supra head gasket questions+ rebuild

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

Andy C · 05-03-2008, 11:56 AM

i need to tap my block as the studs arent going all the way in but i dont know what thread size is on the arp head studs i bought does anyone know what tapping tool i need please.

Bill UK · 05-03-2008, 01:15 PM

Use one of your old head bolts grind 3 or 4 vertical slots in the bolt (Dremel tool cutter works well) and clean off any burrs. It can work better than a tap because: It is softer and wont remove too much metal; aswell as not being tapered it will clean out to the bottom of the hole.

Bill UK · 05-03-2008, 01:39 PM

Done a bit of research Andy, It seems the extra stud length is not unusual for some reason. The threads are 12mm x 1.25 pitch.

05-02-2008, 08:33 PM	#1
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, 10:17 PM	#2
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	#3
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	#4
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

05-03-2008, 11:56 AM	#5
Andy C 3" Exhaust Join Date: Apr 2008 Location: sudbury suffolk uk Posts: 68	i need to tap my block as the studs arent going all the way in but i dont know what thread size is on the arp head studs i bought does anyone know what tapping tool i need please.

05-03-2008, 01:15 PM	#6
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Use one of your old head bolts grind 3 or 4 vertical slots in the bolt (Dremel tool cutter works well) and clean off any burrs. It can work better than a tap because: It is softer and wont remove too much metal; aswell as not being tapered it will clean out to the bottom of the hole.

05-03-2008, 01:39 PM	#7
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Done a bit of research Andy, It seems the extra stud length is not unusual for some reason. The threads are 12mm x 1.25 pitch.