Heads - 300cfm.. is it possible?
Thread Starter
11 Second Club
iTrader: (20)
Joined: Jul 2002
Posts: 1,988
Likes: 0
From: Jonesboro, Ga
Heads - 300cfm.. is it possible? A whole group of mustang guys have ganged up against me saying that its impossible for ls1 heads to flow 300cfm on a stock bore. Well, some of these guys even own speed shops down here and say that I have no clue what I'm talking about that they have hands on experience and I am a magazine racer. Lol. Does anybody have any results where they flowed their own heads or had them flowed on an independent bench on a stock bore and did 300cfm or greater?
Thanks,
Josh
Thanks,
Josh
People like that will never really believe it until they see it right in front of them so just pay them no attention. Hell just tell em to look at my site and they will see what can be done with the production valves and MILD porting.
Tony from AFR posted a bunch of flow numbers of several different head porters recently. Do a search and you will find it pretty easy. AFR website even shows flow numbers and are respected by most mustang guys as well and they make some of the best heads for mustangs too. Anyway just some suggestions. There is tons of proof out there and if they don't believe, oh well!
Dan
Dan
Trending Topics
I have had 2 sets flow over 300 on a stock bore at a local shop.
Absolute Speed, and LPE both toped the 300 mark.
AS right at over 300CFM's at 550, 600 and 700.
So tell them to stick with their mustangs, as they dont know a thing about LS1's.
Absolute Speed, and LPE both toped the 300 mark.
AS right at over 300CFM's at 550, 600 and 700.
So tell them to stick with their mustangs, as they dont know a thing about LS1's.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by distortion_69
A whole group of mustang guys have ganged up against me saying that its impossible for ls1 heads to flow 300cfm on a stock bore. Well, some of these guys even own speed shops down here and say that I have no clue what I'm talking about that they have hands on experience and I am a magazine racer. Lol. Does anybody have any results where they flowed their own heads or had them flowed on an independent bench on a stock bore and did 300cfm or greater?
Thanks,
Josh
Thanks,
Josh
to give you a hard time. 
theres numerous shops and independent porters that have surpassed the 300 mark easily Now that I think about it, just agree with them.
Then tell them to be glad the LS1 heads dont flow 300 yet, because if they did the Mustangs would be even further behind. HAHAHA
I bet that shuts them up.
Then tell them to be glad the LS1 heads dont flow 300 yet, because if they did the Mustangs would be even further behind. HAHAHA
I bet that shuts them up.
TECH Enthusiast
Joined: Jan 2004
Posts: 539
Likes: 1
From: Grand Rapids, MI
MARKSZ71 had his 5.3 "truck" heads independantly flowed and they flowed 308@.600
https://ls1tech.com/forums/generation-iii-internal-engine/263891-tsp-stage-2-5-5-3-flows-308-a.html
https://ls1tech.com/forums/generation-iii-internal-engine/263891-tsp-stage-2-5-5-3-flows-308-a.html
TECH Enthusiast
Joined: Jan 2004
Posts: 539
Likes: 1
From: Grand Rapids, MI
Maybe this is why they can't believe it, since patriot is one of the few to offer ported mustang heads check this out.
http://sites.reachtheworld.tv/waterN...05244&DID=1225
Stage II flow 218 cfm @ .600 and the Stage III flows 226 @ .600
Don't stock LS1 heads flow around 235??
http://sites.reachtheworld.tv/waterN...05244&DID=1225
Stage II flow 218 cfm @ .600 and the Stage III flows 226 @ .600
Don't stock LS1 heads flow around 235??
11 & 7 Second Clubs
Joined: Oct 2004
Posts: 1,299
Likes: 0
From: Motorhome, Freeways, Truckstops, Pits
Allan bench flowed my new 205s at 286 cfm but I don't know what they're advertised at.
Originally Posted by distortion_69
A whole group of mustang guys have ganged up against me saying that its impossible for ls1 heads to flow 300cfm on a stock bore. Well, some of these guys even own speed shops down here and say that I have no clue what I'm talking about that they have hands on experience and I am a magazine racer. Lol. Does anybody have any results where they flowed their own heads or had them flowed on an independent bench on a stock bore and did 300cfm or greater?
Thanks,
Josh
Thanks,
Josh
Originally Posted by bickelfirebird
Allan bench flowed my new 205s at 286 cfm but I don't know what they're advertised at.
thats odd cause most numbers are see are 299-305 for those heads
Get some flow numbers of actual heads that could probably be found on here. Show those to them, and then tell em to go back to bolting on $3000 superchargers to 2000 GT's in order to keep up with a bolt on LS1. 
Jason
Jason