supra head gasket questions+ rebuild

Bill UK · 05-02-2008, 07:42 PM

Bloody hell! That’s over an inch longer; if it screws in to the same depth or deeper than the old bolts then I would think that’s OK. The strange thing is why have they made them so long, perhaps they are used on other car engines like the Mk IV or Skyline. I can’t image any one needing to fit a 30mm thick head gasket. Providing they go in as deep as the old ones, I can't see a problem, providing they clear the camshaft at the top. Is there any one else on the forum that have used studs that can give some input.

Bill UK · 05-02-2008, 07:51 PM

Just thought of something Andy, how will you tighten the nut up if the stud sticks up by 30mm? a standard socket may not fit over the top unless you try a long reach one.

Bill UK · 05-02-2008, 08:08 PM

Another question Andy; is there enough thread left at the top to tighten down the head, I would think you would need a minimum of ? inch or more to be safe.

Andy C · 05-02-2008, 08:33 PM

none of them go in to far just a couple stick up i tried a 3/8 14mm 12 pt socket and it only fits on about 8 i would say. was thinking of replacing old bolts in replacement to the ones i cant work with (arp)

if i turned the studs upside down that will give me a bit more thread on nut as there longer thred on one side.

cant believe im in a pickle already.

also im a bit worried as i was tightened the head studs quite a bit with a 5m allen key dont think i should of done that though the studs alone cant torque the head. this is just what i heard .

Bill UK · 05-02-2008, 10:17 PM

The hole in the head is only a clearance hole, and should have no effect on compressing the gasket if the stud is over tightened. I think they suggest finger tight to allow for the stud to rotate slightly when tightening up the nut. Otherwise if the stud was screwed in firmly into the block and the stud rotated causing it to tightened up even more, the stud would be difficult to be removed using a small 5mm allen key. Using a mixture of old bolts and new studs doesn’t sound a good idea. Read this http://www.aa1car.com/library/2005/eb70536.htm
I know there's a lot or recommendation to use ARP studs, but there is also a lot of Supras that have had BHG repaired using stock Toyota head bolts.The set of APR studs you have don’t sound if they are for a 7M engine. As I said “this is the most critical part of the engine I wouldn’t take any chances”

supramacist · 05-03-2008, 12:50 AM

A deep well 14mm and you'll be good.

You guys are making some of this more tough than it needs to be.

Andy C · 05-03-2008, 04:27 AM

thtas what i have a deep wall 12 pt socket 3/8 14mm.
doesnt fit on all of the cams get in the way

05-02-2008, 08:33 PM	#4
Andy C 3" Exhaust Join Date: Apr 2008 Location: sudbury suffolk uk Posts: 68	none of them go in to far just a couple stick up i tried a 3/8 14mm 12 pt socket and it only fits on about 8 i would say. was thinking of replacing old bolts in replacement to the ones i cant work with (arp) if i turned the studs upside down that will give me a bit more thread on nut as there longer thred on one side. cant believe im in a pickle already. also im a bit worried as i was tightened the head studs quite a bit with a 5m allen key dont think i should of done that though the studs alone cant torque the head. this is just what i heard . Last edited by Andy C; 05-02-2008 at 08:36 PM.

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05-02-2008, 07:42 PM	#1
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Bloody hell! That’s over an inch longer; if it screws in to the same depth or deeper than the old bolts then I would think that’s OK. The strange thing is why have they made them so long, perhaps they are used on other car engines like the Mk IV or Skyline. I can’t image any one needing to fit a 30mm thick head gasket. Providing they go in as deep as the old ones, I can't see a problem, providing they clear the camshaft at the top. Is there any one else on the forum that have used studs that can give some input.

05-02-2008, 07:51 PM	#2
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Just thought of something Andy, how will you tighten the nut up if the stud sticks up by 30mm? a standard socket may not fit over the top unless you try a long reach one.

05-02-2008, 08:08 PM	#3
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Another question Andy; is there enough thread left at the top to tighten down the head, I would think you would need a minimum of ? inch or more to be safe.

05-02-2008, 10:17 PM	#5
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	The hole in the head is only a clearance hole, and should have no effect on compressing the gasket if the stud is over tightened. I think they suggest finger tight to allow for the stud to rotate slightly when tightening up the nut. Otherwise if the stud was screwed in firmly into the block and the stud rotated causing it to tightened up even more, the stud would be difficult to be removed using a small 5mm allen key. Using a mixture of old bolts and new studs doesn’t sound a good idea. Read this http://www.aa1car.com/library/2005/eb70536.htm I know there's a lot or recommendation to use ARP studs, but there is also a lot of Supras that have had BHG repaired using stock Toyota head bolts.The set of APR studs you have don’t sound if they are for a 7M engine. As I said “this is the most critical part of the engine I wouldn’t take any chances”

05-03-2008, 12:50 AM	#6
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	A deep well 14mm and you'll be good. You guys are making some of this more tough than it needs to be.

05-03-2008, 04:27 AM	#7
Andy C 3" Exhaust Join Date: Apr 2008 Location: sudbury suffolk uk Posts: 68	thtas what i have a deep wall 12 pt socket 3/8 14mm. doesnt fit on all of the cams get in the way