MHG fresh block opinions

[IndigoMKII]

I've got a brand new long block available to me. I'm wondering if I should 1) just bolt everything together with the OEM HG torqued to 75 ft-lbs 2) Pull the head and install a MHG with ARP head studs torqued to 85 ft-lbs. (Since it's a brand new head/block will they need to be machined? I know normally they need to be machined but am not entirely sure on this.)

I do eventually plan on building this engine for 500-600 rwhp.. but would like to drive it around at around 300rwhp-ish till I have the money/time to build the engine for it.

Opinions are appreciated and thanks in advance.

 

[hvyman]

Brand new as in from Toyota? Or rebuilt?

 

[Nick M]

Once the head is bolted on, the deck is slightly deformed. It still needs to be polished for the MHG. A good composite like the new OEM or a Permatorque from FelPro can handle quite a bit of power. Just not detonation. And on the other hand if you have detonation, better to push out a gasket the destroy a piston.

 

[IndigoMKII]

Brand new as in from Toyota? Or rebuilt?

Brand new as in brand new.. Not a mark on the cams.. Or buckets.. Nothing. This head/block has never seen fuel/spark. I'm asking this because I don't want to push this engine only to have it blast a rod through the block etc etc.. Or destroy something because of a premature BHG while it's running around 300rwhp.

---------- Post added at 02:47 PM ---------- Previous post was at 02:44 PM ----------

Once the head is bolted on, the deck is slightly deformed. It still needs to be polished for the MHG. A good composite like the new OEM or a Permatorque from FelPro can handle quite a bit of power. Just not detonation. And on the other hand if you have detonation, better to push out a gasket the destroy a piston.

I'd be running maft-pro with the 3.5 bar map sensor as well as a wideband to make sure I'm not getting detonation. lex afm/550cc's/ct26@12psi/full 3" exhaust/DM IC/hardpiping kit/apexi intake

 

[Nick M]

I don't use the MAFT-Pro, but from what I have read about it on this site, the only thing holding it back is the people.

 

[IJ.]

Surface finish from Toyota on both my new head and block were fine for a MHG.

 

[Nick M]

Surface finish from Toyota on both my new head and block were fine for a MHG.

When you bought yours, was it a long block, or did you buy a shortblock and head?

 

[IndigoMKII]

When you bought yours, was it a long block, or did you buy a shortblock and head?

^wondering that as well. Because like I said.. Mine is brand new.. Just trying to decide whether I want to pull the headgasket and replace it with a MHG+ARP studs or.. Just tighten the head bolts in it now to 75 ft-lbs.

 

[hvyman]

Block should be fine as long as you use the loosening and torquing sequences. Check both with a straight edge after removing. Head you can always just get machined if its out os spec.

 

[Nick M]

If he bought a long block, I was wanting to see the disassembled pictures. I trust him if he says it is good to go. Most don't do what he did.

 

[IJ.]

Bare block and head.

 

[IndigoMKII]

So then retorqueing the head bolts to 75ft-lbs on the OEM HG will hold 300rwhp until I can build the block/head?

 

[Nick M]

Surface finish from Toyota on both my new head and block were fine for a MHG.

I looked at your pictures today. They do look good straight from Toyota city.

 

[IJ.]

I looked at your pictures today. They do look good straight from Toyota city.

Yep looks to be a ground finish rather than one done with cutters

 

[CyFi6]

Yep looks to be a ground finish rather than one done with cutters

Skip to around 2:15

[video=youtube;R0gE0D95gOA]http://www.youtube.com/watch?v=R0gE0D95gOA[/video]

Granted it is a 2j but I bet the 7m was no different.

 

[IJ.]

That be one kick arse Surface grinder!!

 

[Typhoon]

Skip to around 2:15

[video=youtube;R0gE0D95gOA]http://www.youtube.com/watch?v=R0gE0D95gOA[/video]

Granted it is a 2j but I bet the 7m was no different.

I like that this video shows the sand mould preparation process. If people look closely, they can see what welch plugs actually do, and that is cover the holes where the inner pattern for cylinder liners is held in place and to allow moulding sand removal, NOT for freeze protection.:nono:
But the "freeze" plug myth will persist forever.

 

[CyFi6]

That be one kick arse Surface grinder!!

The next tool you need to add to your list

 

[toyotanos]

Don't tempt him... He would make the next generation of Supra engines out of the shed, which would make me a very very poor fellow