prc 2.5 stage 5.3 heads on an lq4
02-11-2013, 01:36 PM
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prc 2.5 stage 5.3 heads on an lq4 Anyone have any experience w these heads on an lq4 6.0? What's it place your compression at? Milled and unmilled? HP and tq gains? They seem to be a good option as opposed to finding factory heads and paying for a port and polish job.
05-08-2013, 09:20 PM
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So I'm thinking I'm going to go with the 2.5's. but I'm still researching
05-09-2013, 04:55 AM
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I had a thread real similar to this asking about the same heads on an LQ4 as well. he majority of people on here told me they would rather use 243/799 heads than 5.3 heads. They flow better and have larger valves. I just used a .040 head gasket to get some of my compression back. I am sitting around 10.5:1 right now on my stock bottom end LQ4 if that helps any.
05-13-2013, 09:52 PM
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I had a thread real similar to this asking about the same heads on an LQ4 as well. he majority of people on here told me they would rather use 243/799 heads than 5.3 heads. They flow better and have larger valves. I just used a .040 head gasket to get some of my compression back. I am sitting around 10.5:1 right now on my stock bottom end LQ4 if that helps any.
05-16-2013, 01:12 PM
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Did you find more info on this? TSP told me to run these heads instead of the l92/ls3 heads because it would increase my compression to around 10.5 or 10.6. Whereas with the l92/ls3 it would be low at around 9.6 with the dished pistons.
So I'm thinking I'm going to go with the 2.5's. but I'm still researching
So I'm thinking I'm going to go with the 2.5's. but I'm still researching
05-16-2013, 05:03 PM
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If you have the cash, buy them and get a cam ground for them on your 6.0. I had plans for a similar set up but I sold my top end for school tuition. The lq4 will take abuse like all GM motors.
My plan was
a set of cnc 706 that flows 298 cfm @ .600 ( flow bunched local for confirmation)
A tsp ? .233/239 ? @109
Pushrods, cheep *** ls7 lifters and ls6 intake.
I got the heads for 250, the cam and lifters for 100 ( new and cheep) to go In my TransAm
After using an online compression calculater, I saw a ratio of 11.0-1 with the head at 60.5cc witch is fine with a compstant tuner and pump fuel. Look on yellowbullet.com and research. You will see plenty of lq4, 5.3 heads and runing fast.
The person I sold my combo to blew up 2 stock Trans , 2 stock 10 bolt and smoked a bike on the highway with a 150 nozzle kit.
5.3 heads are great. Use them and spend mony on other things.
My plan was
a set of cnc 706 that flows 298 cfm @ .600 ( flow bunched local for confirmation)
A tsp ? .233/239 ? @109
Pushrods, cheep *** ls7 lifters and ls6 intake.
I got the heads for 250, the cam and lifters for 100 ( new and cheep) to go In my TransAm
After using an online compression calculater, I saw a ratio of 11.0-1 with the head at 60.5cc witch is fine with a compstant tuner and pump fuel. Look on yellowbullet.com and research. You will see plenty of lq4, 5.3 heads and runing fast.
The person I sold my combo to blew up 2 stock Trans , 2 stock 10 bolt and smoked a bike on the highway with a 150 nozzle kit.
5.3 heads are great. Use them and spend mony on other things.
