Richard@WCCH

iTrader: (3)

Doing some baseline testing and thought I’d share this. I tested 2 ports on a new OEM L92 head with new OEM valves. The head casting number is #12595364. The ports flowed as follows:
Lift____.100”_.150”__.200”_.250”_.300”_.350”_.400” _.450”_.500”_.550”_.600”_.650”
Port 1_ 73.5_109.2_152.9_191.8_224.0_251.5_273.0_291.3_307 .9_319.7_325.6_326.0
Port 2_ 74.6_108.6_152.9_191.2_224.6_253.6_275.1_293.6_309 .4_320.1_326.6_326.6
Tested at 28” water.
4.030” test bore.
I retested the same ports with the intake bolted up. The manifold #12590124 flows as follows:
Lift____.100”_.150”__.200”_.250”_.300”_.350”_.400” _.450”_.500”_.550”_.600”_.650”
Port 1_ 73.0_107.0_148.7_182.8_211.5_235.6_253.6_267.6_278 .7_288.1_294.0_298.5
Port 2_ 74.1_107.5_148.7_181.9_210.6_234.5_253.6_266.4_276 .9_284.7_290.4_295.8
All port runners and vacuum port taps were plugged to force all airflow through the ttb flange. The manifold ports tested were driver side #1 and #5 cylinders. The intake runners tested were not at the extreme ends of the plenum.

Richard

Big-DEN

Bad azz heads to .500" lift for sure and .650" numbers good for about 700HP N/A on extreme app.

Head and intake is very good, very very good. 300CFM with head bolted to the intake.

airflowdevelop

Richard,
What were you using for an ideal radius when flowing the head bare? I assume this is with the OE valve job.

Dennis

Rock_Daddy

iTrader: (8)

You don't happen to have the truck manifold around to test that do you? There was someone that looked to be in the "know" that was saying that not like truck intakes in the past, the stock L92 intake would flow awsome. I think it was said it was better then the car intakes. That is what I have an was woundering if it was true at all.

Phate

iTrader: (2)

Good info Richard, thanks!

383ss

iTrader: (14)

isn't that about the same as what a FAST 90 would so with comperably flowing heads?? I'd really love to see some ported L92's that flow 360 and see how much the intake knocks it down

CHarris

iTrader: (5)

Thanks for the baseline Richard. I really need to get one of these inhouse but am still less than enthusiastic about the $500 prices I've seen

Richard@WCCH

iTrader: (3)

I'm using a 1/2" thick plate with a .250" radius. Perhaps I can post a pic of it.


Richard

NemeSS

iTrader: (127)

thanks much for the info
seems like that intake is not too restrictive, perhaps some light porting work will bring the flow back up some

JZ'sTA

iTrader: (23)

IMO there isn't a ton of porting that can be done of this manifold.
Its pretty good stock.
But even a 5% increase could be awsome.

Thanks for the test's. Great results.
Looks like we have a very top notch combo for a very good price.