>RATING<O:p></O:p>

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #d4d0c8; WIDTH: 70.05pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=117>PORT P/N<O:p></O:p>

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #d4d0c8; WIDTH: 85.5pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=143>STARBOARD P/N<O:p></O:p>

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</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #d4d0c8; WIDTH: 70.05pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=117>317848<O:p></O:p>

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</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #d4d0c8; WIDTH: 85.5pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=143>319943<O:p></O:p>

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</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #d4d0c8; WIDTH: 80.8pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=135>1 3/8” CARBS<O:p></O:p>

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Just right click and copy/paste, so people without Word can open it! Are you one of those organizational type people? My notes are scribbled on pieces of cardboard and papers scattered all over the place.

Why dont we just put all the stuff in one spot. Ill gather up my notes into a pile and arrange them in right angles to one another and give them to you. Then you can make some charts and tables. That's right, you are a teacher.... no wonder!

[Riverman]

That's right, you are a teacher.... no wonder!Gearhead first - teacher second! ;)

[BarryStrawn]

I think the chart is wrong. They changed from the good 322864/5 head to the low compression "bathtub" design in 1981.

[Riverman]

Right you are Mr. Strawn. Actually, the parts lists both available for 81. I will change my table.

[A Fn Noob]

Pop quiz on Friday.

[Over-Easy]

I love the Scream and Fly community! You guys are great. I've throw those away before I think. I'm going to have to look around in my junk pile again.

[A Fn Noob]

So... suppose a guy had a '76 135, and he puts those '73 heads on? Then what? What was that guy talking about with the spark plug clearance in that other thread? The original question, what makes them better?

And I'll have to find where I read the whole scoop on the 135. Something about a bolt prone to rusting on the '73, they couldnt find out why they were having failures, started watering down the motors, then they figured out the rusty bolt. Under the bubble. The guy said the 74,75 models are not as good as the original '73, but the '76 was good. I cant recall where I read that & I cant find my notebook.