I've seen pictures of two CJ7s with 454s, a CJ5 with a 440, and a 8.0 Dodge V10 in a TJ. It can be done. I actually looked at putting a 427 in mine about a year ago but then when gas prices started going up I reconsidered. The problem is having enough room under the hood for fans to keep the engine cool. Also the big block isn't a light engine so the front suspension would need upgraded. It can be done, not as easy as say a 350, but it can be done. I don't want to talk you out of this b/c it is a wild swap.
Do you plan on doing much Hard core stuff?? if so you may want to move the firewall/Dash setup back a few inches (3-4) It'd give more room under the hood, and if the motor, trans, transfer case were all slid back too, it's be better for weight distribution. With a 6, you wont have to worry about rear driveshaft length (tooooo much). Hell this thing sounds awesome... maybe a big ole FAT Blower sticking out the hood.... (nothing quite like having motor showing)SOA on 38" boggers, full width 60's.... Full Cage, AtlasII, 4 Bucket seats, maybe 1/4 eliptical in the rear... AWWWW yeah... Paint it Bright Yellow, and call it the "Rock Limo"
The only problem would be the Comunist Air Research Board.... CARB.. especially in CAli. Do it, even if it is trailered
"If you chose not to decide, you still have made a Choice" RUSH
did i hear BIG BLOCK? now that is what i like to see.. yes i agree.. full width axles.. the whole enchilada.. make some fender flares out of some old semi mud flaps.. that would make it legal.. oh ya!!!!
I had a BB in my CJ-7 (454). She got really hot in traffic and rock crawling (I ran dual pusher fans). My problem was it was an insano 454 with a huge cam. Stay close to stock with it and you should be ok. I went to a 383 stroker....due to the CJ's light weight the power to weight ratio must be close to the same as it has gobs of power or maybe I never really utilized the BB full potential. Go for it!
One thing to consider, on the '71 and earlier CJs, is that the wheelbase, fenders and hood are approx. 4" shorter than the later models. Not much room for the radiator/fans needed to cool a 454 (Not to mention fitting the bigblock!). If you are going to box, rebuild, and bulletproof the frame, extend it so you can use the later model fenders and hood, like those on your CJ8. Just a thought!
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