Prone to crack?
Thread Starter
Racer
Joined: Oct 2002
Posts: 321
Likes: 0
From: Holland(the Netherlands) Europe
These are crack prone?
I had a question about this phrase:These are crack prone...
I'm building myself another engine and found a 350 with these 76 cc chamber heads...these are crack prone!!!
That doesn't sound good does it?
I'm from Holland,the Netherlands and know the meaning of the word crack,but what does this whole phrase means in layman's terms...
Greetz Erik.
I'm building myself another engine and found a 350 with these 76 cc chamber heads...these are crack prone!!!
That doesn't sound good does it?
I'm from Holland,the Netherlands and know the meaning of the word crack,but what does this whole phrase means in layman's terms...
Greetz Erik.
Last edited by Erik88vette; Jun 17, 2007 at 04:13 AM.
Burning Brakes
Joined: Feb 2000
Posts: 1,246
Likes: 1
Thin, lightweight (well, for iron heads) castings that crack easily. In other words, junk heads.
They don't make good power at all and have small 160cc runners at that. What have you got 462624s? The worst of them all.
They don't make good power at all and have small 160cc runners at that. What have you got 462624s? The worst of them all.
Thread Starter
Racer
Joined: Oct 2002
Posts: 321
Likes: 0
From: Holland(the Netherlands) Europe
Yep,these are the magic numbers....462624 
Thanks for the explanation...
So if I want some higher compression I would have to use flat top pistons with a 12:1 ratio to make it eventually 9,5 or 10:1 with these heads?
Greetz Erik.
Thanks for the explanation...
So if I want some higher compression I would have to use flat top pistons with a 12:1 ratio to make it eventually 9,5 or 10:1 with these heads?
Greetz Erik.
Burning Brakes
Joined: Feb 2000
Posts: 1,246
Likes: 1
just junk the heads, they are not worth using at all..period.
Melting Slicks
Joined: Dec 2006
Posts: 2,669
Likes: 3
From: Kingston Ontario
Prone - 'more than usually likely to suffer'
prone to crack = no surprise when these heads crack
cracking of these heads is the most common noted failure
Do not use these heads, do not use these heads
prone to crack = no surprise when these heads crack
cracking of these heads is the most common noted failure
Do not use these heads, do not use these heads
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Burning Brakes
Joined: Mar 2006
Posts: 1,036
Likes: 2
From: Huntingburg Indiana
The better "heavy casting" heads are flat across the bottom edge except for one little cut-out. The lighter heads that like to crack, are not flat across the bottom edge. They have a cut-out between each cylinder. That is the easiest way to tell.