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Unread 04-16-2006, 08:31 PM   #1
19jeep78
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1978 CJ5 
 
Join Date: Feb 2006
Location: College Station/Graham, Texas
Posts: 58
hoppin up the 258

hey guys im in the process of tryin to get some more power out of my 258. heres what ive done (or ordered) so far.

hedman header
offy dual plane intake manifold
390 holley
comp cam/lifters/timing chain (800-5000 powerband)
new msd coil/accel dist. cap/dual core plug wires

im also going to recondition the head. i think im gonna skip out on the porting (unnecessary on a motor built for torque?), and just do a 3angle valve job and new seals.
what else should i do on the head?
am i on the right track?

thanks for the help guys! i love this forum!
jake

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1978 CJ5
SOA, 1"BL,stock springs, 35x14.5" boggers, BUILT 258/T-18/D20 twinsticked/D30/AMC20
1977 Scout II. 345v8/727/d20/44s. stock...for now
The tow rig:
99 Dodge 2500 cummins on 37s
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Unread 04-16-2006, 08:49 PM   #2
cands
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Join Date: Jul 2004
Location: Canastota, NY
Posts: 302
so far so good, but if you have the extra cash, I would have the exaust ports and intake ports match ported. Keep the intake side rough ported and polish the exaust ports.
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Unread 04-16-2006, 09:10 PM   #3
Bgeddes
Ridin' with the King
 
Join Date: May 2005
Location: NEPA
Posts: 1,179
Adding a 4.0L Head would be a good move. While actual numbers seem to vary, the gains are no doubt of significance.
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Unread 04-16-2006, 09:40 PM   #4
19jeep78
Registered User
1978 CJ5 
 
Join Date: Feb 2006
Location: College Station/Graham, Texas
Posts: 58
thanks for the replies guys.

i really seriously considered the 4.0 head swap, but i heard that the only real hp numbers comes simply from the raise in compression it exhibits. that and i already have the header in the garage and im too lazy to send it back

as far as porting goes, i dont really have the cash for it. im sure it helps, but im watching the "cost vs hp" ratio. i dont wanna spend over $200(approx) on the head. can i spend money elsewhere that would benefit? like stiffer valve springs or roller rockers or something? just throwing some things out there..

thanks again,
jake
__________________
1978 CJ5
SOA, 1"BL,stock springs, 35x14.5" boggers, BUILT 258/T-18/D20 twinsticked/D30/AMC20
1977 Scout II. 345v8/727/d20/44s. stock...for now
The tow rig:
99 Dodge 2500 cummins on 37s
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