So what the difference between some milled 862s and some stock 243s? Also how big of a difference would the 243s and a nnbs intake do on a 2003 4.8?
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So what the difference between some milled 862s and some stock 243s? Also how big of a difference would the 243s and a nnbs intake do on a 2003 4.8?
Not to thread jack but I'm interested in this myself. I've read that 862 ported and milled will do wonders on the 4.8/5.3. 243 would have to be milled from my understanding just to get back to factory type compression. I could be very wrong but I'm going to have a set of 862 worked and see because they are usually cheaper. Hopefully someone with more knowledge and experience will chime in.
Yea i'm wondering the same i myself have some stock 862s but since my brother removed his 2010 4.8 it has 243s if their worth it ima get them for my 2003 4.8Quote:
Originally Posted by Slow04xcab
If you can get the 243s cheap then I would probably go that route if your running the cam in your sig. I would think just milling those to get back to stock compression would be a nice upgrade and may be cheaper than working the 862. I would also contact your tuner because if you aren't already you will be pushing the limits if your still running stock injectors. Just a thought. Hopefully some one else will shed a little more light on this.
The reason 862s work well is because they can achieve a higher CR. The 243s flow much better but require a heavy mill to get the compression back to stock.
Well id i do the 243s i'm also getting the nnbs intake which come with the 36lb injectors i believe so i think i should be fineQuote:
Originally Posted by Slow04xcab
May also have to worry about ptv clearance as well with 243 if your doing a lot of milling
what you want to spend on a set of 799/243 heads
You looking to get rid of a set George? PM me if so...I may be in the market.Quote:
Originally Posted by George C
I got some already but thanks for the offer!Quote:
Originally Posted by George C
Put wellQuote:
Originally Posted by pl4yboy
I've got ported/polished/milled 862 heads on a 5.3 and I have to say that they did wonders vs. being in stock form. I couldn't say how much HP they added because I did a cam swap at the same time. They're currently going back on that same block just bored to a 5.7 this time around.
How much did it run you to get you lr 862s worked on?Quote:
Originally Posted by suburbazine
$600ish for the port & polish on top of $250 for the millwork and spring install. The shop I used doesn't do port & polish very often, I only got it done because I was a regular customer.
Badass broQuote:
Originally Posted by suburbazine
AI is supposed to have a killer CNC program for the 862 heads.
Thanks bro i'll look into itQuote:
Originally Posted by ss454327