02BLKWS6MD

iTrader: (22)

I just recieved a set of 5.3 truck heads for doing some work on a friends car for payment. I was gonna put a set of PRC springs on the and have them ported and polished. I was wondering because I will be going with a custom 230/230 .612/.592 111+2 cam and was wondering if I would have to check piston to valve clearences since these arent 5.7 heads? I'm not gonna mill the heads at all I dont think, I figured they would help out a little bit with the cam. Any info would be appreciated.

SOMbitch

iTrader: (8)

You'll be fine. Look at cam in sig. I am unmilled running stock MLS gasket. Leaves me about 10.75-10.8-1 compression and DCR 7.4-1 I would like more compression but didn't want to flycut.

racer77ss

the intake valve is smaller on stock 5.3 head 1.89'' i think and will kill any power you get from the bump in compresion but the gometry is the same as ls1 head just smaller chamber.
IMO you shood put a 2'' intake valve in if want to get your eforts worth out of your porting

Shawn MacAnanny

iTrader: (12)

I keep hearing about putting the bigger 2" valve in but wouldnt that require maching of the valve seats? That doesnt seem like an at home job.

slt200mph

iTrader: (42)

Send them to TEA and have them do their stage 1.5 CNC port job on them and you will have a great set of heads...they will put in the larger valves (2.02) and you will have plenty of flow and they will work great with that cam...call them and ask to speak with Brian Tooley

02BLKWS6MD

iTrader: (22)

Yeah i was figuring on sending them somewhere like that or LME. I just didnt want to mill the heads and flycut the pistons.

ProjectDuStU

iTrader: (4)

+1 they can make some good power...

02BLKWS6MD

iTrader: (22)

Has anyone sen them a set? About how much do they charge?

chrs1313

iTrader: (24)

i would guess around 550-600...wanna see the results since we are going to have the same cam

02BLKWS6MD

iTrader: (22)

Yeah I got the recommendation for Predator-Z since I asked him about custom cams and like this one.

slt200mph

iTrader: (42)

I bought mine directly from them I did not send them a set...like I said call and ask to speak to Brian Tooley (the owner) and he will answer all of your questions..

NHRAFORMULA00

iTrader: (2)

Yes you better check the clearance with those heads,its gonna be closer than with the stock heads.We had to back that cam up on Chrs1313 motor because it had like .060 thou on the intake to valve.(too close). Retarded it 2 degree it had about .075 on the intake,which is still too close but I can live with it.

PREDATOR-Z

Unmilled with properly done 2.02 valves and stock gasket, it will fit.

Jason 98 TA

iTrader: (4)

Definately will need a bigger valve like the guys are saying. We offer the cnc porting, valvejob, decking & reassembly for $600. If your going to install the 5.3l heads you really need to let someone experienced port them. The chambers, valve sizes & runners all need work before dropping on the ls1.

The PRC cnc work should work really well for you & we could do a stage 1.5 to keep the price down. Here's a link to some data on them:

http://www.texas-speed.com/shop/item...id=84&catid=20