99slobird

iTrader: (1)

just a quick question. my car is a 99 a4 simple bolt ons. i have a 03 chevy z71 5.3l i hear alot of people going with 5.3l heads on ls1. will these heads help my car get down the track quicker or am i just being dumb. is the 5.3 coils hotter than ls1 what parts if any could i swap to make better numbers

orangeapeel

iTrader: (18)

Its the combustion chamber difference as to why people are using the 5.3's. I think it gets your CR up to 10.75:1 as well. If you put them on your car, what is going on your truck? The 853's? Get a cam and a stall. That will help you get anywhere in a hurry.

orangeapeel

iTrader: (18)

You are also limited to 2.02"/1.575" valves with the 5.3 heads for as big as you can go. I would personally choose the LS6 style for more power. They are more expensive, but its how fast do you want to spend right?

99slobird

iTrader: (1)

well i have a 2500 stall, lt, bbk ssi intake, p&p tb, p&p maf ends, built tranny, and 4.10s with a 100 wet shot and for now i want to do a cam install and then later buy some heads. i want a fairly large cam but i dont want nothing that is going to be real hard to tune. what do yall suggest on my cam with my setup

wytry

iTrader: (6)

Something like whats in my sig or smaller. The 228r from Texas Speed in very popular and I believe most anyone can tune it without problems. Makes great power everywhere too.

99slobird

iTrader: (1)

you get a pretty good lope with that cam dont ya. if i went with something similiar or that cam what hp numbers could i expect? and what kind of drop in et. also i dont know if this changes anything but im thinkin about pulling that tranny again and going with a 3500 stall. i put one in a buddies lt1 yesterday and i absolutly love it with his loudmouth

orangeapeel

iTrader: (18)

You love the stall with the loudmouth?

mark21742

Since you already have a 2,500 stall I'd jump up to a 3,600-4,000 stall. My Trickflow 238/242 .595/.595 112lsa sounds big but was very easy to tune in. If you want to save some money you can pull your stock heads and have them ported and milled, I ported and milled my 241s .040" to bump it up to 11:1 lots of power and still very streetable with this setup.

I don't know if your 5.7 heads will work on the smaller bore 5.3, you might run into valve to bore clearance problems... Not sure though