Plum 95 engine project

[my1994z28]

Hey guys the stock head bolts are torque to yield (TTY) which means they arent meant to be reused.I have my fingers crossed for you that everything works out..

[ITSSLOW]

I don't even reuse head bolts on junk engines in cars that are worth $700. You're a braver man than I am Larry.

[98blackbeauty]

Hey guys the stock head bolts are torque to yield (TTY) which means they arent meant to be reused.I have my fingers crossed for you that everything works out..

The stock bolts on a 95 are regular head bolts. the torque to yeild bolts were 1st used on 1996 and up. You can identify them by the lack of hardness marks on the head of the bolt. The standard head bolts are harder and have the hardness strike marks. We went through this when we built B's engine. the 1st head was fine, the second head I broke 2 NEW head bolts and I was on 3rd torque pass going from 40 to 65 ft. lbs. Lucky that there was enough jaged edge that I could tap bolt out with a punch and didn't have to drill out and use easyouts. Prior to installing both heads I had run a tap through holes to clean threads.

[DETROITMUSCLE]

wow I think thats a first I have heard of someone breaking brand new head bolts, did you tampon out the holes well enough?

[ITSSLOW]

wow I think thats a first I have heard of someone breaking brand new head bolts, did you tampon out the holes well enough?

What is your mind thinking about today sir?

[meissen]

Hey guys the stock head bolts are torque to yield (TTY) which means they arent meant to be reused.I have my fingers crossed for you that everything works out..

Yeh - like dad said - and I don't even know 100% if it was 1996, I believe it was LS1 that they started using TTY specs.

[Lucky SOB]

What is your mind thinking about today sir?

I was thinking the same! LOLOL

[shawnc16]

maybe he uses a tampon in the head bolt holes to get the crud out?

[c0ncEpT]

Thats what the method for cleaning the head bolt holes is called. You roll up some paper towel and make it look like a tampon and stick it down in the bolt hole to remove any coolant that might have gotten down in there. If there is any fluid left down in the holes you can crack the block when you torque down the bolts...

[98blackbeauty]

wow I think thats a first I have heard of someone breaking brand new head bolts, did you tampon out the holes well enough?

I thought I did. tap spun out easily and I ran a used bolt in and out to make sure it was clean.

[MP81]

Yeah - that's odd they broke...

[DETROITMUSCLE]

yep its just a method for cleaning out the bolt holes, in all honesty Larry I'd be surprised if something else didn't happen when you snapped off those bolts. I have seen an ARP head bolt that someone torqued to tightly (not broke) and they ended up cracking the block.

[LSxDreamer]

The only two things I can think of that they would break is one the bolt had a defect in it or two your torque stick isn't calibrated correctly anymore... have you ever dropped it...

[98blackbeauty]

The only two things I can think of that they would break is one the bolt had a defect in it or two your torque stick isn't calibrated correctly anymore... have you ever dropped it...

17 bolts per head. X2 thats 34 bolts. 32 torqued ok. I do have the old style also and I used that to check the torgue because I thought it was odd when the first on broke.

[meissen]

Meh, so I realized I was being pretty hard on my dad in this thread. While I don't agree with every aspect, I know he's doing what he trusts to be right and he's trying to keep the cost down while also trying to get it back together as soon as possible. We all know if we took any other car to a mechanic all they'd do is replace the lifters and throw it back together. Dad's doing more than that so it's all good. I know he's just really anxious to drive his car again - I felt kinda guilty last night while I drove him around in the Camaro going on about how I missed driving my car for 2 days... he hasn't driven his in a couple weeks.