MyJEEPforum.com



 
HomeHome  PortalPortal  CalendarCalendar  GalleryGallery  FAQFAQ  RegisterRegister  Log inLog in  

Share | 
 

 Need second opinion for future rebuild

View previous topic View next topic Go down 
AuthorMessage
J.McDonald Knives
Trail Ready
Trail Ready
avatar

Number of posts : 72
Age : 32
Location : Corpus Christi, TX
Rig : 1980 CJ7
specs. : 258ci, auto trans (for now), YJ tub, mostly stock
Registration date : 2012-06-19

PostSubject: Need second opinion for future rebuild   Tue 26 Jun 2012, 1:00 am

Ok all you performance gurus, looking for a second opinion on cam and lifter kits for best performance. This is for the AMC 258. Already going to go with the 4bbl intake but also need to figure out which carb to go with that. So here are my choices for the head rebuild. Looking for the most performance I can get while keeping it reliable.

http://www.summitracing.com/parts/CCA-K68-239-4/
http://www.summitracing.com/parts/CCA-K68-231-4/
http://www.summitracing.com/parts/CCA-K68-232-4/
http://www.summitracing.com/parts/CCA-K68-200-4/
http://www.summitracing.com/parts/CCA-K68-235-4/
http://www.summitracing.com/parts/CCA-K68-115-4/
http://www.summitracing.com/parts/CCA-K68-201-4/
Back to top Go down
View user profile http://www.jmcdonaldknives.com
J.McDonald Knives
Trail Ready
Trail Ready
avatar

Number of posts : 72
Age : 32
Location : Corpus Christi, TX
Rig : 1980 CJ7
specs. : 258ci, auto trans (for now), YJ tub, mostly stock
Registration date : 2012-06-19

PostSubject: Re: Need second opinion for future rebuild   Thu 28 Jun 2012, 9:44 pm

Going to be picking up a 1980 CJ7 tomorrow rather than the CJ5 but its still got he 258 and plan on doing the mods in about a month so I'm still needing guidance from the fellow technicians on here.
Back to top Go down
View user profile http://www.jmcdonaldknives.com
SBC_Tim aka thebigtman
Got No Life
Got No Life
avatar

Number of posts : 944
Age : 43
Location : La Vernia, TX
Rig : YJ/TJ, V8, tons
Registration date : 2009-09-04

PostSubject: Re: Need second opinion for future rebuild   Mon 09 Jul 2012, 8:43 pm

How about the 4.0 head, Howell F.I., and a Comp or Crower cam? I know those are popular for that setup. I'm not a 258 guy so I can't give you specifics on lift and duration but from being around them I know that setup is pretty stout.

Back to top Go down
View user profile
J.McDonald Knives
Trail Ready
Trail Ready
avatar

Number of posts : 72
Age : 32
Location : Corpus Christi, TX
Rig : 1980 CJ7
specs. : 258ci, auto trans (for now), YJ tub, mostly stock
Registration date : 2012-06-19

PostSubject: Re: Need second opinion for future rebuild   Mon 09 Jul 2012, 11:43 pm

I'm sticking with my 4.2 head and have already looked at the 4.0 head conversion and its just not what I'm looking for. Trying to keep it all 4.2 but with just a little more power.
Back to top Go down
View user profile http://www.jmcdonaldknives.com
paramedac
Poster child
Poster child
avatar

Number of posts : 221
Age : 51
Location : San Antonio
Rig : 1995 yj soft top half doors
specs. : 1.75 shackle lift 31x10.5x15 mud rovers,aftermarket bumpers but still the 2.5L
Registration date : 2010-03-23

PostSubject: Re: Need second opinion for future rebuild   Tue 10 Jul 2012, 4:31 pm

Take your 4.2 head over to Long's racing engines and have Jerry go through it he did a great job on my Dad's 4.0 head and awsome work on our SBC bowtie heads
Back to top Go down
View user profile
J.McDonald Knives
Trail Ready
Trail Ready
avatar

Number of posts : 72
Age : 32
Location : Corpus Christi, TX
Rig : 1980 CJ7
specs. : 258ci, auto trans (for now), YJ tub, mostly stock
Registration date : 2012-06-19

PostSubject: Re: Need second opinion for future rebuild   Tue 10 Jul 2012, 7:22 pm

paramedac wrote:
Take your 4.2 head over to Long's racing engines and have Jerry go through it he did a great job on my Dad's 4.0 head and awsome work on our SBC bowtie heads
What kind of money would I be looking at? Plus thats in SA, not here in Corpus, lol.
Back to top Go down
View user profile http://www.jmcdonaldknives.com
Batjeep09
Walks The Walk
Walks The Walk


Number of posts : 143
Age : 40
Location : San Antonio
Rig : 2009 2 Dr JK
specs. : Big tires, scratches, cb, winch, lights, bike rack, more scratches and Batman decals.
Registration date : 2011-02-22

PostSubject: Re: Need second opinion for future rebuild   Tue 10 Jul 2012, 8:25 pm

Quite honestly a 4.2 build would probably be more on the unique build. I would recommend taking the heads to machine shop that's local and have the heads opened up with some porting of the intake/exhaust valves and mill the heads a bit. That will increase flow through your heads while increasing compression. Than just buy the valves to fit. The machine shop worth it's weight will know your sizes and interchangeable parts and weights. If you want to kick it up a tad more, have them port match the new manifold at the same time.
Back to top Go down
View user profile
Batjeep09
Walks The Walk
Walks The Walk


Number of posts : 143
Age : 40
Location : San Antonio
Rig : 2009 2 Dr JK
specs. : Big tires, scratches, cb, winch, lights, bike rack, more scratches and Batman decals.
Registration date : 2011-02-22

PostSubject: Re: Need second opinion for future rebuild   Tue 10 Jul 2012, 8:38 pm

Going with your list, the second one. K68-231-4. It has a power band 800-5000. Realistically, you won't go over 5k on that motor, but to start building power at 800 rpm is great for crawling and gearing options. .462/.485 is actually a good lift. If you get the head work done at a machine shop like the above post, you already have new springs and what not. The idol won't be out of control, nor your gas mileage. It would be a moderate build. Not weak but not balls to the wall.
Back to top Go down
View user profile
Sponsored content




PostSubject: Re: Need second opinion for future rebuild   

Back to top Go down
 
Need second opinion for future rebuild
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
-
» Opinion Poll on the future of WWE
» K100 Rebuild
» caliper rebuild question
» Buggy rebuild thread....
» rzr front diff. rebuild

Permissions in this forum:You cannot reply to topics in this forum
MyJEEPforum.com :: JEEP TECH :: Modified Tech-
Jump to: