Why use 5.3 heads?
#5
Originally Posted by Mack'sZ28
Isn't cheaper to get the 5.7 heads milled?
#7
SN95 Director
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Originally Posted by mike m
plus 5.3 heads out flow the 5.7 heads.
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#9
TECH Fanatic
stage 2 heads at PATRIOT are only $1,295.00 And thats a complete CNC port job, there double gold springs, 2.02/1.57 valves, titainium retainers, and new viton seals!
#11
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I've got a spare set I'll trade someone. Stock for stock. I wanna lower my compression, so the ls1 heads would work out good for me.
FYI, it moves the 5.3 from 9.5:1 to ~9.1:1
FYI, it moves the 5.3 from 9.5:1 to ~9.1:1
#12
Banned
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A few headporters I have talked to say the 5.3's flow a tiny bit better after they finish them. The difference is very little (1-2cfm's from what I gather) Also a stock LS1 is 10:1 CR by adding the 5.3's you will have around 10.8:1 CR. Also you can add a bigger cam because you dont have to mill the heads for the added Compression.
If lower compression is what you want you need to try and trade the 5.3's for the 6.0 truck heads. The 6.0 heads will take a stcok LS1 from 10:1 down to 9.4ish:1 CR. Works greak for the FI guys wanting to run 10psi. Plus the 6.0 heads are better in almost every way then the 5.7 LS1 heads and the 5.3's
If lower compression is what you want you need to try and trade the 5.3's for the 6.0 truck heads. The 6.0 heads will take a stcok LS1 from 10:1 down to 9.4ish:1 CR. Works greak for the FI guys wanting to run 10psi. Plus the 6.0 heads are better in almost every way then the 5.7 LS1 heads and the 5.3's
#13
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Whats the biggest valves you can put in 5.3s, I know you have to put new valveseats ,can you put 2.05 and 1.6s??Bore will be 4.030 also are 5.3s 61cc,s?How much can you mill a 5.3?
#14
10 Second Club
I love the 5.3 heads. They flow 300 cfm at .600. TEA is the place to ask the questions about what you can do with the 5.3 heads. Look in my sig and you can see what I got with them.
#15
What kind of numbers can be obtained with a pair of ported/polished 5.3's with big valves and all the right hardware. Matched with the right cam and long tubes of course. Is 400+ RWHP unreasonable?
#17
if you go with a nice size cam and a set of stage 2 5.3 heads will it be ok to spray like 150 shot on that compression? i know ill have to retard the timing just wondering if it would be ok
#18
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Originally Posted by ls1/7
if you go with a nice size cam and a set of stage 2 5.3 heads will it be ok to spray like 150 shot on that compression? i know ill have to retard the timing just wondering if it would be ok