Which V8 into a Series 3

Cheers all,
have found an ad for a 3.9EFI for 175 quid and thought about leaving me 2.25 petrol as spare, just in case (or while I overhaul it).
Now, I know the 3.5 carb version goes "straight in", with an adaptor plate as I understand, but how about 3.9EFI? Are all V8 the same size or will I encounter problems with later V8s?
Specs are:
Series 3 1978
109", single circuit brakes
electric fan
\\ so should be no problem for a V8-conversion, but I really wouldn't like to move the rad or something drastic like that

Thanks,
Phil

I'm not into conversions but I know that the stage-one V8 had the rad moved forwards but that could have been because of the RR transmission it was equipped with. Both that model (& the 6 cyl 109) had larger brake drums & bear in mind that the V8 used was a detuned version with only 91 horses.

thanks norse.

So no idea whether the motor blocks are the same?
No one?

I have just replace my 3.5 with a 3.9 with no physical issues at all.

From what I can see they are the same.

Do not forget the basic rule - bigger engines are better - it's the law.

i second that

you will end up with exhaust clearance issues and bulkhead clearance issues when fitting a V8 to a series

youl have to fit a range rover bulkhead

G-man said:

you will end up with exhaust clearance issues and bulkhead clearance issues when fitting a V8 to a series

Click to expand...

yes, but that is why you end up modifying the bulkhead...

thanks for the answers, cheers

how about this one for a mega project lol

BIG BLOCK CHEVY ENGINE 8L SUIT HOTROD COBRA KITCAR on eBay (end time 29-Sep-10 12:09:26 BST)

The 3.5 and 3.9L are the same block so no probs there,the only thing that might cause you trouble is the waterpump,on the 3.9 it's got a viscous fan that sticks out loads,so on a series it hits the radiator! But all you do is fit one off a rover p6 3.5 V8(it's about 4inch shorter)so you can keep the rad where it belongs.Rimmer brothers were the cheapest I found. Hope this helps