It had a variable intake manifold to optimize torque output across varying engine speeds and engine response. The J25A used a 10.5:1 compression ratio and was a SOHC VTEC design. The J25A was used only in the Japanese domestic Inspire/ Saber models. Some versions were able to turn off one bank of cylinders or one cylinder on opposing banks, allowing for three-cylinder use under light loads and four-cylinder use under medium loads. Initially, the system turns off one bank of cylinders under light loads, turning the V6 into a straight-3.
One unique feature of some J-family engine models is Honda's Variable Cylinder Management (VCM) system. VTEC variable valve timing is used on all applications, with the only exception being the J30AC, which uses Variable Timing Control (VTC) instead. All J-series engines are gasoline-powered, use four valves per cylinder, and have a single timing belt that drives the overhead camshafts. It has a shorter bore spacing (98 mm (3.86 in)), shorter connecting rods and a special smaller crankshaft than the C-series to reduce its size. Unlike the C series, the J-series has never been used in a longitudinal application the J-series was specifically designed for transverse mounting. It is a 60° V6 – Honda's existing C-series were 90° engines. It is built at Honda's Anna, Ohio, and Lincoln, Alabama, engine plants. The J-series engine was designed in the United States by Honda engineers. Why do you think all the other J series motors use 35mm valves?) I would go with J35a3 heads in a heartbeat.The J-series is Honda's fourth production V6 engine family introduced in 1996, after the C-series, which consisted of three dissimilar versions. Believe it or not the 36mm valves were for emissions not for performance. The J35a3 has the best flowing ones, 35mm valves (10% lighter then the 36mm ones and flow better. Also P2R makes all the gaskets for the throttle body and intake manifold, don't forget to pick those up.My Recommendation: AEM Dryflow Filter, Custom Sheet metal Intake, Blox 76mm TB, Custom adapter plate that also acts as spacer, J37 intake manifold, Honda cover plate, every P2R gaskets.The Head, I will break this down to smaller sectionsOk for the head you only have a few options available at this time.Complete Stock Head - The Best stock Head is from the J35a3 or the J32a2. If you still want to use the J32a2 or J35a3/4 manifold to flow like the J37 one, you will need to port it, switch to 2002 acura MDX Velocity stacks. You will also need custom bolts made to bolt it to the motor, (Give me a little bit for the exact specs I have to find them) (I got mine from Bolt Depot for something like $15 shipped).
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