Stretching the V12

[AussieV12]

Now that it's looking a bit more possible for the V12 conversion, I've decided that 5.3 litres just isn't big enough. So for a few more questions:

What is the stroke of a stock 5.3 litre V12?
What is the size of the rod journel on the crank?
How long are the rods?
One website claimed they can be bored to 98 MM, true or false?
If true, could they be bored/sleeved to 4.000" ( Chev 350 size ) ?

 

[linmalki]

Stroke is 2.7559"
Rod journal is 2,2994-2.300"
stock bore is 3.543; one major piston manufacturer (AE/Hepolite) does not supply pistons in oversize; one is expected to replace sleeves rather than overbore. The outside diameter of the stock sleeve is 3.8585, so the sleeve can't be bored much if at all.
Sorry, couldn't find rod length.
The latest version (94-97) of the V12 is 6.0 litres, but it is also 3.543" so obviously it was stroked rather than bored. Don't have many specs on this engine, sorry.

 

[AussieV12]

The V12 has replaceable sleeves? Didn't know that. Anyway, some information is better than none. Hopefully another member can provide answers to the other questions.

A new question would have to be, what is the stroke of the 6.0 litre V12? And does it have the same rod journel dimensions?

 

[Michael J.]

The 6.0 liter was indeed stroked

Go to www.vintagejag.com I recollect seeing an article on Walt Osborn's website about a seven liter v-12. modified from the stock 6.0 liter version.

 

[AussieV12]

Re:

Thanks for the link, but I couldn't find any info on what bore or stroke he used, or how he achieved it. I'm sure something will be posted sooner or later.

 

[Michael J.]

Re:

Consider sending Walt an email possing those questions