Just bought a 1987 90 V8 which is in great nick but wanted to breath some more life into the engine and it needs a new exhaust which gave me the opportunity to make it sound better and go better! I am in surrey and wondered if anyone new who to speak too and perhaps what to do..... Budget is around 3k......
I'm probably going to disagree with most people on here.
But if you have a £3k budget. Do nothing to the engine in it.
The stock factory V8's performed well in their era and when compared to a 2.25p or 2.5TD, but they are somewhat underpowered today.
The are only 3.5 litres, low CR, very mild cam and make poor HP, even for a Rover V8.
It simply isn't worth spending money on it.
You'd be much better off pulling the engine and chucking it in a corner. That way, if you ever want to refit it for originality, if the value would demand it. Then you have it.
And go and buy either a 3.9/4.0 or a 4.6 and stick that in it. Either convert to EFI or chuck a 4 barrel carb on it.
RV8's are a good way to 200-250hp. But you can sink thousands into one and get hardly anymore.
If you want, chuck a mildish cam in what ever V8 you find, and slap a good exhaust system on it. And call it good. At this point you are at the point of diminishing returns.
Rover V8 heads are pretty rubbish, but tbh it'll cost you best part of £1000 to really improve them. And unless you are going big cam and chasing HP you'll probably not really notice it that much.
A cammed 4.6 with a good exhaust and non restrictive intake/induction should make a real world 230-240hp or maybe a tad more. And importantly it'll make much more torque low down, so will feel more powerful than it is.
A screaming 3.5 can also get to 220-230hp fairly easily. But it'll never make the low end torque and will feel slower.
Get some proper sports exhaust manifolds and get someone to custom build you an exhaust.