emnuke

iTrader: (2)

im looking at getting the PRC stage 2.5 5.3l heads.. im kinda new to F-bodies.. my car is already cammed with bolt ons and now i want heads.. will i have to do any extensive mods to intall these heads or will they just be bolt ons?

Studytime

iTrader: (15)

They'll bolt right on your motor. Just take a few accessories off, the intake, headers, etc. and they bolt right on.

You might want to have your tune touched up after the install, but if everything was done properly for your cam swap, the head install shouldn't comprise too much new work.

Ben T.

Studytime

iTrader: (15)

Also, there are a few articles out there you could read on swapping heads/cams in LS1 cars.

Ben

emnuke

iTrader: (2)

alright.. thanks.. but i wont have to "notch" the pistons or anything to compensate for the larger valves?

Studytime

iTrader: (15)

That depends on MANY factors that we could help you with, but fwiw, most do not have to "flycut" pistons.

Ben T.

BOWTIE

What cam do you have?

Tmoney

go with the 2.02" intake valve and you will have no issues. i have the ms3 cam with those heads and have no issues.

emnuke

iTrader: (2)

im not sure.. i bought the car already cammed and he didnt know the specs on it.. all i know is its lunati.. and as for the valves, well i already bought the heads from a guy on here and they have 2.04 intake valves in them.. if i have to ill take the cam out to see the number on it to figure out the specs but i really dont want to do that if i dont have to.

emnuke

iTrader: (2)

anyone?

DaveX

You need to make sure the valve springs will be a match for your cam. And you also might need to check p to v clearance depending on your cam. Without knowing what cam is in it, it's hard to know exactly what you need to do.

I think you could pull a valve cover, and check lift with a dial indicator on top of a rocker directly over an intake and exhaust valve to see exactly what your dealing with. If lift is under .600, p to v clearance isn't an issue and you can run comp 918 springs or better and be fine.

marv

iTrader: (40)

I just bolted a set of these to my car this past week. 2.5 5.3Ls from TSP with 2.04/1.575 valves, dual springs and comp valve job.

So far so good. P to V with my 233/239 was fine. Tune still needs tweaking and I still have to put it on the roller, but it's done real well so far.

Concerning install, they'll bolt right up without modification to anything else.

Good luck!

emnuke

iTrader: (2)

sorry man im nooob.. why would i need to figure out if the valve springs match up?

DaveX

Your valve springs need to be able to handle the lift of the cam, so you need to know what the lift is. Or you can play it safe and just buy double springs good to .650" lift, but you would be spending alot more money than you needed to if it was actually under .600".

PREDATOR-Z

Actualy it is not as much about lift but about seat pressures. What one should do is match the spring seat pressures to that of the cam's, then you're good to go.

DrChuck23

So right now you're running the cam with stock heads? If that's the case it is probably mild without much increased valve lift so likely springs won't be much of an issue, and these heads should be fine.