Custom Internals
As those who've been following the very slow progress of my engine build ('Land Speed LS') know, I've done a somewhat different progression. After doing the necessary 'book study', I went to Moldex Tool for my crank. The stroke has stayed at the factory 86 MM of the 4 litre Jaguar. By using the commonly-utilized 1.88 crank throw of the Indy Olds/Chevrolet/Honda Pro Stock, I've availed myself of readily-found HP bearings and almost-production-dimension rods. Working with the guys at Ross, we've built a set of pistons that have the nominal 86 MM diameter of the aforementioned 4 liter Jag (or, for that matter, the LS 3.9). They also utilize the .927 wrist pin of the SBC for extra strength and because there's a plethora of HP items available in this size. The pin is at the factory 4 litre location in the piston. There's still room to locate a ring package without interfering with the pin. I have both the pistons and the crank 'in hand'.
The rods (aluminium) are being made to the size necessary to fit the pin on the small end and the 1.88 race bearing on the other and to be of a length to properly fill the space between so that the pistons are 'zero-decked'.
The rods are close enough to SBC size as to cause no problems for the manufacturer. Even at that, they are taking a LOOOONG time to be finished. But that's what you must expect when going for full-custom pieces.
KS