Abdullah

iTrader: (2)

what is the stock valves sizes of each head above?

how do i know that the head i'm buying from the junkyard is a 5.3 LS head?

does it have certain casting number that i can identify the 5.3 head with it?

thanks for the info.

Abdullah

iTrader: (2)

any one?

Gunnar@Patriot

iTrader: (20)

The 5.3 heads come with 1.89"/1.55" valves and the 5.7 heads come with 2.00"/1.55" valves. The 5.3 heads will have a casting number of 862 or 706. The 5.7 heads can have 806 (97-98 perimeter bolt), 241 or 853 (99-up LS1 heads), and 243 (LS6/LS2 heads).

Abdullah

iTrader: (2)

thanks Gunnar. i have another question :

what is the chamber size of the 5.3 LS head?

thanks.

Thrasher245

iTrader: (5)

Not tryin to take over your post, but im not 100% educated on heads...Why would one want 5.3 heads?

Gunnar@Patriot

iTrader: (20)

The factory chamber on a 5.3 head is approx. 61cc.

Some guys will use 5.3 heads to up their compression. The heads flow like a LS1, but have the smaller chamber.

Abdullah

iTrader: (2)

thanks Gunnar.

if i want to up the valve size from 1.89" to 2.00" in the LS 5.3 head do i need to unshroud the new 2.00" valve?

PREDATOR-Z

I tell you what Abdul,
Send those puppies to Gunnar and he will do magic on them for you.

Gunnar@Patriot

iTrader: (20)

You can improve the flow by increasing the valve size and doing some work to the bowl area along with a good valve job. If you would like, we will be glad to price doing our CNC porting to your set of heads.

Abdullah

iTrader: (2)

thanks again Gunnar.

halla PREDATOR-Z (smile), you know i have to ask questions to get some answers.

last question (smile) : what compression with 0.015" milled 5.3 head and stock GM head gasket in a stock 346 short block?

will i be safe from the valves hitting the pistons with the 0.015" milled 5.3 head, stock GM head gasket and the TSP 233/239 cam in a stock 346 LS1 short block?

thanks.

PREDATOR-Z

~ 11.49:1

Abdullah

iTrader: (2)

great. mashkoor PREDATOR-Z.

how about the P to V clearance?

PREDATOR-Z

With what cam?

prostock_bigblock

iTrader: (11)

ya ma3wad ,you will definetly need to flycut pistons with the 0.015 mill on the 5.3 .

good luck.

Abdullah

iTrader: (2)

PREDATOR-Z, the cam is the TSP XS Series Camshaft:

233/239 .595"/.603" Camshaft 112 Lobe Seperation.

Abdullah

iTrader: (2)

prostock_bigblock, are you studying in the US?

i will use the TSP 233/239 cam, will i have P to V in a 0.015" milled 5.3 head with 2.00"/1.55" valves and stock GM head gasket?