Visit The Dirt Forum for More Information

Author Topic:   Dodge motor
Dirt Full Roller

Total posts: 61
posted January 30, 2002 03:28 AM
I was thinking about building a dodge hobby stock motor but not sure what would be good... the rules are open chamber 2.02 heads and stock rods and crank with cast pistons, and 370 cid limit, what do you think would work good?

Dirt Forum Champ
Total posts: 564
posted January 30, 2002 09:47 AM UIN: 25419780
I would go with th dodge 360 or 318.I have herd that the 360 motor it a good power plant..

Dirt Full Roller

Total posts: 37
posted January 30, 2002 11:58 AM
My tow vehicle is a Dodge in the same color sceme and sponser so I would have liked to run a dodge,,, but the problem is in the price SB chevy stuff is cheap and in abundance. Dodge is high always. P.S. If you can afford it do it a 360 is a great engine. I wish i could have.

Dirt Full Roller

Total posts: 45
posted January 30, 2002 01:36 PM
Build a 360. They're great engines for street stock and can be built for the same price as a Chevy small block 400 comparably equipped. I have a couple built of each.

It's preferable to use a '75 or older block because they have thicker cylinder walls. If you don't mind hyperutectic pistons, KB makes a whole bunch for the 360. Have the block decked, use the KB 190's, and mill the heads until you set quench at 40 thousandths. If you prefer forged, you can buy Ross Pistons through for 499 a set.

Any set of pre magnum production 360 heads will do fine, but the pecking order goes like this:
1) 89-91 pre magnum swirl heads, casting number ends in "308." You can buy them outright from Mopar Performance, too.
2) 68-70 340 X heads. Called "X" because there is a big "X" cast in between the spark plug holes. 2.02/1.60 valves. Hard to come by.
3) Early 70's "J" or "O" heads. Some had 2.02's, most of "J's" didn't. Same port sizing as X heads, but with 1.88 intakes.
4) 70's and 80's 360 castings.

You can stumble across J heads all day long in 71 and 72 vans with 360's. Most people overlook vans in junkyards. You safely mill up to 100 thousandth's off stock pre magnum 360 heads. I'm talking straight mill not angle. Try to stay away from the 318 heads as their ports are smaller.

Stock rods (resized with new bolts) and stock cranks work fine below 7,000 rpm. Check with Hughes Engine about cam recommendations, I've also had a lot of success with Mopar Performance's cams. Hughes engines have cam grindings that take advantage of the 360's larger diameter lifter tappets (compared to a small block chevy).

Dirt Freak

Total posts: 230
posted January 30, 2002 06:13 PM
Deek has givnin' you some great info. A point that you need to look close at is the oiling system. There are some tricks to keeping the Chrysler together, I'd have a shop that knows Chryslers put the block together.

Dirt Full Roller

Total posts: 61
posted January 31, 2002 08:39 AM
Thanks for the reply, the rules call for cast pistons... I am curious about the 340. Is the 360 better?

Dirt Full Roller

Total posts: 45
posted January 31, 2002 03:48 PM
The 340's a great engine, but a couple things make a 360 better to run in a hobby stock.

-Torque. Heavy race cars need torque and 360's have more of it. Stroke on a 360 is 3.58 opposed to 3.31 (I believe) on a 340
-Availability. 360's can be found all over the place. 340's are rare. Even if you had one available, it's worth more to a resto guy. And, what if you ruined the block racing it? You'd be stuck trying to scrounge up another one.

Remember that KB's are cast pistons. Hypereutectic is just a process added to a cast piston to give it a higher silicone content.

Back to the Archives