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258 Rebuild: RV Cam and high comp. head/pistons upgrades
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05-14-2008, 10:52 PM
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#1 | |
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Registered User
1982 CJ7
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258 Rebuild: RV Cam and high comp. head/pistons upgrades
Close to rebuilding the 258 and was thinking while it's being rebuilt, might as well go for a little more power, because these 258's don't have much to begin with.
How much extra power can you expect from an rv cam and higher compression head/pistons? I already have a Borla header and catback system and plan on getting the Howell CA kit as well. Is 30-40 hp a reasonable expectation?
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Terry ~ USN Ret. 30Sep07 : ) 1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's 33" Toyo M/T's on Pro Comp Xtreme Series 1069 Borla header and Catback Exhaust System Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper |
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05-15-2008, 05:42 AM
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#2 |
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Registered User
1979 CJ7
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Are you doing the 4.0 head swap????
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05-15-2008, 12:06 PM
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#3 |
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Registered User
1982 CJ7
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I had thought about it, but it might be easier to keep the 4.2 head. I already have a Borla header and don't want to buy another one to fit the 4.0. Not sure about the 4.2 intake working either. Trying to stay smog legal.
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Terry ~ USN Ret. 30Sep07 : ) 1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's 33" Toyo M/T's on Pro Comp Xtreme Series 1069 Borla header and Catback Exhaust System Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper |
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05-15-2008, 01:23 PM
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#4 |
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SERVANT TO THE JEEP GODS
 
1984 CJ7
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The only thing I would think about is only bumping the comp. up moderatley. With the price of gas, do you really want to have to run premium?
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'84 CJ-7: 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, Yukon 1 pc axles, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rear aussie locker, twin sticks/clocking ring waiting to go in. JEEP GIRL WANTED: ONLY THE TOPLESS AND DIRTY NEED APPLY. |
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05-15-2008, 02:39 PM
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#5 |
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Registered User
1982 CJ7
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No, I'd rather not buy premium, but since it's only been a weekend driver so far, it wouldn't be that bad, if I could get noticeable performance gains from it. I think stock comp. is 8:1 so I thought bumping it up to 9.5:1 might do some good.
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Terry ~ USN Ret. 30Sep07 : ) 1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's 33" Toyo M/T's on Pro Comp Xtreme Series 1069 Borla header and Catback Exhaust System Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper |
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05-15-2008, 02:44 PM
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#6 |
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Registered User
1980 CJ5
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You can make the 4.2 intake fit the 4.0 head. Trust me, if your going for power, do the head swap. It's like night and day.
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80 CJ5 in the process of a frame up resto 96% complete. The little stuff will kill me. On the back burner for college. |
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05-15-2008, 05:19 PM
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#7 |
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Registered User
1982 CJ7
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Will the Howell CA kit for the 4.2 work with the 4.0 head swap?
__________________
Terry ~ USN Ret. 30Sep07 : ) 1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's 33" Toyo M/T's on Pro Comp Xtreme Series 1069 Borla header and Catback Exhaust System Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper |
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05-15-2008, 08:51 PM
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#8 |
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Registered User
1980 CJ5
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Don't see why not. It doesn't do anything with the block or anything else.
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80 CJ5 in the process of a frame up resto 96% complete. The little stuff will kill me. On the back burner for college. |
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