Pistons - Please

[Jackson1320]

Correct on the 2018+ using the 12mm head bolts, and they also reach down deeper into the block as well.

I don’t really see the head bolts as a factor when deciding on which block to use because any Machine Shop Can Machine your block for the new 12 mm bolts/studs

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[olaosunt]

I don’t really see the head bolts as a factor when deciding on which block to use because any Machine Shop Can Machine your block for the new 12 mm bolts/studs

It will cost you $999 at L&M.

https://lmengines.com/products/11mm-to-12-mm-head-bolts-thread-conversion

 

[sigintel]

I bought a complete 2019, 5.0 GT engine out of a totaled Mustang, with 11K miles. Six bores mic'ed at 3.6620", 2 mic'ed at 3.6622".

Which were bigger?
4,8?
Or
1,5?

 

[Angrey]

It will cost you $999 at L&M.

https://lmengines.com/products/11mm-to-12-mm-head-bolts-thread-conversion

What he said, if you don't care about money, then sure, pick a block and machine it. If you already have a block with 11mm I would understand, but buying a new block, I'd stick with the newest or older generation that have the 12mm bolts (with preference to the newer blocks that have improvements to cooling and reinforcement)

 

[downtoearth1986]

Nice informational thread. I tried reaching out to Reds in CA but is currently out of darton sleeves for gen2 block. Just wondering have anyone on the forum used L&M for sleeving or 11mm to 12mm conversion?

 

[olaosunt]

I had them rebuild an MMR 1500 block that failed (crank broke on turbo car ).
The pistons were trashed but I beam rods were still good . I also had them do the 11 mm to 12 mm conversion . They had to go over bore(original 3.7) a bit so they used custom diamond pistons .

 

[olaosunt]

It’s a “ spare “ now but if I sell the car I would consider selling it .

 

[80FoxCoupe]

You have like 25 engines LOL

 

[olaosunt]

LoL my friend
cant have TOO many engines when your nick name is “coyote killer”.

 

[Jackson1320]

It will cost you $999 at L&M.

https://lmengines.com/products/11mm-to-12-mm-head-bolts-thread-conversion

Any local machine shop can drill and tap the block for 12mm studs. I’ve had it done for free with other machine work. No need to send it to a expensive machine shop. It’s not difficult so I don’t think any competent shop would mess it up. If it was installing sleeves then yeah I could understand sending it off to a coyote Specializing shop. but just to drill and tap Some holes a local machine shops fine

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