Stroker motor ? for DYNO

I just tore down my doner motors(the 4.0 was pristine inside)and was wondering about the 258 crank. The motor is of unknown age(I think it is very old though),has the long balencer snout and large counter weights. What do you think of this crank for my stroker? I'm doing the low cost stroker 4.0 piston 258 rods. Will there be any block clearence problems with the counter weights? Thanx, Jeremy

Also, will there be any CR problems with stock 4.0 pistons and FelPro headgasket(stock deck height and unmachined head?

It sounds like you have the '72-'80 heavy crank with 12 counterweights and a 2.48" snout. Those are reputedly the strongest of the 258 cranks. Read the casting no. on the crank. It should be 3214723. If it reads 3235477, it's an '81-'86 4 counterweight light crank. There are no clearance problems with the stroker crank. Since it's an old crank, ask the engine shop to check all the rod and main journal dimensions to ensure they're all consistent and that there's no undue wear. Otherwise the journals will need to be reground and undersize bearings used.
CR on a simple 4.5L stroker with no milling of the block or head will be around 9.7:1. That's not a problem provided you install a longer duration camshaft than stock to bleed off cylinder pressure at low rpm and prevent pinging problems. The most suitable cams are the Crane 753905, CompCams 68-231-4, and the CompCams 68-235-4. You'll need to feed the beast with premium fuel and install oversize injectors (Ford 24lb'ers are the most popular) to make sure that the engine doesn't run too lean (and cause more pinging problems).
_________________________________________________________________
- 1992 4.0 XJ Laredo UpCountry with modifications - 172k miles - AX15, NP231, D35c, D30
Estimated 240hp@5250rpm/280lbft@3500-4000rpm, 1/[email protected], race weight 3465lb
- Future mods -
Magnaflow 2.5" exhaust by Kolak, 4.6L stroker
- Websites -
Jeep 4.0 performance, 4.6L stroker build-up
- Tech Webpages -
CTS resistor trick, Dual electric fans, IAT sensor relocation, Intake manifold heatshield, MAP adjuster, Oil temp. gauge install
- Info Pages -
Automotive formulae, Jeep 4.0 cam specs, Jeep engine dyno graphs

Whats the best source for the Ford 24lb injecters. Prices,ect.

Try e-bay. You'll find them there very cheaply.

What specific Ford applications use those injectors(I can probobly source them locally).

Early/mid 90's Mustang 5.0 Cobras came with 24lb injectors as standard.

taurus SHO 6 cylinder also uses 24lbs injectors

edit: good to see you over here to dyno!

came looking for unibody reinforcment info, but it's nice to see familiar faces

Junior said:

edit: good to see you over here to dyno!

came looking for unibody reinforcment info, but it's nice to see familiar faces

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