Horsepower - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > Horsepower

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineBrand New! Quadratec LED Headlights!New Vendor - ARTEC Industries Battery Mounts

Reply
Unread 07-04-2013, 04:13 PM   #1
LeePrather
Registered User
1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 619
Horsepower

I have a 78 cj5 with a 304 and a 600cfm Edelbrock...I want to beef up the hp but don't want to upgrade to the 360 or 401. What's the advice? It's just for fun, no racing...

LeePrather is offline   Reply With Quote
Unread 07-04-2013, 04:41 PM   #2
swatson454
Mall-crawlin' Hot Rodder
 
swatson454's Avatar
1983 CJ7 
 
Join Date: May 2009
Location: Dripping Springs, TX (soon)
Posts: 4,868
I suppose the question is how far are you willing to go?

Most here will tell you to scrub the 304 but whose actually spent some time to work with what's already there?

Are you able to clean up the ports in the head? I don't mean a full-blown porting job but can you run a grinder or dremel with some skill?
Are you opposed to shelling out a few extra bucks for a cam that's ground for those little valves?
Machine work: Is this a full rebuild or a bolt on kind of deal?

What are your thoughts?


Shawn
__________________
Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is online now   Reply With Quote
Unread 07-04-2013, 04:48 PM   #3
LeePrather
Registered User
1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 619
I'm open to just about anything. I just bought this in march and it has a 304 that was original to this jeep. It's in great shape and was recently rebuilt. Buying a 360 would cost me 5 grand and a 401 8 grand. Since this is for playing, I'd be more interested in maximizing what I have. I haven't looked into anything yet, but I would like to get the most bang for my buck?
LeePrather is offline   Reply With Quote
Unread 07-04-2013, 04:52 PM   #4
John Strenk
Moderator
 
John Strenk's Avatar
1976 CJ5 
 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 13,007
You can buy a used 360 for thousands less. Find an old truck with a 360 or 401 and maybe only pay $500 for the whole thing. If you can drive it home, you know you got a good engine that will give you more torque and hp than a 304 can make for $500.
John Strenk is offline   Reply With Quote
Unread 07-04-2013, 04:54 PM   #5
LeePrather
Registered User
1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 619
Quote:
Originally Posted by John Strenk
You can buy a used 360 for thousands less. Find an old truck with a 360 or 401 and maybe only pay $500 for the whole thing. If you can drive it home, you know you got a good engine that will give you more torque and hp than a 304 can make for $500.
What vehicles should I be looking for to get those engines? Wagoneer?
LeePrather is offline   Reply With Quote
Unread 07-04-2013, 04:55 PM   #6
John Strenk
Moderator
 
John Strenk's Avatar
1976 CJ5 
 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 13,007
yes and I think J-20 trucks...
John Strenk is offline   Reply With Quote
Unread 07-04-2013, 05:13 PM   #7
swatson454
Mall-crawlin' Hot Rodder
 
swatson454's Avatar
1983 CJ7 
 
Join Date: May 2009
Location: Dripping Springs, TX (soon)
Posts: 4,868
Let me know if you want to pursue 304 mods or just swap out to a bigger engine.


Shawn
__________________
Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is online now   Reply With Quote
Unread 07-04-2013, 05:34 PM   #8
LeePrather
Registered User
1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 619
Quote:
Originally Posted by swatson454
Let me know if you want to pursue 304 mods or just swap out to a bigger engine.

Shawn
Help me out with 304 mods please! I'm looking for a steal on a 360 or 401, but I'm not finding anything...
LeePrather is offline   Reply With Quote
Unread 07-04-2013, 05:34 PM   #9
iluvcowjuice
Registered User
1979 CJ7 
 
Join Date: May 2010
Location: Olney, MD
Posts: 508
You can also look at javelins
iluvcowjuice is offline   Reply With Quote
Unread 07-04-2013, 06:20 PM   #10
swatson454
Mall-crawlin' Hot Rodder
 
swatson454's Avatar
1983 CJ7 
 
Join Date: May 2009
Location: Dripping Springs, TX (soon)
Posts: 4,868
Well let's evaluate your current engine. How's the hot, idle oil pressure? Have you run a compression check?

If that checks out ok to good, you'll have to decide if you want to tramp it for a used engine or build up what you have.

Personally, I don't see any reason why you can't approach 1 hp per cubic inch without getting stupid. I've done more ported, OEM head/cam swap combos than I can remember. It's usually worth it, depending on what you really want.


Shawn
__________________
Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is online now   Reply With Quote
Unread 07-04-2013, 06:33 PM   #11
Blutarsky
Member
 
Blutarsky's Avatar
1979 CJ5 
 
Join Date: May 2013
Location: Lubbock, TX
Posts: 178
Quote:
Originally Posted by LeePrather View Post
I'm open to just about anything. I just bought this in march and it has a 304 that was original to this jeep. It's in great shape and was recently rebuilt. Buying a 360 would cost me 5 grand and a 401 8 grand. Since this is for playing, I'd be more interested in maximizing what I have. I haven't looked into anything yet, but I would like to get the most bang for my buck?
Bought a 360 for $300. You don't have to pay that much.
Blutarsky is offline   Reply With Quote
Unread 07-04-2013, 06:55 PM   #12
LeePrather
Registered User
1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 619
Quote:
Originally Posted by swatson454
Well let's evaluate your current engine. How's the hot, idle oil pressure? Have you run a compression check?

If that checks out ok to good, you'll have to decide if you want to tramp it for a used engine or build up what you have.

Personally, I don't see any reason why you can't approach 1 hp per cubic inch without getting stupid. I've done more ported, OEM head/cam swap combos than I can remember. It's usually worth it, depending on what you really want.

Shawn
Hot idle oil pressure ranges from 10-20 psi up to max 50 or 60 at high rpm. I would prefer to build what I have.
LeePrather is offline   Reply With Quote
Unread 07-04-2013, 06:56 PM   #13
LeePrather
Registered User
1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 619
Quote:
Originally Posted by Blutarsky

Bought a 360 for $300. You don't have to pay that much.
If I was gonna go up in size, I would probably like to go 401 just to make it worth it. Is the 360 really that much stronger than the 304?
LeePrather is offline   Reply With Quote
Unread 07-04-2013, 07:34 PM   #14
lucdog
Web Wheeler
 
lucdog's Avatar
1980 CJ5 
 
Join Date: Jul 2006
Location: , Il.
Posts: 8,044
Quote:
Originally Posted by John Strenk
yes and I think J-20 trucks...
J 4000 as well.
__________________
1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
lucdog is offline   Reply With Quote
Unread 07-04-2013, 08:19 PM   #15
big_o_tom
Registered User
1978 CJ7 
 
Join Date: Mar 2012
Location: Tazewell, Tn.
Posts: 343
I swapped out the 304 in mine for a 401, and yes there is a big difference. If you already have a 4 barrell carb and intake then get a good set of plug wires and some headers with glass packs.
big_o_tom is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.