My new project

[GrimmJeeper]

drivetrain is out time to start degreasing everything. it's a real mess in here this thing looks like it had a massive oil leak for a looong time, it's all over the engine bay and the underbody.

 

[GrimmJeeper]

 

[tone]

That sum bitch has seen cleaner days! Spray some berttle doo on it and it should clean up nice.

 

[chasdb]

How dose the crank and rods look on the 258 block? Hope they are in good shape.

 

[GrimmJeeper]

They were in great shape, and waiting to go in, I just need to come up with enough money to start the build lol.

 

[casual]

Go long rob. Rod angle will be better and power will be come on earlier.
Longer rods and bigger bores for power down low, short rods & smaller bores for power up top. We only rev to 5500rpm so might as well take the advantage.

 

[GrimmJeeper]

the guy building my engine builds 1000+ hp top fuel dragster engines for a living and some of the best stroked 4.0s around on the side. I explained that this is going to be a street machine and he's going to take care of the rest.

I think he knows what he's doing

 

[casual]

And he chose short vs long? Hmm, everyone all throws me the long over short, especially on jeepstrokers. But hey he sounds like he knows what he's doing. I just want to see a finished product.

 

[GrimmJeeper]

short what? are you talking about the rods? if money was no object I'd have forged and shotpeened eagle rods in there, but I'm building this on a severe budget. the cam is the only thing I'm dropping big coin on because it will make the biggest difference in performance.

 

[casual]

i just went back to see what all you already had..
I was under the impression you still needed rods & a crank lol. If I were to start one and didn't have short (4.2L) rods already, I would just use the long (4.0) rods & off the self KB pistons. Should come out around the same after you buy the 4.2l and get them reconditioned & also buy the new pistons..if you go that route that is.

Are you doing a 4.6L? What cam did you decide on?

 

[GrimmJeeper]

it's a custom ground comp cam, yes doing a 4.6 with some mild port work. i'll post up more about it once the motor is built.

 

[casual]

Oooow this could get exciting! Dyno this thing with stock lift & tires just to see what it'll do.

I need a spare renix head to port and get some slightly bigger valves for.

 

[GrimmJeeper]

go with a 7120 casting head (early HO) especially if you're going to port it. they flow better and the only difference on the intake/exhaust manifold side is the port sizes (a little smaller on the renix i believe).

 

[casual]

Ya different shape and a little smaller. Whats all required to use a HO head in a renix?

 

[GrimmJeeper]

Nothing other than what I mentioned.