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Topic Review (Newest First)
07-04-2008 10:26 PM
Stroke
Quote:
I take it you never broke a head bolt? or any bolt? they feel like a spounge when they are about to break. I only use RTV when and where it`s needed and rather sparingly, to this day I haven`t had any issues. To each of his own, your welcome very much.
LOL Whoa! Since you're asking... I never broke a head bolt, but then I don't reuse them either. Notta, never. I have though broken many bolts, and studs, and stripped many things, including myself. I'm just not a big user of RTV. I cringe at the sight of it, all of those big globs everywhere, like a can of worms.
Quote:
Permatex #2 or #80019 for me
07-04-2008 06:03 PM
v8hed
Quote:
Originally Posted by ImRoyaltyInMyChevy
so what are you exactly asking here? because on sbc's you don't need any kind of sealant on the head bolts so it wont make a difference what someone put on them.
and did you know this 307 when it was running? becasue then you would know how it ran and if anything was leaking from the head gaskets
Sorry, but this is very bad advice. As already stated, the headbolts on the SBC motor enter the water jacket and MUST be sealed. My own engine currently has the heads off (and cam out) and I found RTV on the bolt threads. Bit of a pain cleaning it all out of the bolt holes in the block, but it's certainly not a sign of trouble... just a questionable choice of sealant (but that's a personal choice). I'll be using Loctite 572 with new bolts on reassembly.
07-04-2008 04:23 PM
matt167 When I rebuilt my Ford 200 I6. 2 of the head bolts go into oil galleys. the Motors manual I had said to use RTV sealent on those 2 bolts... to even everything up, I used RTV sealent on all the bolts...

Also, when I had to remove the gas filler neck from my Falcon to weld in a return connection, the gasket got destroyed.. I ran a bead of RTV, let it dry, then bolted it all up. sealed perfectly.
07-04-2008 03:42 PM
DoubleVision I take it you never broke a head bolt? or any bolt? they feel like a spounge when they are about to break. I only use RTV when and where it`s needed and rather sparingly, to this day I haven`t had any issues. To each of his own, your welcome very much.
07-04-2008 02:59 PM
Stroke
Quote:
I`ve used RTV sealant on more head bolts than I can count, still do so to this day. clean the bolts, and when you reuse them if they don`t feel spoungy they are fine
I can honestly say I don't have any real use for RTV. I would never use it on a head bolt, or stud What the heck would be feeling spongy??? The old silicone still on the threads when torquing?

IMHO, there are products better suited for the task than RTV - which is always found somewhere it does not belong. I have found tubs of it over the years, in sump pick-ups, radiators, thermostats, oil galleys, orifices, in the lifter valley, used on intakes as well as throughout the crankcases of various engines, transmission pans/filters, and rear ends. It is not compatible with everything. I have even seen it on lug nuts!!! I hate RTV The 'a little is good a lot is better' mentality seems to be the case with this stuff. Permatex #2 or #80019 for me. JMO

Thank You very much.

Quote:
the only way that it could've gotten there though is from a pretty lousy mechanic who put the engine together last. But that is something to worry about, because who knows what other mistakes he made on the engine that you will find over time

Thank You x 2
07-04-2008 01:29 PM
DoubleVision From past experience when I seen others that didn`t use anything, coolant would make it`s way up the bolts into the heads.
07-04-2008 01:28 PM
ericnova72 Nope, they go into the water jacket, you've got to seal them somehow or you will have a leaker.
07-04-2008 01:06 PM
schnitz I thought you were supposed to avoid using anything on head bolts because it would mess up the torque settings. Was I wrong?

In a while, Chet.
07-04-2008 12:54 PM
DoubleVision Man chet, I`ve used RTV sealant on more head bolts than I can count, still do so to this day. clean the bolts, and when you reuse them if they don`t feel spoungy they are fine.
07-04-2008 12:16 PM
sbchevfreak I'd just clean them off, tap the holes in the block, and put a brush on teflon sealant on the threads when you put the bolts back in.
07-04-2008 10:43 AM
65smallblock I would be more concerned if the threads were NOT sealed. The bolt holes go directly into the water jackets.. There are several different kinds of thread sealer that work just fine.
07-04-2008 06:37 AM
ImRoyaltyInMyChevy oops I messed up when I said that head bolts don't need any sealant, they definitely do, but not RTV lol my bad

and well you can never judge an engine by the mileage. theres definitely some better running 250,xxx miles engines out there then some 50,xxx mile engines. just depends how it was treated and maintained. and also on whose working on it and why.
for instance my dad bought a 78 chevy 3/4 with 55,xxx miles, but what do'ya know, it's a sledge monster and I killed the engine from alot of highway driving .
it was the original old man who owned it, but what happened was he only really drove the truck to work and his work was so close to home the engine never got wormed enough to keep it flowing good and clean.
07-04-2008 06:18 AM
schnitz Oh boy. I had pulled this from an almost 25,000 mile '69 C10 pick-up. It was frame rotted so badly it had to be loaded in multiple pieces. Wouldn't one think that a lower mileage engine wouldn't have ever needed to be that far apart. Makes me wonder what else I'll find....


In a while, Chet.
07-04-2008 06:03 AM
ImRoyaltyInMyChevy well I don't think that is anything to worry about, the only way that it could've gotten there though is from a pretty lousy mechanic who put the engine together last. But that is something to worry about, because who knows what other mistakes he made on the engine that you will find over time.
07-04-2008 05:56 AM
schnitz
Quote:
Originally Posted by ImRoyaltyInMyChevy
so what are you exactly asking here? because on sbc's you don't need any kind of sealant on the head bolts so it wont make a difference what someone put on them.
and did you know this 307 when it was running? becasue then you would know how it ran and if anything was leaking from the head gaskets

I'm asking (primarily) if it's a strange thing to find RTV on the threads to head bolts on a low fairly low mileage engine. I bought this engine over ten years ago, and it's sat waiting for a rebuild for the last number of years. I pulled it when the cylinders would no longer hold any compression (the best was 70psi--and the best with oil over the rings was around 83 IIRC...). I had ran it intermittently for the first years I had it, using it as a "back-up" for a number of vehicles I owned. It ran fine once started, just had low compression, and it would need a few extra cranks to fire up. Sorry for not being clearer, hopefully I did better this time around. Thanks,


In a while, Chet.
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