bowtiguy

Richard at pro heads is a GREAT guy, but my engine builder flowed my WCCH LS7 heads ( milled 30 thou) and they didn't flow much more than stock ( they don't touch the exhaust at all). Same engine builder has the Lingenfelter heads on his 07 C6Zand they scream!

He has the texas speed LS7 heads on his 416 L92 motor in his 40 ford coupe and runs 9.9X with 1.36 60' here at elevation ( Bandimier).

I'm running 454 cubes so the heads are the limiting factor now. I'll be going with the "hand finished" 405/280+ LPE heads/springs/cam package this spring.

BTW, I'm at "about" 12:1 C/R right now, run 91 here in denver area and we get NO knock!

bandit0220

Very cool to hear got to love elevation for some things hahaha even if it still limits the power. Tell me more on these LPE heads sound like some mean heads!!!!

bowtiguy

http://www.lingenfelter.com/store/c6ls7zo6cyl-01.html

I used to think .650 lift cams were CRAZY..but my car idles smooth as silk after Rod tuned it with Hp tuners. LPE specs some large cams for these heads requiring some stout springs ( available from LPE) but just look at that GT21 cam at .700+ lift.

I've driven NitrousJunkies car with these heads and cam and after A LOT of tuning he has the tune figured out and it drives just fine. For those who have said there are no gains in porting LS7 heads..just look at these flow #'s..they are even higher with the extra $225 "hand finishing" option.

I will be feeding the extra cubes with thee babies this spring., should get me close to 600Rwhp with great street maners...not that an extra 30 hp is going to make a difference but I tossed the warranty at 6 miles on the odometer,....so why not???

DSteck

I find it odd that you'd mention the exhaust isn't touched at all, because that's the only side that Richard ports. Hogging out the intake side doesn't net any performance improvement considering the intake manifold chokes the crap out of the heads anyway, even if the manifold is ported out. It's kind of hard to see, but material was notably removed from the exhaust ports. It's pretty obvious why they wouldn't flow more than stock on the intake side, but I can assure you that the exhaust side of my heads was ported out. Otherwise, I don't know where the extra 50rwhp came from.

6Speeder

Well, they're on now, so I'm not pulling them to check. I'd be interested to see pics of yours to compare. Are you running the same cam?

BTW: We did check PTV and still have 20 thousands clearance, so I'm OK there.

bowtiguy

Its been a long week alreayd an its only tuesday???

I meant to say the intake wasn't touched. I ran the stock Ti intake valves and upgraded to solid stainless exhaust valves and then had them both DLC coated.

Back when Richard did my heads, they were the ONLY proven head porter that I could find, but times have changed and nearly 12 montsh later we all have more options. Best way to gurantee #'s is have them flowed prior to install. I plan to do just that on these an dthe new heads ..assuming I don't use them as porting cores.

In regards to stock intakes. Charlie at RPM squeezed another flow bench verified 23 cfm out of each runner w/o the heat sink of a sheet metal intake.

DSteck

Well for half the cost, my heads are supporting the same power numbers as other companies.

bandit0220

I have a RPM intake on my car and it did make a noticable difference. As to the heads lets think this in a real world type scenerio shall we. The stock head I verifed too 371 cfm at 650 lift since I have just around that on my cam and a little less on the exhaust no need to worry about more flow at higher lift as I dont plan on going to a higher lift. At 371 cfm at 650 lift this head should be able to support roughly 764.2 flywheel horsepower. So why would upping that help that much???? Now I do see the exhaust side showing some nice gains but with that also comes a cam change to take advantage of the higher flow. If you are already running a cam that crutches the exhaust side by a good amount your already helping the lower flowing exhaust. I have 257 dur on the exhaust side where I only have 243 on the intake side. This is why I am doing this the way i am do I need ported heads who knows. Will it help, maybe, maybe not but I acually KNOW compression will help. As long as its not excessive and the compression is usable,it will always add power, add response, and add to the thermal efficency of the engine. SteckDW I am not saying ur wrong but 50rwhp from hogging out the exhaust without a cam to take advantage of it sounds rather HIGH. But what were the heads milled too if any could you find out??? Just some insight on why I am wondering if alot of gains are from milling and not porting. Not to say that porting does not net a gain but for me I want to see what the gain is for each, guess I just like to do my own R&D.

