Quote:
Originally Posted by goodhart
Can you guys use the 6g75 3.8L's or no. That would make some mad TQ!
|
There are some guys using the 6g74 with 6g75 crank and 6g75 mivec heads.
The worry is that the 6g75 service limit for overbore is less than the 6g74 so the block maybe to thin for a serious overbore. A 6g75 crank drops into the 74 block and with an offset piston pin gets it around a 3.8L engine with the block thickness of the 74.
The 6g75 MIVEC SOHC heads seriously outflow the 6g72/6g74 heads (virtually the same in most models), but getting it to fit under the hood on a 6g74 block is a pita.
However, the 6g75 heads on a 6g72 block with an offset ground 6g74 crank should fit easier (12mm shorter). I don't think anyone has done that, but I know if plenty of people that do the 6g74 crank in the 72 block with an offset grind and custom pistons/rods, gets it to a 3.4-3.7L with decent piston speeds.
Just comes down to how much you want to spend. I am leaning towards just a good old 3.1 (smallish overbore on a 4-bolt factory block), unless I come into a money tree ,then I'll do the offset ground 6g74 crank for a "sleeper" 3.5L.
Threaded Mode