DYNOED 4.0 head on a 4.2 block - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-21-2001, 03:17 AM
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DYNOED 4.0 head on a 4.2 block

I have a Clifford 4.0 head and a 4.2 block . Short block has forged pistons , molly rings , Comp Cams Extreme Energy [email protected] & [email protected] with .493 and .513 lift . I also have the Offenhauser aluminum intake 4BBL manifold with a 600 CFM Holley vacuum carb . Compression is at 10.2-1 ( pump gas ) . Headman headers and Flowmaster Racing 1 chamber 3 inch muffler . I have dynoed this combo in California on a dynojet dyno . This is rear wheel horsepower and torque figures , 289 HP and 301 LB FT of torque .

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post #2 of (permalink) Old 09-21-2001, 04:13 AM
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Re: DYNOED 4.0 head on a 4.2 block

WOW this motor!!
what was the highest RPM's that you hit to get that 289hp and at what RPM's did you hit your max torque?
thanks

(\/)ikey
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post #3 of (permalink) Old 09-21-2001, 04:23 AM
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Re: DYNOED 4.0 head on a 4.2 block

4900 RPM for the HP and 3200 for the torque .


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post #4 of (permalink) Old 09-21-2001, 04:32 AM
 
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Re: DYNOED 4.0 head on a 4.2 block

Just out of curiousity, how much coin did it cost? Did you do the work yourself or have a shop build it?

Fill out your profile. thanks, Wade

76 CJ7, 258,Jeep T18, D20 TC, D30 & AMC20.
4" Superlift, 33" SSR's
Will trade extra kidney for Jeep parts!!
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post #5 of (permalink) Old 09-21-2001, 05:45 AM
 
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Re: DYNOED 4.0 head on a 4.2 block

SWEET!!! What kind of gas milage do you get out of that setup? What kind of pistons did you get and where did you get them?

85 cj7 4inches, 33's, working on an engine swap...
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post #6 of (permalink) Old 09-21-2001, 05:29 PM
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Re: DYNOED 4.0 head on a 4.2 block

Have you had it wheelin yet? The motor I bought is similar to yours and the guy suggested a 600 Holley. I thought it might load up on the trail so I went with Cliffords suggestion and used a 390 Holley. It runs great but I'm sure it isn't in your league. What type of ignition are you running?


Edder

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post #7 of (permalink) Old 09-21-2001, 05:48 PM
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Re: DYNOED 4.0 head on a 4.2 block

What did the torque curve look like from idle up to 1200?

post #8 of (permalink) Old 09-21-2001, 06:15 PM
 
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Re: DYNOED 4.0 head on a 4.2 block

Wholey crap!!!!!! thats stock LS1 v8 territory!!!!

-Tas
'89 YJ Wrangler, 4.2L, AX-15, 31x10.5" BFG AT KOs, no lift, 40series Flowmaster, Euro-taillights...

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post #9 of (permalink) Old 09-21-2001, 11:27 PM
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Re: DYNOED 4.0 head on a 4.2 block

Impressive numbers, but sounds more like a mud bog or desert race motor than a crawler, too much carb, IMO. But, would sure surprise a Mustang or Camaro owner or two on the street.

Brad
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VP RockGarden 4 Wheelers, Aztec, NM
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post #10 of (permalink) Old 09-21-2001, 11:32 PM
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Re: DYNOED 4.0 head on a 4.2 block

Dang, cool six! What a cam in that thing, how does it behave driving it around, or is it a trail only rig?

Mike H.
1983 CJ-7 Laredo, IT'S ALIVE!
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