New to building motors, but wanna try

[xtremzj]

hello. n00b here. I currently have a modded 4.6 Golen stroker motor i bought and had them do some extra mods to it while it was there (port polish, blue print, bored out) And i love it! I spent a pretty penny buying it and now wanna try my hand of building one for myself (only way to learn right). Im a mechanic so i have basic knowlede and whatknot.

What i wanna do is build a 4.8-4.9 (i just want more power!) I thought about just supercharger the 4.6 but really just want to build it and put it in and keep the 4.6 as a spare.

Sooooooo where do i start, whats all the best stuff i can buy? Whats the average price are people paying to build these?

Be easy on me! :flame suit on:

here is a pic of the jeep

[mikey_d_13]

i just finished a 4.5 and its alot of fun building, especially if you dont need it right now..

as for the best parts and what you need..start with your formula and get a 4.0 block, get all the machine work and evrythin, and a 258 crank and maybe rods depending on ur plans

[xtremzj]

Bump.
So I have the block, 4.2 crank and rods, stock head and cam.

What's the next step? Just bring everything to a machine shop? I know I need pistons (not sure which ones yet) but what else do I need?

I've done lots of reading and get mixed answers.

[Cheromaniac]

So I have the block, 4.2 crank and rods, stock head and cam.

What's the next step? Just bring everything to a machine shop? I know I need pistons (not sure which ones yet) but what else do I need?

You said that you wanted a 4.8-4.9L displacement in your first post but that's only possible with a custom billet crank ground with a stroke of 3.98" or higher. You could, however, have the rod journals of your existing crank offset-ground 0.040" undersize to increase the stroke by 0.020" to 3.915". With +0.060" pistons you'd have a displacement of 4681cc and you could copy this recipe:

4.7L medium-buck stroker

Jeep 4.2L crank offset-ground to 3.915" stroke
Jeep 4.0L 6.125" rods
Keith-Black UEM-IC944-060 pistons
10.0:1 CR
CompCams 68-235-4 210/218 degree camshaft
CNC ported HO 1.91"/1.50" cylinder head
Mill block deck 0.018"
Mopar/Victor 0.043" head gasket
0.043" quench height
Flometrics F&B 68mm billet TB
Accel 26lb/hr injectors for '96-'04 engines
281hp @ 5000rpm, 337lbft @ 3700rpm

You'll need to buy the pistons first (with rings) and take them to the machine shop before they can rebore the cylinders. Naturally you'll also need a shopping list of other parts including main/rod/cam bearings, freeze plugs, oil pump, timing set, upper/lower gasket sets, cam/lifter kit, valve springs/retainers/keepers, roller rockers, oversize injectors, high-flow water pump, thicker radiator, and an auxiliary tranny cooler.

[EVIL95XJ]

you`ll be fine, i just built my stroker over the summer, first ever motor build, just got it dialed in recently and runs great, good luck