thread sizes

does anyone have the thread sizes for the block and head ect..? need to tap them ready for new bolts/studs

Sorry Ash keep forgetting to check these taps for you.

The exhaust manifold studs are m10x1.25 and the head bolts are m11x1.25 IIRC. Best to double check though.

nice one bud is this the same for the all models ?

mines a jap tt pre vvti

same as stated above buddy for your year

Nice one guys

I bought some from ebay a while back and they were shite I wouldn't trust them, so just need to find some I can trust now I know the sizes

if its new exhaust studs you can't beat genuine Toyota. Thats what i use in all my builds. there only a few ££ each unit. I buy them in bags of 50.

As for head studs i always throw a set of ARP's in there. For the money you can't go wrong with the extra clamping forces

Tim

if its new exhaust studs you can't beat genuine Toyota. Thats what i use in all my builds. there only a few ££ each unit. I buy them in bags of 50.

 

As for head studs i always throw a set of ARP's in there. For the money you can't go wrong with the extra clamping forces

 

Tim

Sorry to go off topic but here's a question for you Tim, I've reused a set of ARP head studs and they now have a final torque of 90lb/ft. Do they need re-torquing in the future? The guys in the U.S seem to re-torque them after the first X amount of miles.

if its new exhaust studs you can't beat genuine Toyota. Thats what i use in all my builds. there only a few ££ each unit. I buy them in bags of 50.

 

As for head studs i always throw a set of ARP's in there. For the money you can't go wrong with the extra clamping forces

 

Tim

yeah mate i need arp's i wont be running stock twins anymore

yeah mate i need arp's i wont be running stock twins anymore

Are L19's not better head studs than ARP's?

L19 is an ARP, its just a higher spec material than the normal off the shelf ARP material, also alot more expensive. I've used them in the past but you have to be very careful as they actually weaken in the presence of moisture. Very weird material.

You can re-use ARP head studs a couple of times, but i always check there stretch in a relaxed state compared to brand new. If there un-stretched they can be re-used. Typically get about 2-3 times out of them before this happens and they should be replaced. Regarding the re-torquing there are a couple of methods people recommend this being done. Some say to just go over it again with a torque wrench after its had a few heat cycles, but going from my 3sgte experience i have never once had any loosening of the stud or needed any turn to meet its already set torque value. The other method is to loosen them off and retorque, One at a time in the correct pattern but i don't like to do this because its removing a clamping force on the head gasket for a small time then its retorqued. Personally i find this is just asking for head gasket issues.

I can't say 100% on the supra engine as this is still new to me but on all the other toyota engines i've worked on over the years i've never had a head gasket issue or retorque issue after installing them the first time around. So i usually just leave them alone now after there initial installation. Some of the big BHP engines i will just give them a check as for head lift etc, but then its just recheck without loosening and done insitu.

Just my opinion of-course.

Tim

Cheers for the reply Tim, I shall leave them as is in that case. Maybe a quick check if I upgrade the cams at a later date.

yeah just go around in the correct pattern with the torque wrench. Just don't do the loosen them off method before re-torquing.

Tim