www.v8 forum.co.uk . Blowers, Webers, headers, tuning, and all that stuff. Also D & D Fabricators, I love their 4 Weber side draft manifold.
I have to agree with this one. Headers alone will not provide a significant power increase. It may be noticeable, but far from what one might expect for the money spent. You need to keep in mind that exhaust is only one part of the equation. To maximize the results, you need to increase fuel, air intake, and spark as well. Headers often provide a better flow path but without any additional power adders it is hard to benefit from this mod alone. If your OEM manifolds are in good condition, you may want to consider a better muffler and a K&N style filter.p76rangie said:Headers will not give it any noticeable power increase and you are basically wasting money. There is no a lot you can do to them except make sure they are tuned and maintained correctly. If you want a bit more power just change over the block to a 4.6.
LOL....wait a sec....changing over to the 4.6 is no cheap task. Its definitely a couple steps above some cheap ebay headers though.p76rangie said:Headers will not give it any noticeable power increase and you are basically wasting money. There is no a lot you can do to them except make sure they are tuned and maintained correctly. If you want a bit more power just change over the block to a 4.6.
About $2,000 US for a brand new 4.6 short motor from Land Rover shipped to my home. Headers provide virtually no power increase over the standard exhaust manifold. So yes it is a little more expensive but it will give you a noticeable power increase.crypticbcd said:LOL....wait a sec....changing over to the 4.6 is no cheap task. Its definitely a couple steps above some cheap ebay headers though.p76rangie said:Headers will not give it any noticeable power increase and you are basically wasting money. There is no a lot you can do to them except make sure they are tuned and maintained correctly. If you want a bit more power just change over the block to a 4.6.![]()
In the UK these motors were used in many different cars over 30 years from MGs to Range Rovers. Therefore they are as common in the UK as Chev V8's are in the US. It is more this availability that makes them popular rather than them being a performance motor.leadfoot said:I have been reading that the all aluminum buick/rover motor is the premier hotrod motor in the UK, like the chevy smallblock is in the US. It seems you can do alot! I'm still researching myself but I know there are companies in the UK with extensive experience with head porting, cam grinds, and all facets of motor machining. There are companies that sell ECU remapping technology, and ones that sell filters and exhaust setups. The buick/rover motor was designed from the begining as a perfomance platform. Google buick 215 motor mods as well as rover motor hotrods like with the MGB conversion. These people seem to have reliable formulas with predictable returns. I think this motor was designed to rage but was tuned to be a reliable and civil truck motor in the RR.
3.9's also get slipped liner. One in a Disco I purchased had 3 slipped liners. Yes the 3.9 heads and virtually everything else can be used on a 4.6 block.CSK said:The 4.6L block sounds good, and I can use the 3.9L heads? I heard those 4.6L blocks get slipped liners etc, so I'm a bit sceptical about putting a 2nd hand block in?
p76rangie said:About $2,000 US for a brand new 4.6 short motor from Land Rover shipped to my home. Headers provide virtually no power increase over the standard exhaust manifold. So yes it is a little more expensive but it will give you a noticeable power increase.crypticbcd said:LOL....wait a sec....changing over to the 4.6 is no cheap task. Its definitely a couple steps above some cheap ebay headers though.p76rangie said:Headers will not give it any noticeable power increase and you are basically wasting money. There is no a lot you can do to them except make sure they are tuned and maintained correctly. If you want a bit more power just change over the block to a 4.6.![]()
Its about the same price to get top hate liners fitted to an old motor before the cost of new pistons, rings, bearings, etc. Nothing is cheap in Land Rovers, it is just that some options are cheaper than others.crypticbcd said:Yes, I definitely agree with your comment! But $2,000 is not pocket change to most people.![]()
They have specials from time to time. About a month ago they had 6 4.6 short motors for $2,300 each delivered.rufant said:Ian, do you have a link for the engine supply?