precision block decking registering from the mains, both halves cut simultaneously allowing for the least amount of material removed.
thicker insert in critical area
"less expense compared to sleeving"
"no sleeves to drop"
"superior heat transfer"
"new closed deck case halves in stock
perfect for high HP DD's, no possible engine removal due to sleeve issues
proven torture test for over two years as noted in Nasioc
If you are looking for 750+ HP the V4 Closed deck is HIGHLY Recommend by Outfront motorsports as well as Aw Designs
The Difference Between the V3 Closed Deck and V4 Closed Deck:
The Outfront V3 Block has enjoyed the longest and most successful performance in the Subaru OEM High Performance arena to date, circa 2012, surpassing all other competitions and expectations. So then why produce a V4? With Subaru motors now surpassing the 1000HP mark, the request was, how can we make it even stronger? Outfront's answer is the V4 block. The difference is the thickness of the insert. The V3 block has an insert that is approximately .400" thick. Note that the factory semi closed deck bridge is only about .300" thick. The V3 insert does not affect cooling. There are some known weak areas of the OEM block when subjected to high boost levels, the V4, then reinforces those areas even more by having the insert further into the block, they however, still kept the majority of the insert as thin as possible to aid in cooling. Get the best of both worlds!.The "thinnest" insert that gets the job done is the right approach to the design and allows for best cooling of the block. With the introduction of the V4 in 2015