what kind of thread sealer to use for head bolts?

[img]/phpBB/images/smiles/icon_cool.gif[/img]the lower row of bolts do go into the coolant passages on my 67 block 289, and on my old 66 289 also. the upper bolts though did not.
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On 2005-06-15 13:49, rbohm wrote:
[img]/phpBB/images/smiles/icon_cool.gif[/img]the lower row of bolts do go into the coolant passages on my 67 block 289, and on my old 66 289 also. the upper bolts though did not.
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No they do not. The only ones that had head bolts that screwed into water were 5.0 blocks. You are mistaken.
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I'm not sure if the lower bolts go into water jackets or not, but I've never used anything on the headbolts but 30w oil, and I've never had a leak.
I've got a spare early 289 block I have stored away I can check just for the hell of it.
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Trick flow recommended the 3H aviation non hardening on any bolts entering the water jacket. My son's 94 HO needed it however my 69 302 as far as i recall did not .
[img]/phpBB/images/smiles/icon_rolleyes.gif[/img]

Thanks guys.I just put some light oil on the threads and torqued them down.I've never had any troubles before but the book got me thinking...Rcode whats with the rolly eyes all the time?[img]/phpBB/images/smiles/icon_confused.gif[/img]
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On 2005-06-15 14:36, n2omike wrote:
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On 2005-06-15 13:49, rbohm wrote:
[img]/phpBB/images/smiles/icon_cool.gif[/img]the lower row of bolts do go into the coolant passages on my 67 block 289, and on my old 66 289 also. the upper bolts though did not.
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No they do not. The only ones that had head bolts that screwed into water were 5.0 blocks. You are mistaken.

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I'm going to call you on that and tell you that 351w blocks lower head bolts DO pass through water jackets.
No only that but I bought new ARP head bolts for my 351w and the instructions said to use sealer on the lower bolts and 10w-30 on the uppers.

ARP makes a good sealant, but good ol fashioned pipe dope with teflon works well - the ARP stuff was almost identical. I remember the world heads (at least my Roush 200's) recommended sealer for the rocker arm studs because a couple went through to the intake runners.

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I'm going to call you on that and tell you that 351w blocks lower head bolts DO pass through water jackets.
No only that but I bought new ARP head bolts for my 351w and the instructions said to use sealer on the lower bolts and 10w-30 on the uppers.

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This is a generality that certainly does not apply to all blocks.

I have both a 70' and an 89' 351w block and neither goes to the water jacket. I had the impression that the 89' block would strike water but my observation (and that of my machinist who pressure tested the block) showed they were blind. Both are put together with oil.

Of course my 89' (E9AE) 351w is a service replacement block (factory new machined block with cam bearings and plugs installed) and maybe it is different than production blocks???? It has one other apparently odd feature in that it had the clutch pivot boss cast on it whereas I was led to believe that it shouldn't. This worked in my favor though since I run a toploader. [img]/phpBB/images/smiles/icon_spin.gif[/img]

_________________
Dennis

65' Stang--393 stroker, Toploader 4 spd, 9" 3:50 rear.

Victor Jr. knockoff heads, 282S cam, Stealth intake, Bigs Stage 5 750DP, Accufab headers, Scattershield, Caltracs.



<font size=-1>[ This Message was edited by: dennis111 on 6/16/05 5:23pm ]</font>

I just pulled a 289 out of a 68 Torino, &amp; the block is in the back of my pu. No bolt holes are in to the water jacket.
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I wonder why the Chiltons, the installation notes on the World Products heads I put in, and assorted other tech articles I read during the rebuild, say that the lower bolts need sealant cause they enter the water jacket?
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