big hammer

There's also strokers out there with aftermarket cathedrals stuck in the 12's.

KCS

iTrader: (20)

I interpret the data differently I guess.

Tuskyz28

Big Hammer.... what drug is you smoking? If my job didnt drug test me I'll be willing to give it a shot.

Nobody disputes the power a TFS 235 makes on a 402-418. They make anywhere from 525-575rwhp. But it's rare to find an L92 head making the same power on a 402-418. Good luck trying to do so with a L92 head.

Again you toss on a single plane intake and a solid roller to make magic happen. Im one of those guys that can care less about cutting on my car, running a carb, or running a high maintence solid roller setup. I rather DRIVE my car than to be working on it all the time not to mention ill have better a funner time keeping the car out the ditch from all the torque.

Anyway.... let me toss around a couple PROVEN builds. Some on tech here and some in magazines.

Ls2bait-99 SS full weight car, LS3 416 tfs 215s, 10s on motor, 9s on juice. M6 car, featured in gmhtp... member here as well

LSmokin1- 402ci motor with afr 205s, pat G cam, 2000 M6 intake, car run 10s @ 130

Mike- ws6 m6 car, 3700 lb with driver, 402ci with TEA TFS 235s, Pat G cam. Car runs 10.4s @ 132 mph.

Briancws6- m6 ws6 403ci motor with AFR 230s with 247/251 cam. Car runs 10.55 @ 130 mph.

SilverLSwon- 376ci motor with tfs cathedrals 220s as cast. Car run high 10s on motor with vindicator cam. M6 car

vandyke- 408ci with PRC 247 heads. M6 car ws6 251/259 cam. Car runs 10.55 @ 130.
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Vengeance Racing lsx block 427ci M6 with tfs 235s trapping 133 mph/running 10s on drag radials skating on ice all over the track.

​​I can keep going.... but anyway all the cars above is running a hydraulic roller, and a fast 90-102 mm intake, pump gas, and not gutted/ cut to hell and back. I didny post any auto cars cause they easy to get down the track... but if i did ill remind you of James Day SS running a 6.00 @ 114 in the 1/8 mile with a 445ci with TFS 235s, hydraulic roller and a fast intake on pump gas at 3150 lbs.

I already said it once so im not go say it again.. COMBO IS KING!!
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big hammer

Interestingly slow. Rectangle ports have been 7's NA

big hammer

Also interesting how it's in the combo now all of a sudden too. Like 12 second aftermarket cathedral port strokers

KCS

iTrader: (20)

Not on pump gas.

SoFla01SSLookinstok

So what?

Me, me, me...

So what?

All of a sudden?? Lol

handyandy496

iTrader: (9)

I especially love that the ls3 heads surge but the cathedrals never do.

KW Baraka

iTrader: (7)

Been mentioned or implied over a dozen times in just the past month.

LS3 heads surge primarily due to their larger intake valve size coupled with excessive cam overlap.

KW

big hammer

any cathedral port ls running 7's on race gas?

KCS

iTrader: (20)

I wouldn't know. Just pointing out that Tusky is talking about pump gas combos and LS3 vs cathedral ports. The combos you're trying to compare them to are on race gas and the "rectangle ports" in them are almost nothing like the ports in an LS3 head.

Tuskyz28

Thats right. The Fastest naturally aspirated cars are all running a C5R/cantned valve or mozez heads. They also all running single plane intakes with solid rollers on race gas.
However its something to see some of those combos that have 7 grand heads on them get beat by a TFS cathedral head with a Fast intake.

MuhThugga

I think people are losing sight of the fact that the LS3 head is a good budget head that can make power without needing to spend a fortune in the process. Would an aftermarket cathedral casting make more power somewhere in the RPM band? Maybe, but after selling my factory cathedral stuff, I was only about $250 out of pocket for the LS3 head swap.

They surge due to intake reversion, as KCS said. The large intake valves and high degrees of overlap don't play well together. If you keep the overlap down, then the surging is minimal/non-existent. Also, don't even pretend like people don't get cam surge with cathedral heads. That **** happens all of the time.

Tuskyz28

I know a guy with a 402ci motor that have played with all kind of heads and cams on his M6 ws6. 3680 lbs with driver.

Once ​​​​​had cnc ported L92 heads and a edelbrock single plane intake @ 11.7 compression. Car went 10.84 @ 127 mph with a 1.44 60ft. Best pass period. Most passes was 10.9s.
Combo made 520 rwhp....

Time went on and he wanted to make more power and go faster at the track...

On went a Fast 102mm ported by vengeance and a pair of TFS 235s from TEA with a cam to match. Compression with the tfs heads was 11.5. Car made 545 rwhp and gained 15tq all threw the torque curve. Went to the track and went a 10.65 @ 130 on a 1.55 60ft.
Tires was shot on that pass from running the car so much on the L92 head setup. He put a set of new tires on it and went back agian and ran a 10.45 @ 132mph with a 1.42 60ft with both front wheels in the air. Car still has heat, air conditioning, back seat, strereo etc...

big hammer

I know a guy who went around that speed with just a bolt on c6 ls3 vette

big hammer

So not cathedral ports interesting

Tuskyz28

Top 10 fastest is not running a LS3 heads period. Afteemarket Ls3 or cnc heads.... not one in the top 10 however I see a 245 TFS cathedral in the top 10 fastest.
​​​
​​​​A LS3 wants to be a Ls7 head but its not .

big hammer

So the fastest NA ls aren't running any form of cathedral port. Good talk

KCS

iTrader: (20)

He's saying cathedral port heads are running faster than LS3 heads:

​​​

KW Baraka

iTrader: (7)

Anyway........I think it's cool as hell that AFR has decided to step up with a LS3 casting!

KW