Darth_V8r

iTrader: (4)

That is really interesting...

Especially the Fast intakes - you can easily see the AFR heads had peaked and the GMPP LS3 heads were still climbing. Revving higher would even further separate them.

And your point is well-made. AFR 230 are phenomenal cathedral heads, and you've got guys like Martin that hate the GMPP LS3 heads

Wait, wait, wait, cathedral heads are better. Bad Darth! Can't let data and information get in the way of a good opinion

big hammer

Cathedral heads are good. I just don't think the plastic intakes can keep up to a really good cathedral head. Not sure on the msd yet as I haven't seen any ported flow numbers. But a ported fast can't flow near what a good cathedral head can.

Fast intakes are good but they really
Homogenize head test results as they're generally the weakest link IMO

Darth_V8r

iTrader: (4)

99TA - the guy doing that flow data showed that quite well. Even on relatively mild heads, the intake is somewhat restricting flow. But that also shows that upgrading to a fast intake over a LS6 intake is "worth it" even on a stock LS6.

On the street, cathedral heads are great. I'm not saying they suck. I'm just saying when you see that separation in the dynos start at 6500 and just grow, it shows how much the larger CSA rectangle heads really shine at higher RPM. Edit - imagine a good aftermarket LS3 head like the mast or AFR 260 on those dynos below...

Patron

.

A ported Fast intake flows like what 340 to 350 cfm and a Decent pair of Cathedrals flow what 340 to 350 cfm. And it can't flow near a TFS/AFR/Mast cat head? How about a Ls3 head that flows 370 to 390 cfm...... to disparaging to even think of. Let's not even speak of a Ls7 head in which flow is in the 400 cfm realm.

spanks13

iTrader: (5)

That post needs a new thread.

The "worst" LS3 head matching or beating one of the best cathedral heads from 3500 rpm on up...

big hammer

Last ported cathedral fast I seen tested flowed around 285-290 ish. Maybe some guys are getting a lot more depending on the depth of the port job.

Patron

As the little girl from Memphis with JJ Da Boss would say, " off with there heads! Speaking of cathedral heads. LMAO!


Big Hammer
.



I thought I seen or read that a ported Fast flowed near 320 to around 340 with a ported aftermarket 102 intake?

Patron

A few intakes.

https://ls1tech.com/forums/generatio...w-numbers.html

https://www.corvetteforum.com/forums...w-results.html

Looks like your right in saying a ported 102 for cathedral heads flow like in the 290 range @ peak.

https://www.corvetteforum.com/forums...w-numbers.html

Darth_V8r

iTrader: (4)

You poasted somewhere about the rectangles making sense just fo rhe better intake options. Starting to really see how smart that statement was

Patron

Yea I'm past any of this I've just got a few questions I would like answered, Peak Performance is at the top of the pecking order with their stock 102 Ls7 intake. Also sent Mr. Roddy a message about how much RPM he's turning. I'm just ready to show some video's of some Crazy stuff also (like 750+ fwhp and trying for low 9's which is crazy with Factory block and heads). I just Need More $. All the major Spending is over.

Darth_V8r

iTrader: (4)

Don't we all? LOL

big hammer

Too bad fast refused to offer mid runners for their cathedral 102

Patron

Somethings just make No sense, Hammer. They should make them for the Entire line (Ls1 thru 7) of intakes being that there $1000.oo. It's a no lose market as older FAST intake buyers would want to see or buy different runners to see HP diff. + or -. Better said, the RPM differences. RPM does = HP with some Tq loss. Sounds like the Typical thing to do for the aftermarket. MSD just fills in for the Ls1 and Ls7 intakes. FAST thinking I'd bet is : There were More Ls3 engine combinations Sold than Ls7's and the Ls1 & 2 casting is old and mastered by just add a 102 T/b offering.

Patron

They say you ask and the answer will be given:


Not bad at all with a FAST intake 90mm and a 403 that runs 9's....BTW TFS Cathedral heads were used on Both, so let the fussing Continue....LOL! Look at those Cathedrals kick as and taking names....LMAO! The right combination can make HP with basically any style heads Besides factory Ls1 and 2 heads. Heck they even make Hp.

Patron

Guess I'll show this old thread... I try to save a few for myself.

https://ls1tech.com/forums/parts-cla...ete-motor.html

big hammer

Dang almost 15:1 compression

Patron

Mr. Lazear"s old Lsx N/a comp. engine. One of Roddy"s old competitors. Before they got into 8"s with larger engine combinations. Perfect for e85 maybe a point lower and it"s perfect.