Re: DYNOED 4.0 head on a 4.2 block
A 390 Holley is to close to the stock size . It does not allow the 4.2 to breath well . Mine is a 600 vacuum secondaries . I can stomp the go pedal to the floor with zero bog from a dead idle . It pulls pretty hard and people think I have a v-8 . The cam is totally streetable . People have written to me about it being a mud bog motor and a trail rig only . I drive it on the street and any trail with zero hic ups . Also about the flooding problem with the Carter BBD , my holley does not do this . Honestly I was worried about it because my suspension is so stiff when off road and well on road to . I have never jumped the Jeep and never plan on it and it might flood out then if jumped . My motor pulls like 15 inches of vacuum at 875 RPM . That is close to stock .