Early Vs Late 7M Blocks

[rwdanthony]

wow great thread, didnt know there were so many differences!

 

[HIGHHIGHLANDER]

thanks for info good to know

 

[IJ.]

Very welcome guys!

 

[Skeezix]

So when did they start putting squirters in the GTE? Because the one I pulled from my 87 doesn't have them. What could this mean?

 

[IJ.]

Some 87's had them (the posted Light Block is an 87)

Have heard from a few guys that some didn't though, might have been a running change/hot climate thing like Aussie NA's had Oil Coolers.

 

[Dani87x]

Great thread! As for the oil squirters, would there be any performance difference if it wasn't present as opposed to a block that has them?

 

[SupraSean]

I Had a 87t block that didnt have squirters

 

[Nick M]

that people are going to do what they're going to do...

Not a gen y MA70 owner. Surely you jest.

 

[IJ.]

Great thread! As for the oil squirters, would there be any performance difference if it wasn't present as opposed to a block that has them?

7M's have enough cooling issues as is without adding thermal load, for an occasional high output engine you can get away with no squirters but I see them as an integral part of the cooling system as they pull a lot of heat away from the pistons and may raise the detonation threshold and increase power potential.

Not a gen y MA70 owner. Surely you jest.

LOL not in this case

 

[CyFi6]

I didn't see it mentioned here but from what I have seen I am fairly certain that the light blocks have two large allen plugs at the left rear of the block whereas the heavy blocks have two small core plugs in their place. I've never seen a heavy block with those allen plugs nor have I ever seen a light block with core plugs in that spot.

 

[hazee]

why for the group A racing supra did they use N/A 7m blocks?

 

[IJ.]

Thicker/Stronger casting that was available earlier than the GTE one, they also ran with no Squirters and fully grooved main bearings.

 

[Insidious Surmiser]

its an ma70 and it has the old style block and 6m crank

my '89 had a 6m crank as well... not sure about the block though that thing was HEAVY (still probably was the old one)

it was a MA70... 5spd turbo from the factory

 

[RogueCustoms]

I'm in the process of rebuilding right now... I really really needed this thread. Thanks all.

A question. For Ij. or anyone really.

Which would you consider better. Heavier 7m block and 7m crank or some variation of the lighter block and 6m crank?

 

[IJ.]

Personally I used the heavy block with a lightened 7M crank, AWESOME Combo!

 

[tyang82]

how do you lighten the 7m crank Ian?

 

[AJ'S 88NA]

You can have it knife-edged, what I have and it is 5 pounds lighter than stock.

 

[IJ.]

how do you lighten the 7m crank Ian?

Stock

Lightened

 

[RogueCustoms]

Click here to view the original image of 800x337px.

Doesn't that change the strength of the crank?? And, what dis something like that cost?

O, you're from Down under... Prices probably will be different...

ANYONE ELSE HAD THEIR CRANK KNIFED?? (Lol)

 

[AJ'S 88NA]

Click here to view the original image of 800x337px.

Doesn't that change the strength of the crank?? And, what dis something like that cost?

O, you're from Down under... Prices probably will be different...

ANYONE ELSE HAD THEIR CRANK KNIFED?? (Lol)

Doesn't weaken the crank. Yes I do, can't remember how much it was I bought a lot of other things.

Looks to be around $800 thru IPP performance Parts for a stock crank and the knife edging that's with bearings I believe.