jlcustomz

Yep, buy e-3 plugs, sponsored by dustless blasting.

00pooterSS

iTrader: (40)

Gotcha. I see that they are working for people I just hate the massive gap around the cylinder with them. It's what like 87 thousandths on a truck bore? Gotta be bad for quench, or at the minimum not as good. And I want quench as perfect as possible on my stuff.

Ah, I knew the notch needed the graphite, didn't realize some of the 5.3 heads had the notch. The one's I've pulled didn't, although it's been a long time so I could be wrong. I learned about the notch and MLS the hard way when a buddy handed me a set of notch heads and LS3 gaskets to use on his 4.030 stroker. That blew to watch it puke on the dyno. Fortunately a couple hours and it was fixed. Funny part is the dude had some TSP stage 2.5 heads in the garage and for some reason didn't tell me and had me use old perimeter bolt heads with the notch lol.



I personally would never do the LS9 on a 3.78 or even a sub4", but that's me. It appears to work, but I've seen wrenches work as hammers before as well.

tech@WS6store

iTrader: (2)

We have both gaskets for up to 3.910 bore and then another gasket for 4.065 bore.
Gm discontinued the graphite gaskets so the only option was still a flakey nasty aftermarket gasket until these.
Still quite a few early 4.8, 5.3, and 5.7s that have heads with a notch, but afaik no one offers an mls to use a set of notched heads on a 4" or larger bore but us. A few companies that cnc alot of 5.3 heads have bought them in bulk from us. Saves alot of time and extra cost in the head of welding up the notch and surfacing vs just buying a gasket.

wannafbody

iTrader: (2)

You'd have to talk to TSP. The flow numbers are fairly close, within about 10 cfm or so.

axe murderer

iTrader: (3)

Pretty sure 1 reason why years ago the TSP CNCed 5.3s were the hot ticket.
Problem with the 5.3 heads is the Castech castings are known to be bad

kinglt-1

iTrader: (26)

Yep...for years the TSP 2.5 5.3's, MS3 cam, and Fast 90 was a proven 450whp/380wtq combo for a 346. I want to say TSP sold the heads cam package for around 15-1700.00.

I would of went with a different cam that brought the torque up around 400 even if peak power dropped to 435. However TSP probably sold thousands of the combo above.

HCI2000SS

iTrader: (2)

For the money I'm very happy with my TSP 2.5/5.3 heads. My cam is almost identical to the MS3, and I'm running a Fast 92 as well. Whatever my top end lacks I more than make up with it with the 150 shot

mpac3131

706/862 is a diamond in the rough. In my opinion they are one the best cathedral port heads for a budget if you know what your doing. They will flow well into the 300’s at .600 lift without CNC porting.

When I was still in the head business I had a set of 706’s that I worked for my own setup. 5 angle valve job to 2.00/1.600 with a custom top cut, bowl blend, back cut the valves and a couple little minor things they did very impressive on the flow bench.

I believe I had a 3.900 bore fixture on, but they flowed around 310ish at .600 lift, I believe it started to get turbulent around .800 lift. Nothing really crazy done.

Most people don’t realize about 85% of your gains from porting is in the valve job and bowl blend. If you can handle a burr outside the 350-400 bucks you’ll have in machine work you’ll out perform a lot of aftermarket heads too. The goal is the most air though the smallest port...

kinglt-1

iTrader: (26)

Not bad...I believe my 61.5cc TEA Stage 1 243's flow 312 @ .600 on a 3.9 bore plate. The more impressive part tho is their mid lift numbers. I believe even @ .500 lift they still flow over 295.

RonSSNova

iTrader: (3)

Ding ding ding.
Nice to see a real world comment on head work.

Ron

stp001

WS6TECH, Online, you still have bit of an issue with ordering the right gaskets. I just recently bought a head/cam gasket set. In this set, I received the GM MLS gaskets for the later heads. I have the 853's. All that was listed was LS1 perimeter and LS1 center bolt. Of course I didn't realize there was an additional difference until I started matching things up. Then I had to order another set of the "blues", which I never even looked at after seeing the set that had everything I needed. You probably need some kind of questionnaire or additional drop down option with the gasket sets to insure correct gasket sets. Of course, Mike said I could return them, but I had already opened them and destroyed the packaging. I am not mad about it, because I caught it. I feel sorry for the fellas that don't.

tech@WS6store

iTrader: (2)

We do have then listed individually on the site of course but dont really mention them in the gasket sets like head install.
I will be trying to add that option shortly. we are switching to a new site and its painful to say the least. Thank you for the input. If you didnt install the gaskets or scratch them, we can def take them back if you wanna send em.
I have notated EVERYWHERE on the notched gaskets they are for notched heads lol but doesn't help when they arent an option on the heads cam kits.

gjestico

iTrader: (5)

If the HP is coming from compression in that test, be interesting to try flat top pistons in the 5.3 with the 706 heads. Around 10.4:1 .

Formula81

So im a newbie in the cylinder heads area. Lets say you have both the 706 heads and the 243 heads and you want to get them milled or ported, which ones would you do after seeing this? dont know if this helps because i know there are a bunch of different ways at working on the heads, but i was looking at spending around $400 to $500.

omc8

iTrader: (7)

I have found a number of inconsistency in the test from what I can see . Ill point out a just a couple . First the 706 flow numbers.... these must be factory freaks because the 5.3 heads that I have flowed are in 220s and climb very little after .500 .But the ones in test jump 11 cfm alone from .500 to .600 and peak at 237. At first I thought this is just a very generous flow bench , but thats not consistent either . Because the numbers for the 317 seem to be pretty much on par. And I can accept the 799 numbers being low . Here is why the 799 can have some core shift that will create insert overhang in the bowl. this may explain them being approx 10 cfm off. A 243 should flow in the 250s .This test has a 17 cfm difference @ .600 between the two. Do another test 706 vs 243 there should be 30 cfm difference between to two.

big hammer

Overall flow doesn’t mean everything

G Atsma

I like to look at low-lift flows to see how efficient they are. THEN I see if it carries thru the higher lifts. If solid flow improvements are seen at all lift levels, it's a good head in my book.

tech@WS6store

iTrader: (2)

Right, but in the other part of the test it also dominated all the rest as well.

Without actually having the graphs to play with or overlayed its very hard to tell whats up on the rest of it though.

wannafbody

iTrader: (2)

TSP will CNC port 243's for $750. Since they have the larger valve, I'd stick with them. Unless you want a bit more compression, then get the 706 CNC ported to stage 2.5. Either way, the cost is about the same.

big hammer

Like GMPP 243’s!