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there is a hole in my head
Posted: Sat Dec 20, 2014 9:22 pm
by johnny46
Hi all
ok this is a long one so please stick with me and i apologise for my inaccurate wording etc
i am about to fire my engine for the first time in a couple of years and break in my new cam, now we have fired it an had it running very briefly to get the timing right ready to do the break in process <it sounds amazing before you ask> and we have noticed that where the inlet manifold meets the cylinder head there is a hole and it is exhausting out of the hole,this is due to a later manifold being on an earlier engine or the other way round. my friend who did the main work on the engine build noticed this when he was putting it back together but thought it wouldnt be a prob as on his 400 he had a different inlet so didnt blow.
He and i studied and followed rocky rotellas how to build a pontiac 400 and this is where it explained the inlet difference and where we might have a problem, in this book it explains that this hole can be filled with a hi temp expoxy thus stopping the leak.
my questions are, can i fill the hole with everything still intact carb inlet etc as the 1st pic shows or do i have to remove everything to fill the entire hole?
and also has anyone else had this problem and what product did you use to fill the gap?
i will attach some pics
thanks in advance guys
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:30 pm
by johnny46
Pictures of the gap in place
Pic of filler
Pic of filled hole with everything off
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:31 pm
by johnny46
Can I fill the gap with everything intact like bottom pic
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:31 pm
by bhm1712
this should answer all your questions!
http://www.hotrod.com/how-to/engine/hpp ... ederated=1
it can be done.
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:31 pm
by bhm1712
i see you have already found this page!
yes it can be done as the page explains.
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:32 pm
by bhm1712
you would need to fill the entire hole, just filling the exposed part would serve no real purpose as the exhaust gas will find another outlet to get out.
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:43 pm
by johnny46
Ok I can do that not Gona enjoy takin all that back of but what has to be done has to be done. Where can I get something like that furnace cement on a Sunday ? b and q?
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:47 pm
by bhm1712
thats a good question, i very much doubt B&Q sell something so specialist.
You may struggle at the weekend, most of the ones I've just found on google are mail order or from specific specialist shops. Might be a trip out on Monday somewhere!
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:48 pm
by johnny46
Will have a look on Google now n see where I can get one what did you search?
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 9:57 pm
by johnny46
B and q and screw fix have some so will have a run there tomorrow, what would the minimum temp be needed???
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 10:06 pm
by bhm1712
although I'm not sure this is right,
i believe exhaust gas temperature to get up to around around 850 degrees c but not sure how it would be when giving it the beans. I would get the highest temp rated stuff you can.
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 10:19 pm
by johnny46
Can't afford to give it the beans lol
Is that one you have at the moment Ian the white firebird ?
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 10:25 pm
by bhm1712
yes i have that one. Its my first one and only one. Had it for a while now.
It was for sale but it didn't sell so I'm planning on repairing a few more things and maybe trying again in the spring or i may decide to keep it once I've done the heads on it.
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 10:42 pm
by johnny46
Is it completely standard what's the best part of driving it?? It quick enough etc what's up with the heads
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 10:47 pm
by bhm1712
johnny46 wrote:Is it completely standard what's the best part of driving it?? It quick enough etc what's up with the heads
Its not completely standard no, its been de-smogged, has 4 branch headers and true dual exhausts, has a rejetted carb and opened up shaker scoop.
The valve stem seals (o rings) are perished and cracked and so it blows oil smoke out the exhausts after idling or high rpm over run.
its great to drive, pulls like a train.
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 10:59 pm
by johnny46
That doesn't mean much to me lol but I catch your drift nice to hear it pulls well ah yes normal prob for an aged car I can't wait it to get mine on the road still feels like it's just a dream that it will happen but we'll get there in the end should be done by March
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 11:05 pm
by bhm1712
Here she is in action
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 11:24 pm
by johnny46
It's just blank
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 11:25 pm
by bhm1712
johnny46 wrote:It's just blank
should be sorted now I've retyped the link as it was from the youtube mobile site which doesn't work here.
however if your viewing on a iOS 8 mobile device you won't see it as they don't support the embed feature. (iPad/iphone)
Re: there is a hole in my head
Posted: Sat Dec 20, 2014 11:35 pm
by johnny46
iPad
Re: there is a hole in my head
Posted: Sun Dec 21, 2014 12:04 am
by bhm1712
Re: there is a hole in my head
Posted: Sun Dec 21, 2014 12:50 pm
by johnny46
Sounds incredible bet the exhaust note is good!!
Re: there is a hole in my head
Posted: Sun Dec 21, 2014 5:51 pm
by bhm1712
It does sound great!
How did you get on with the furnace cement??
Re: there is a hole in my head
Posted: Sun Dec 21, 2014 10:52 pm
by johnny46
I got some from b and q upto 1250'c and stripped the top and applied it this afternoon so will go back tomo and lightly sand and build it back up and break the cam in, wish me luck
Re: there is a hole in my head
Posted: Sun Dec 21, 2014 11:27 pm
by bhm1712
Good luck dude im sure it will be fine!