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Question - have you gotten o-rings installed on a 6.5? What has your experience with them been? Good, bad? Did you groove the block or the heads? What wire material did you use, copper or steel? What gasket did you use - Mahle, Fel-pro, Cometic? 0.010" thicker, or stock? What were the...

Hey can someone please mail me an eBay purchase? The seller won’t ship to Canada. I would have it sent to you and PayPal you to mail it to my Canadian address. Pm me thanks

Installing the one piece rear main seal is difficult without tool J-39084, because the back of the crank sticks out past where the installed seal is supposed to go. Here's what I rigged up if anyone else is looking for ideas. No idea how anyone else does it, this is just what I impatiently...

https://bulletproofrearsteer.com/?fbclid=IwAR1ksGFwKGdiIsgyIb5n8hyKFJxtuAKTVZpZYUeti_HgJwQTITOfcjZ-ihE anyone see this product before? Looks pretty sweet!

Hey moderators and admins, first off, thanks for everything you do around here! Can we please have the maximum file attachment size increased? The current limit of ~1.5MB limit is very small (an email for example can hold ~25MB attachments). 1.5MB is about the same capacity as a 3½" floppy...

How to identify a block casting date on a stock "numbers matching" GM 6.5 diesel truck without removing or moving anything: Tools required: Flashlight and a Smartphone. Time required: 5 minutes first time. ~2 minutes every time after. Climb under the hood with flashlight in right hand...

Just read some interesting papers from India on air-air intercooling, water-air intercooling, and refrigerant-air intercooling. Under high engine RPM and moderate load, increase in air density across the heat exchangers was ~43%, ~75%, and ~160% respectively. The effectiveness of the air and...

Anyone try Irontite Ceramic Motor Seal before? Thoughts / experiences? http://irontite.com/ceramicmotorseal/ Reducing the roughness of a surface lowers the thermal conductivity of the surface because the area in contact with liquid is decreased. Imagine removing cooling fins from a...

Stanadyne Service Information Online (SSI) - Bulletins and O&I Manuals for General Motors Products: Applies to 4.3, 5.7, 6.2, and 6.5 litre diesel engines utilizing Stanadyne products. List of Bulletins: https://www.stanadyne.com/dealerportal/ssi_service_fr.php Letters, Parts and Service...

Found this on classifieds, any red flags or should I snatch it? "Stanadyne injector pump for 99 6.5 turbo diesel I bought this stanadyne injector pump for my truck. Turned out it was more serious than the pump.... so never used it. Cost me 1700.00 [cad] will let it go for 750.00 [cad]. I had it...

Picked this up last week from Houston, TX: Let me know if you see any red flags. This motor looks like it was slightly used and got a touch up coat of paint. I paid a used price for it. The seller said they acquired it when buying out another company and it came along with an...

If anyone lives north of Houston, I'm hoping they could take a trip to Conroe/Woodlands area to inspect a crate motor I may buy. So I don't pay freight to Canada and realize it's not what the seller said it was. Would pay for the gas & time round trip. Thanks.

I may have an optimizer block to sell next month. It is being honed and inspected for cracks right now including crank deflection. The heads passed inspection and pressure testing. No paint. Proof of inspection will be provided. Can complete the rebuild and sell the long block for $4200 USD...

I'm curious if anyone here could hitchhike a 6.5 crate motor from Arizona to Montana or Idaho. If someone would be making the trip anyway in the next couple months. Looking to cost share on a commute you would be making anyway.

The stock 6.5 rocker is held in place by a nylon button. I had one break on me, now I'm replacing the piston rings in cylinder 6 because of it. No way I'm putting nylon in again. I could have gone with expensive HS roller rockers, or the bolt method, but I thought I'd try something similar to...

P400 heads, cranks & rods, rod bearings, and standard size pistons are all still available. For now. If one already had a 2001+ optimizer 6500 longblock, could they refit it to be on par with a p400? From what I know, you would need: A bedplate, custom CNC'd from scratch to fit a vanilla...

I'm leaving the "silent majority" to actually participate in the forums. The 6.5 community here is great, and discussion / knowledge sharing betters every build. I'll post pics of my 6.5TD/GMT400 project work under the appropriate topics so others can provide feedback or get inspired...

At least with the redesigned water pump (251603), left/right coolant flows are 50/50 balanced. But a pump redesign won't change a front/back flow imbalance. At least I think that's why the back runs hotter and #8 is the typical fail cylinder (with #7 as a close second). I see little...