ramairz28

iam looking to put 5.3 head on my ls1 and just wondering wat casting number heads i should go with

96capricemgr

iTrader: (1)

243 or 799 are most sought after

Sales1@Texas-speed

What kind of build are you looking to do, and are you planning on having the 5.3 cylinder heads worked over before you install them?

dr_whigham

iTrader: (49)

The casting numbers you're looking for (For a 5.3 head) are 852 or 706.

I'd spend a good hour on Google searching on "Castech heads". These are the ones to stay away from.

Good bulletin here http://ww2.justanswer.com/uploads/Bl...t_loss_5.3.pdf

Aaron can get you going in the right direction though if you so choose.

ramairz28

i wanted to bump the compression and i haerd putting 5.3 heads on can do that and i feel if i run the cam iam using it will make some nice power

dr_whigham

iTrader: (49)

The point I was trying to make in the previous post was- and if I'm wrong, by all means correct me, be careful what you buy if it isn't from a vendor. Guys will sell you "low mileage perfect heads" when they are in fact cracked or prone to cracking Castechs. The bulletin I posted clearly shows the casting marks to STAY AWAY from.

Like I said, if you want a hastle-free experience, with people that know their craft, as well as can point you in the right direction, Texas Speed is great, as is any of our other sponsors. After all, if there's an issue, you want someone to stand behind it.

You very well may find out that a 243 or 799 casting milled to your specs may yield more power.

ramairz28

thanks for the im put i will contact taxas speed and see wat we can do as far as heads thanks agian

96capricemgr

iTrader: (1)

Just to be clear dr_whigam and I just posted casting numbers from different years. The numbers he posted were earlier years and the numbers I posted are for just the last few years.

dr_whigham

iTrader: (49)

That's actually true. Some of the 243's and 799's actually came from 5.3 trucks. Hell, mine came from a 2010 Silverado.

When I saw you wanted added compression though, I figured you meant the regular 5.3 heads.

ramairz28

well ur right i wanted to bump the compression up and heard 5.3 heads would do the trick i no the 243 r ls6 heads and 799 r truck heads then there r 706s and so on...i no the 706s arent the great heads if i were to put the 243's on with decking would it bup the compression?