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-   -   DYNOED 4.0 head on a 4.2 block (https://forums.off-road.com/jeep-short-wheelbase/87933-dynoed-4-0-head-4-2-block.html)

**DONOTDELETE** 09-21-2001 02:17 AM

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 .


Wrangler88 09-21-2001 03:13 AM

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
Got Jeep?

**DONOTDELETE** 09-21-2001 03:23 AM

Re: DYNOED 4.0 head on a 4.2 block
 
4900 RPM for the HP and 3200 for the torque .



wades_76_CJ7 09-21-2001 03:32 AM

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!!

lumpy85 09-21-2001 04:45 AM

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...

**DONOTDELETE** 09-21-2001 04:29 PM

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

Do you smell that?[img]/wwwthreads_images/icons/tongue.gif[/img]

**DONOTDELETE** 09-21-2001 04:48 PM

Re: DYNOED 4.0 head on a 4.2 block
 
What did the torque curve look like from idle up to 1200?


YJ4LIFE 09-21-2001 05:15 PM

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...

http://members.tripod.com/GRK_Taz

**DONOTDELETE** 09-21-2001 10:27 PM

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
ORC Land Use Editor
Land Use
VP RockGarden 4 Wheelers, Aztec, NM
RockGarden 4 Wheelers

Smokngun 09-21-2001 10:32 PM

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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