IAG 750 EJ25 Closed Deck Case - 11mm H.S.M.

Bore & Hone - Required Before Final Assembly

Every IAG closed deck case must be bored and honed after the closed deck conversion, because the conversion slightly distorts the cylinder walls. The case starts at the stock 99.5mm bore.

• Yes - Bore and Hone My Block: IAG bores and hones the case to 99.75mm before it ships. This version must be used with 99.75mm pistons. You must purchase or send in your pistons for measurement and sizing if you select this option.
• No: The case ships at the stock 99.5mm bore. Bore and hone to 99.75mm is still required before final assembly and must be done before installing pistons.

What's Included

• (x1) IAG 750 Closed Deck Converted Case Halves - brand new EJ25 case, stock bore 99.5mm (99.75mm bore and hone included only if that option is selected above)
• Machined for OEM 11mm head studs

Power Rating

The IAG 750 Closed Deck Case is rated for 750 BHP.

The Closed Deck Process

IAG performs the conversion in-house on a brand new OEM EJ25 case. The case is CNC machined to accept precision closed deck inserts that support the top of the cylinders, where high cylinder pressure causes the most movement and cracking. The inserts use a cast material similar to the case itself so both expand and contract at similar rates, and they are machined with oil and coolant passages like stock, so coolant flow and cooling are not reduced. Each deck surface is then machined true and flat.