DSteck

There's been a host of other QM600 cars that picked up a TON of power from simply porting the heads... I don't know why you're in disbelief. That cam wants a high flowing head, no question. I'm definitely not saying 50whp on a stock cam. Richard only did clean up passes on my heads. Exactly how much material was removed, I don't know, but I know it wasn't more than a few thousandths. Here's a picture of the mating surface to give you an idea of what the combustion chamber looks like.

6Speeder

If you look at the chambers on the opposite side from the spark plug you'll see that it isn't round anymore, all the "quench" area is gone, and the chambers are like mine, heart shaped. (Compare to the pic of my stock head). I don't know how much you have to mill to lose that much chamber, but mine "appear" to be milled about 30 thousands.

DSOM Z06

The Vette Doctors are doing some very exciting things with their ported heads/cam package, right DOMSCOM????????

rattt g

i think i am going under the knife soon
can't wait for the sick stick and the new heads

bandit0220

looks like a bit more than a couple thousand but could just be from the angle. An I didnt say I am in disbelief at all I said I want to see for my self what compression does for the engine and then porting on top of that if Im still unsatisfied. An trust me while the QM600 is a pretty healthy cam and I know cause I have one the cam Im runing now destroys it in every part of the rev range, even though the numbers are similar its all in the lobe sep and the timing events.

Jorday

Do you have any dyno sheets or track results that actually back up these types of claims which you are constantly making, or are you just guessing how much power your car has?

bandit0220

cause 50rwhp from just porting the heads would be the largest gains anyone has seen yet

DSteck

I don't have anything scanned from after the heads. Apparently my scanner isn't compatible with Vista x64.

I'm still on stock pushrods, and it's not floating valves. My heads didn't have a perfectly rounded combustion chamber to begin with when they were pulled, and if you look, you can see that mine have way more material left. The intake side of the combustion chamber always has that heart shape.

6Speeder

Mine dyno'd 444 stock, 493 with all bolt ons, 543 with bolt ons and cam, and after Christmas I'll dyno with the heads added. All numbers SAE, same dyno. Truthfully, I'm looking for 30 to 35 additional rwhp. Anything past that will be gravy.

bandit0220

Well I gained 28 rwhp and 24 rwtq from the raise in compression alone it was a gain throughout the entire rev range with majority being from 4200 too 7100 rpms WOOOHOOOO I am not disappointed at all!!!! I dont know what my corrected numbers are I am at 4500 ft above sea level and did 548 uncorrected

0Myhardtop

Porting the heads on these cars is a nice touch final touch to your cammed package.

In my opinion, porting these LS7 heads w/o doing some milling is a waste of time and money.

We have seen little HP gains from cleaning the heads, but once the milling and better porting enters the mix, greater power was recognized. On the average, we see around 35rwhp gains, although I’ve seen higher with higher comp ratios (between 11.8 and 12.2). Tuning plays a big role and believe me, close to sea levels, you can have as much as 12.0 comp ratio and drive on 93 oct with no issues whatsoever.

Here is a tad bit of info…this may not be new news to many of you: a nice port job with at least .040 thousands milling, 0.040 thousands thick Cometics gaskets with the correct pushrods length with tuning is a good start for tire shredding power. Of course, adding the QM600 cam simply adds the icing on the cake. Oh yeah, in some vehicles, switching to a cooler plugs such as the NGK BPE7S F allows you run more timing if necessary and it also minimizes the chances for detonation. I’ve seen as much as 5rwhp gains from these plugs and not knock after repeated back to back runs on the dyno and romping on the streets.

Thanks,
Carlos

PS, who wants one of my old set of ported LS7 heads? Includes pushrods…these heads have 500 miles on them; I cleaned them up and they look as good as new. I also changed the spring assembly just for because the heads sat there for ever…they are also milled 0.40 thousands. All you need is gaskets and bolts and that’s it! $2,850 and yours…no exchange, this is an outright price and remember, one piece chromoly pushrods alone are $200 plus.

J HEBERT

For what its worth, hog out the exhaust to get the int/exh balanced better. But if u start foolin' around w/ the intake too much, there will be port flow velocity debit on the bottom end. At some point, it makes no sense to increase intake port flow at the cost of velocity when the intake manifold is marginal at best when fully ported.

But, the exhaust on the stock LS7 head sucks compared to intake flow, get it to 75+% of intake flow and u got somthing....and ohh, u won't need all that exhaust duration and overlap