Single rail will last behind a stock 351, I've had two 351 in different vehicles and they lasted OK. Generally the first thing to go are the bearing, you'll hear them whine, the input shaft will wobble a fair bit.
If your spinning the wheels a lot and use the gearbox agressively it won't last as long.
The RPM at 100km/h for both a c4 and single rail would depend on your diff ratio and tire size. A 2.75 diff with 14' tires will do around 2300rpm at 100.
Manuals are more fun than auto's I'd go the manual single rail, then when you have more $$$$ buy a toploader, you should be able to get one for around $500-600.
Also don't use a twin plate clutch, use a single 11' clutch and pressure plate, there stronger.
You might have to change your diff and ratio to handle 351, whats the current setup?
Its currently the stock 2.92 single spinner diff.
If i keep the single rail to use with the V8 will i need a new clutch?
I would have thought that since my Dad's old EA with 2.77 ratio could spin them then a 5.8 with a 2.92 single spinner should have no problems. I would hate to put this engine in then not be able to perform whan my mates demand it. They are commodore drivers, i cop enough grief.
I was quoted $400 for the whole kit to convert, it did include the hydraulic clutch set up but not sure if a new clutch was included. This was from a wrecker on canterbury road.
Will I need to change my pedal box?
I might go the C4 for now and save up and get myself a nice 5 speed supra box or something like that. My mate has one in his torana and its very nice. As long as it can go okay and put on a show i dont mind if its auto. I dont plan on doing anything drastic to this engine for a while either.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.