WTB - Complete LS3 Intake, LS1 Intake, LS3 Rockers - Page 2

Jimmyz18 · 11-12-2013, 08:57 PM

Quote:

Originally Posted by SLOWGREEN73

I got a ls6 300.00

is this a motor?

1998ta__1991rs · 11-12-2013, 09:10 PM

square ports make good power but a cathedral port will run circles around them at the track

jmd · 11-12-2013, 09:35 PM

Quote:

Originally Posted by 1998ta__1991rs

square ports make good power but a cathedral port will run circles around them at the track

well I guess that is why no cars with ls3's are ever at the track.

BigdaddyDupree · 11-12-2013, 09:50 PM

Mine runs good at the track with square ports.

1998ta__1991rs · 11-12-2013, 10:00 PM

Quote:

Originally Posted by jmd

well I guess that is why no cars with ls3's are ever at the track.

im not saying they dont run good, but the fastest non canted valve ls cars have cathedral ports. flow numbers dont always mean everything

DIGGLER · 11-12-2013, 10:02 PM

$1200 for a brand new set of factory heads that flow 315ish cfm is a pretty kickass deal, imo.

94FormulaBird · 11-12-2013, 10:17 PM

Quote:

Originally Posted by Jimmyz18

is this a motor?

im sure its an intake manifold

Pesce Nero · 11-12-2013, 10:43 PM

so I just ran the numbers on Dupree's trailblazer. I got over 540hp using his MPH and weight.

who here with Cathedral ports is better than that, just wondering?

GreebeanZ28 · 11-12-2013, 11:09 PM

Quote:

Originally Posted by jmd

well I guess that is why no cars with ls3's are ever at the track.

Ran my square port car sunday lol. Slowest car i got!

GreebeanZ28 · 11-12-2013, 11:28 PM

Quote:

Originally Posted by blkscls1z

I'd like to hear more from these head porters as to why these heads are garbage?

Not really garbage, but results on anything with less than a 4.060 bore get trashed by cathedral ports. Valve shrouding and a big ass chamber seem to be causes. I was also told that people blow it on cam selection for these heads badly. "Where most guys blow it is not closing the intake valve soon enough. With the air flow the square ports have, and how large the valve is, air speed is very high at low lifts. This doesn't need much valve overlap to help accelerate the charge into the cylinder." Guy went on to say that the heads are super picky to cams and the window of valve events to make good power is much smaller in comparison to the cathedral ports.

Just what I was told.

Matts94Z28 · 11-12-2013, 11:31 PM

Quote:

Originally Posted by GreebeanZ28

Not really garbage, but results on anything with less than a 4.060 bore get trashed by cathedral ports. Valve shrouding and a big ass chamber seem to be causes. I was also told that people blow it on cam selection for these heads badly. "Where most guys blow it is not closing the intake valve soon enough. With the air flow the square ports have, and how large the valve is, air speed is very high at low lifts. This doesn't need much valve overlap to help accelerate the charge into the cylinder." Guy went on to say that the heads are super picky to cams and the window of valve events to make good power is much smaller in comparison to the cathedral ports.

Just what I was told.

inb4roadcone

Pesce Nero · 11-13-2013, 12:00 AM

Not really garbage, but results on anything with less than a 4.060 bore get trashed by cathedral ports.

duh

Valve shrouding and a big ass chamber seem to be causes.

68cc is a big ass chamber?

I was also told that people blow it on cam selection for these heads badly. "Where most guys blow it is not closing the intake valve soon enough. With the air flow the square ports have, and how large the valve is, air speed is very high at low lifts. This doesn't need much valve overlap to help accelerate the charge into the cylinder."

not enough compression

Guy went on to say that the heads are super picky to cams and the window of valve events to make good power is much smaller in comparison to the cathedral ports.

big comp, big cam. little comp, little cam

Just what I was told.

ElecTech · 11-13-2013, 12:55 AM

Quote:

Originally Posted by Pesce Nero

so I just ran the numbers on Dupree's trailblazer. I got over 540hp using his MPH and weight.

who here with Cathedral ports is better than that, just wondering?

Crankshaft power?

Pesce Nero · 11-13-2013, 01:12 AM

Quote:

Originally Posted by ElecTech

Crankshaft power?

yes

Miker · 11-13-2013, 01:15 AM

Quote:

Originally Posted by DIGGLER

$1200 for a brand new set of factory heads that flow 315ish cfm is a pretty kickass deal, imo.

$1450 for GM ported LS3s, and a GM cam.

blkscls1z · 11-13-2013, 02:35 AM

Quote:

Originally Posted by GreebeanZ28

Not really garbage, but results on anything with less than a 4.060 bore get trashed by cathedral ports. Valve shrouding and a big ass chamber seem to be causes. I was also told that people blow it on cam selection for these heads badly. "Where most guys blow it is not closing the intake valve soon enough. With the air flow the square ports have, and how large the valve is, air speed is very high at low lifts. This doesn't need much valve overlap to help accelerate the charge into the cylinder." Guy went on to say that the heads are super picky to cams and the window of valve events to make good power is much smaller in comparison to the cathedral ports.

