I have a 95, with a 5 speed 0 fuel plate all the way forwards and star wheel turned. 4 inch dp to 5 inch into 8 inch stack. Cold air intake. And a home ported intake elbow. How much difference will a four k spring and 60lbs valve spring make on my truck

 

about 1500 rpm diff

seriously myself I think 4k is too much but about 3200 is just right

so basically to answer yer question what you will have is a broder power range.................1800-4k

 

The 4ks really wake it up. even if you dont want all that rpm,it fuels all the way through the power band instead of falling off at 2200

 

night and day diff

 

So in other words it'll be pretty bad for what I have done so far. And it'll have better power forwards top end. Will it make it idle different. And would u recommend a aftermarket harmonic balancer. If so which one

 

 

Do the 4kgs and bump your timing up a couple degrees and your truck will haul

 

I have 3k's and have driven several trucks with 4k's and it is most def. a night and day difference. As 1AMatt said a little timing bump would be in order as well.