Imusarjat ei muistaakseni käy, voin maanantaina verrata ainakin 258:n kantta (on irrallaan -85:sen kansi, tosin sekin on eri kuin 70-luvun kansi) ja H.O.-koneen imaria, sellaisiakin on irrallaan, Renixin imusarja on myös eri kuin H.O:n, joten kumpaa kantta tarkoitat, 87-90 on Renix ja 91-99 on H.O. ja 00-06 on suorasytytyskansi... Ja 258:n kannet eroaa kanssa ainakin 75-80 on eri jako sarjoille ja venakopalle kuin 81-90.

Aijuu, olihan tuossa tuo -92 H.O.... Tuli vielä mieleen että kansipultitkin saattaa erota, kun 75-80 on paksummat kuin 81-90, jossa muistaakseni on 1/2" pultit ja vanhemmassa siis paksummat....

Aika selvä ohje löytyi maailmalta. Pitäisi olla nuo vanhemmat 1/2" kansipultit, 4,0 kannetiiviste, 4,0 kannen ylimääräiset vesireiät betonoidaan umpeen. 258" imari menisi sovittamalla, siis pientä viilailua ja 4,0 pakosarja sopisi?  Jos oikein kääntelin tekstiä??

What year is the 258 block? If its not 80-83, you should already have the 1/2 inch head bolts.
What type of Jeep do you have the engine in? If its a full size, the 4.0 intake will not fit because of the big power brake booster.
Also trying to modify the 4.0 intake for your projection might be a bit involved if your not a real good fabracator.
The 4.2 intake will fit on the 4.0 head, like in the picture above, you will need to mount the intake above the little head intake studs. You grind a little off the bottom of the intake stud holes and keep test fitting untill you get a good cover of the intake ports, grinding a little at a time. You will also need to use the 4.2 intake gasket, this has a little more gasket than the 4.0 gasket and will seal better.
Once you get all that fitting real good, you will either need to get larger washers (also seen in the above picture) for the intake bolts or make your own. The little 4.2 bolt "washers" will not be large enough to hold the intake and exhaust. You can use the larger dia. washers with the rest of the 4.2 hardware to mate everything up.
As you have read in all the write ups on the net, you must use the 4.0 exhaust manifold or get a header for the 4.0. What they don't tell you is that you also need to get the "cross over" pipe for the 4.0. Thats the part of the exhaust pipe that connects to the 4.0 exhaust manifold goes under your tranny then down the passenger side to a cat. You can get it at a yard or I got mine from a-zone for about $35.00
The biggest thing is the extra water ports that are in the 4.0 head. Some people close these with J-B Weld then file down or get the head "decked". You can also weld them closed or have 3/4 inch freez plugs machined into them. Then again, I have found a few AMC car sites that have not tried to close these water ports at all and just used the 4.2 head gasket instead of the 4.0 head gasket to seal the ports. Kind of like some Chevy engines, if you have good solid metal on the block where the water ports are on the head, a good head gasket and new head bolts will keep the ports closed themselves. The few AMC guys that have done this have been running their engines for 1-2 years and a few thousand miles without any problems.

sj.hero kirjoitti 15.10.17 klo 15:31:42:
On ne erit, Renixissä korkeammat imukanavat, pulttijako täsmää, mutta jos H.O:hon laittaa Renixin imusarjantiivisteen, tulee imuvuoto korkeamman imukanavan reiän takia! Pakosarjat on näköjään pienillä muutoksilla soveltuvat ristiin....

Kannessa nuo reiät.