Just what I was told.

Yeah you just can't throw in a (Insert Speed Shop's witty cam name here) and go. Unfortunately that has seemed to give them a bad rap.

minytrker · 11-13-2013, 02:52 AM

LS3 heads are hard to beat for the money. Like already mentioned they are picky with cam selection but that doesnt make them a bad head. C6 6 speed vette, cam, cai, headers, 495rwhp is pretty good IMO. My G8 just made almost 400 through auto with a ls9 cam (not best NA cam at all) and stock ls3 top end. For a stock head thats fairly cheap they arent bad at all. You cant compare a stock head to a trick flow or any after market casting, I hope the after market heads blows away a stock head, lol.

GreebeanZ28 · 11-13-2013, 06:00 AM

Quote:

Originally Posted by minytrker

You cant compare a stock head to a trick flow or any after market casting, I hope the after market heads blows away a stock head, lol.

Well thats the thing, people are doing just that. Everybody reads about these huge ass, aftermarket like flow numbers the square ports have and then are getting pissed when they cant make the power they supposdly should.

But I agree, theyre good for the money for sure. But is it really worhlth it for me, who already has a cathedral style fast intake, would have to get the heads worked, new springs, pushrods and a new intake and fuel rail rather than just buy a set of trickflows? I havent decided yet lol.

ElecTech · 11-13-2013, 08:48 AM

Quote:

Originally Posted by Pesce Nero

so I just ran the numbers on Dupree's trailblazer. I got over 540hp using his MPH and weight.

who here with Cathedral ports is better than that, just wondering?

Well, this is a little bit of an open ended question, since there are so many variables to making power, but I know Adam's motor is right at 600 crankshaft hp with ported 243's. Now if you are talking, stock, untouched ports and valves, then it wouldn't be a good example.

Pesce Nero · 11-13-2013, 09:37 AM

Quote:

Originally Posted by ElecTech

Well, this is a little bit of an open ended question, since there are so many variables to making power, but I know Adam's motor is right at 600 crankshaft hp with ported 243's. Now if you are talking, stock, untouched ports and valves, then it wouldn't be a good example.

what is Adam's MPH and Weight?

at least 104 at 3300lbs right? if he is lighter than that, which I think is possible, then the MPH would have to be higher

11-12-2013, 09:10 PM	#22
1998ta__1991rs Senior Member Join Date: Jun 2008 Location: West Ash Posts: 4,283	square ports make good power but a cathedral port will run circles around them at the track __________________ Funny

11-12-2013, 09:50 PM	#24
BigdaddyDupree Senior Member Join Date: Jul 2008 Location: MACEDONIA Posts: 4,967	Mine runs good at the track with square ports. __________________ . What you wanna do?

11-12-2013, 10:43 PM	#28
Pesce Nero Senior Member Join Date: Jul 2008 Posts: 2,680	so I just ran the numbers on Dupree's trailblazer. I got over 540hp using his MPH and weight. who here with Cathedral ports is better than that, just wondering? __________________

11-13-2013, 12:00 AM	#32
Pesce Nero Senior Member Join Date: Jul 2008 Posts: 2,680	Not really garbage, but results on anything with less than a 4.060 bore get trashed by cathedral ports. duh Valve shrouding and a big ass chamber seem to be causes. 68cc is a big ass chamber? I was also told that people blow it on cam selection for these heads badly. "Where most guys blow it is not closing the intake valve soon enough. With the air flow the square ports have, and how large the valve is, air speed is very high at low lifts. This doesn't need much valve overlap to help accelerate the charge into the cylinder." not enough compression Guy went on to say that the heads are super picky to cams and the window of valve events to make good power is much smaller in comparison to the cathedral ports. big comp, big cam. little comp, little cam Just what I was told. __________________

11-13-2013, 02:52 AM	#37
minytrker Senior Member Join Date: May 2008 Posts: 1,089	LS3 heads are hard to beat for the money. Like already mentioned they are picky with cam selection but that doesnt make them a bad head. C6 6 speed vette, cam, cai, headers, 495rwhp is pretty good IMO. My G8 just made almost 400 through auto with a ls9 cam (not best NA cam at all) and stock ls3 top end. For a stock head thats fairly cheap they arent bad at all. You cant compare a stock head to a trick flow or any after market casting, I hope the after market heads blows away a stock head, lol. __________________ 1999 Z28 Camaro\|Cut up 2003 CC Duramax Dually\|19.5 w/245/70/19.5\|5in exhaust 2009 G8 GT 408hp/402tq sae\|Rotofab CAI\|LS9 Cam\|Headers\|GXP Mufflers\|Custom System 2009 Tahoe stock

11-12-2013, 10:02 PM	#26
DIGGLER Senior Member Join Date: Aug 2012 Posts: 1,458	$1200 for a brand new set of factory heads that flow 315ish cfm is a pretty kickass deal, imo.