Outer head bolts go thru water jackets??

Capri306 · 08-31-2001, 02:19 PM

According to Haynes, Chilton's, and even the Ford book, you must use thread sealant (outer bolts only) on later model 5.0's. Why wouldn't you even if it WAS just a mild insurance policy? Haven't any of you guys looked into the bolt holes on a 5.0 block? There's the water jacket right there! Hence the rust on some bolts when removing the factory originals. Even when using studs I would highly recommend sealant, and NOT RTV. That stuff is pure evil IMHO, and has absolutely no place in a well-built engine...unless you like gasket failure as stated above.

The ARP stuff is the way to go. In some racing applications, they are using what's called Hylomar for head bolts, but then again they're only used for one run then thrown out. I'd call up Permatex before using that or the PST they manufacture. But why risk it? Just use the ARP stuff.

------------------
Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch

Thread Tools
Show Printable Version Email this Page
Display Modes	Rate This Thread
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode	Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Only 3 bolts holding fan to water pump?	Hethj7	Windsor Power	5	03-27-2003 03:26 PM
Lower head bolt's ?????	vande97	Windsor Power	2	03-27-2002 08:12 AM
question for people using aftermarket head bolts?	Mach 1	Windsor Power	10	02-18-2002 02:30 AM
head bolts	matt cook	Windsor Power	8	03-16-2001 05:00 PM
Head bolts	stanger8172	Small Ponies	1	11-27-2000 01:41 AM

08-31-2001, 02:19 PM	#11
Capri306 Moderator Join Date: Sep 1998 Location: Grand Rapids, Michigan, USA Posts: 1,001	According to Haynes, Chilton's, and even the Ford book, you must use thread sealant (outer bolts only) on later model 5.0's. Why wouldn't you even if it WAS just a mild insurance policy? Haven't any of you guys looked into the bolt holes on a 5.0 block? There's the water jacket right there! Hence the rust on some bolts when removing the factory originals. Even when using studs I would highly recommend sealant, and NOT RTV. That stuff is pure evil IMHO, and has absolutely no place in a well-built engine...unless you like gasket failure as stated above. The ARP stuff is the way to go. In some racing applications, they are using what's called Hylomar for head bolts, but then again they're only used for one run then thrown out. I'd call up Permatex before using that or the PST they manufacture. But why risk it? Just use the ARP stuff. ------------------ Capri306, Moderator, The Mustang Works Online 1979 Mercury Capri, 5.0L -- C4 -- 2.73 1987 Mustang LX Notch