300cid?

[theslacker]

I've been told you can build a 4.0L block to a 300cid (4.9L). Is this acually possible without major cylinder bore work?

 

[old_man]

4.7 is kind of the range of no big issues. going to 4.9 or 5.0 entails boring the cylinders to the limit and a bit beyond. A good machine shop could sleeve the block for you and get around that problem, but is it worth the hassles? 4.7L is about .060 over.

 

[Gil BullyKatz]

I've been told you can build a 4.0L block to a 300cid (4.9L). Is this acually possible without major cylinder bore work?

Magnafluxing, sonic testing, sleeving... all possible and not at a cheap price...
Question is why?

More power? go 4.7 and throw a blower on it and forget about it

 

[5-90]

Possible - yes. Easy - no. You need to bore from 3.875" to 4.000" (+.125") and install a crankshaft that has been offset ground to 4.000" (a 4.060" is available) - which will also require clearance work on the oil pan rails.

However, going to the 4.5/4.6 or so stroker is easily done with a regular bore (or close to it) and the 258 crankshaft...)

5-90

 

[ZmOz]

Definately not worth the cost for an extra .2 liters...