how much hp would i gain if i were to port and polish my stock heads i have a 98 t/a

 

wow.....that's like asking how much gas mileage will you get....and you haven't even bought the car yet!

Not trying to be a smart ***, but porting heads (and the measurable results) involves so many variables from type/extent of porting job, to who is porting, to how is it measured for quality and consistency across all ports, etc, etc,. And that's not including the bigger variables outside of the heads: type/size of intake, cam, and exhaust. I see you are running headers, so that answers one of the variables.

Perhaps if you gave people with the expertise (experience) additional concrete information, such as:

1. Who is doing the porting? You or a professional porter?
2. How much porting is being done?
a. Bowl blending?
b. Short radius?
c. Intake/exhaust runners?
d. Combustion chambers?
e. Gasket/port matching?
f. all of the above
3. Are you going to use the stock cam?

This is the short list.....

If you have done any in-depth research and/or searching through prior threads, you can see there are various "stages" of porting, and that those who have a "stage" that you are shooting for will give some consistent results that you can have as your goal.

 

you might want to see how cheap you can get a set of used 241 heads and have them ported

 

I got just what you need. https://ls1tech.com/forums/lsx-parts-sale/644861-fs-241-heads-valves-springs-40000-miles.html

 

why cant i just port my stock heads instead of buying some used ones i know a place where they could port a polish them for 300$.

 

I think the later heads have better flow to start with than the 98's. Better casting.

Bill

 

You can do that. But are they doing a valve job as well? Will they include the valve springs, seats and seal for that price? Weigh out the entire cost before you decide wich is cheaper. USed heads can be a real good deal some times depending on who's they are. Dont buy 241's to do it yourself, either. Your just wasting your time and money at that point. Buy used ported 5.3 or ls6 heads that are TSP or TEA or PP. Best bang for the buck under total investment of $700.

 

I agree. I am looking for a set of ported ones myself.

Bill

 

when u say 5.3 heads do u mean off a 5.3 chevy v8 or what???

 

yes. 5.3 litre heads find a used set from PRC or TEA

 

We can CNC your stock heads on our 5 axis CNC machine, or if you are looking to get a set of CNC'd LS6 Stage 1 heads I can also work out a good price for you on those. Feel free to PM or email me with any questions.

Thank you,

Chad @ Livernois Motorsports
313-561-5500 EXT 2155

 

ok i know what i need now but how much power will i gain if i were to port and polish some 5.3 heads

 

20-40+ depending on complete setup would a safe guess

 

i have a set of ported and poished 5.3 heads (hand ported) if any one is interested $450 shipped p.m. me or email at craze4speed@yahoo.com