LASTOFTHEBREED02T/A

iTrader: (15)

I been looking for heads, and found 2 sets for sale, same price. The first set are 862cast CNC ported 5.3 alum truck head cathedral port 217 cc intake runner 58 cc combustion chamber flows 317 intake 235 exhaust will go on 5.7 it a 6.0 block. The springs are good to 650 lift.


The others are 317 PnP, milled .030, upgraded springs. But seller claims they do awesome to possibly outperform the first set above.

Help me out here once more guys...

TyCZ28

the truck heads seem to flow pretty good and will give you a compression boost... can i have ur 241's when you take them off haha

LASTOFTHEBREED02T/A

iTrader: (15)

Thats what i though, but then again, im not sure how much compression you can get off the milled 317. The 241's will be goin up for sale, they have new retainers, new valve seals, 6k Miles Tsp behive springs.

TyCZ28

i wouldnt do milled heads man.. thats too much worrying when it comes to PTV clearance in the future if you upgrade cams.

LASTOFTHEBREED02T/A

iTrader: (15)

Im not going any higher than the 224 cam it already has... Im happy with it.


Ok, so One person so far says stay away from 317's, anyone else please feel free to give your .02

A.R. Shale Targa

iTrader: (2)

The TQ gain in NA form will be noticeable from the 5.3 heads whereas the 317
heads while milled .030 and approx 66cc chamber volome will only keep your
current compression ratio unless you were to run thinner head gaskets. This
could change your lifter preload/pushrod length as well. The 5.3 heads with
factory gaskets will be about 11.1 compression

LASTOFTHEBREED02T/A

iTrader: (15)

Thank you for the break down, its more or less what i needed to make my final decision...

Anyone else with pro's and con's please give input... Thanks all.

BigBirdLS1

I've got cnc'd 5.3 heads with a 224R cam. Compression is 11.1 and I made 445/428. I love it my small "baby" cam consistently performs and out does alot of the donkey dong cam cars out there. Plus OP that small cam will benefit from the compression...compression is "free hp"

LASTOFTHEBREED02T/A

iTrader: (15)

Looks like I'll have a similar set up to yours, If i ball park anywhere near your numbers, im set.

Thanks guys, this really helped in making my decision.

BigBirdLS1

My car is an M6 with the factory 10-bolt. OP is yours an auto or M6. Just a lil more info my car picked up 38rwhp and over 20rwtq just from the head swap so I was impressed.

LASTOFTHEBREED02T/A

iTrader: (15)

Mine is an A4 with stock 10 bolt... I know autos numbers are lower, but it really comes down to the performance. Details in sig, if you are using phone it wont show.

Was the CnC done by one of the sponsors? Cathedral port? Any other details?

BigBirdLS1

The 5.3 heads are the stage 2.5 the TSP offers they are a sponsor here.

lemons12

iTrader: (71)

You will have zero issue with clearance, even if you wanted to move up to a larger cam.

My old cam (226/228 .588 114) was made in mind with these heads and an ls6 intake, a very close combination to what you are running.

The 5.3s that guy is selling will work, I have zero doubt.... I know my heads will out perform them however.

Think about it... I had an average run of the mill set up... Stock intake, normal 5+ year old grind cam, 373s, full weight, average DA for my track, etc etc... The only thing different than most the other H/C cars that run at my track and the ones I raced were the heads... And I consistently beat Ms4 H/C cars, other baby-mid size cam cars, etc etc.. At the track and from rolls on the street. I was trapping 2-3 mph higher than them, similar weights (most were running PRC heads, FAST intakes, etc...) so it wasn't the intake, it wasn't the cam, etc..
The heads work.

FWIW... I sold these to my best friend, he bought them to use in his build with no "proof" other than how much above average my car performed for the mods. I am making 0$ off of these heads if you buy them... I just want you to get the most for your money, like I always have in the past.

LASTOFTHEBREED02T/A

iTrader: (15)

I am sure you are trying to help like you've always have, and thanks to you, my ride runs the way it does.

But everyone swears on their Momma that 5.3's will boost my compression and are the better choice over 243's/317's or equivalent.

They are telling me to stay away from the 317's, and if they are milled they will never match the compression of the 5.3 862casting.
These heads have been worked by TSP (CNC cathedral port Etc) .650 springs they are 5.3 truck 862's. And locally they tell me thats the best choice i want to go with.

I havent bought these other heads, just because im waiting on a direct comparison on why your 317's are better.

TyCZ28

A lot of cams that i would consider a bigger cam (tsunami, Mayhem 2, polluter) would result in a valve kissing the piston with milled heads. just my $.02

Theres a reason alot of people run TSP stage 2.5 (5.3) heads... the compression bump that comes with the chambers is worth it.

for a comparison: (just going off what the typicals are for the ported 6.0 heads)

Stock 317 are 71cc chambers, 210cc runners and flow 240/177
Ported 317 are 65cc Milled to the Limit of the head, and flow 313/220 on average
Ported stage 2.5 862 are 58cc chambers, 217cc runners and flow 317/235

LASTOFTHEBREED02T/A

iTrader: (15)

^^^^ This is what i was looking for, and cant argue with that. The flow numbers of the 862's match the numbers from the ones I was consider buying.

Lemons, Im going to have to go with popular demand this time around... Thanks for everyones help. Going off to seal the deal.

lemons12

iTrader: (71)

The 5.3s will help compression but smaller cams don't have to rely on compression like the donkey dick cams, large cam shafts HAVE to have compression to run optimal. That is the reason I'm not worried about compression with my little 226 cam but if I had an Ms4 cam I would say go with the 5.3 2.5s and fly cut. The 226 wouldn't need as much help down low/mid range but would need to breath up top, the Ms4 would be the opposite.. My 317s would give you more mid-top end, where the little 224 cam/ls6 intake combo is going to lack....
Same with a 224...

That is why I say go with the heads I ran.
You do realize that the polluter won't clear the 2.5s, correct? Or Ms4, Trex, Ms3 is VERY close. He isn't going to a donkey dick cam.... But if he was to step up he would have no problem running a low 23X/23X high .5XX 11X type cam.

I know why people run the 5.3 2.5s... I don't need a lesson in that. I have also seen a direct example of why I would choose my 317s over that for the combination the OP is running (over and over again). I was one of the main factors he has the mods he does have.... And from what I gather, he has been ecstatic with the car so far. Think I would have a decent idea of what heads would match his combo a bit better? My car would not have ran the ET/MPH it did with 2.5s... Otherwise you would see a lot more small cam full weight 5.3 2.5 cars knocking on 6.XX @ 95+ in the 1/8 with plenty more left in the combo.

You can argue with that...

Yank is the popular choice...
PRC is the popular choice...
TREX is the popular choice...

I could go on and on. My point? Popular choice isn't always the best choice. Popular choice usually will get you popular/average ETs, I try to get one step above that with every combo I run.

Glad you got a set of heads, car should run excellent after the swap.

LASTOFTHEBREED02T/A

iTrader: (15)

I almost feel as if i betrayed my teachers here on tech... But if im not happy with the numbers, i will just take the heads off, sell and buy different ones. Just playing it safe. Im doing the work myself, and retune is only 100 bucks, so let me learn the hard way or be impressed by my choice.

Hope i can still count on some future advice...