Originally Posted by TouringAccord

for the intake manifold... use one from either a H23A1 or a F22A6, since you are going turbo though, you'll want the larger plenum of the H23A1.

Originally Posted by GhostAccord

H23 upper plenum w/F22A6 lower.

Originally Posted by Evolution Industries

If you have an F-series motor and want to gain 20-30 horsepower and gain 5-10 more torque without changing internal parts in the motor, Evolution Industries designed an adaptorplate to mount on a stock H22 manifold to the F-series head. A stock 1993 Honda Accord with a F22a motor was used to test the adaptorplate. Baseline pass showed 80.2hp and 117.4lbft at 6364rpm. After installing the adaptorplate with the H22 manifold it made 112.7hp and 130.0lbft at 6364rpm. So a gain of 32.4hp and 12.6lbft.

Originally Posted by GhostAccord

With the F22A6 bottom half there is no modification/fabrication required. It is a direct bolt on. The H23 bottom-2-F22A head requires some fab work IIRC.

Originally Posted by slo2k

if useing the h23 mani. does the f-series waterpump tube work with the h-series. also the thermostat housing. i have found a few build ups that use this and that mani's. some just don't have little detailed info.

i have the a1 intake mani that came on the head. the plenum just looks a little small.

Originally Posted by GhostAccord

https://honda-tech.com/forums/showthread.php?t=2736877

H23 upper plenum w/F22A6 lower.

Originally Posted by project_cb7

i was passing by the forums and droppin to this post.funny you mentioned the evloution project they did with the throttle body plate adaptor.my vehicle was the one they tested it on(or one of the cars they tested if more then one).im running a f22a1,and the 97gen. prelude dohc intake manifold with the adaptor plate.i feel the diff.