It's all custom fabrication if you want performance manifolds for k10's. There is virtually no demmand for those kinda parts which is why no mainstream tuning companies bothered to start producing them. Best thing to do, if you are serious and you are prepaired to spend some money, get a spare inlet mani and a spare exhaust mani, then take em to a propper fabricator and ask em to make performance versions.
Many people forget that the stock inlets have coolant pumped through them to keep the carb at the right temp. So they don't incorporate channels in their "performance" manifold to carry the coolant, which means they can't use it.
A port polish won't turn your engine into a fire breathing rocket, it just makes it a little easier for it operate. A slight improvement in throttle response is what will be gained. This is part of NA (naturally aspirated) tuning which i mentioned above somewhere, and as i said, the costs involved outweigh the benefits. Performance manifolds are probably the single most effective way to tune an MA engine, or as i said, conversion to a fuel injected setup.
One thing i'll say about tuning, whichever tuning route you wanna take. Give yourself the budget to see it through all the way. I've lost count of the number of times people have asked "how can i tune my MA to get more power" and then further along they write something like "i'm on a shoe-string budget".
It always bugs me a little because you can't do it on a nothing budget, if you want power then you've gotta be prepaired to spend the money to do it right or else you're just gonna run into problems and waste money.
If anyone out there is serious about tuning, the best advise i can give you is to research into it and workout what costs are gonna be involved before you even spend a penny. Get a plan together, research local companies who can do the fabrication you need, or who sell the parts/products you need. Get at the very least a rough total price figure and then make sure you have enough cash saved up and put aside for it before you start putting things into action.
(Y)
