dissapointing head flow numbers
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12 Second Club
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From: Raymore, MO
dissapointing head flow numbers I am guessing this is why my dyno numbers were 10-15 rwhp less than I expected. MTI claims the stage 2R (2.055/1.60) flow 320+ @ .600. To compare, I have a friend with home ported 2.02 heads that flowed 298 @ .600
My heads are at Cylinder Head Specialtys out in Kansas right now. Chris is taking care of the bent valves I had, which by the way MTI sent me 2.02 valves
even when I told them I needed 2.055 valves.
What do you guys think?
Intake Exhaust
.100 66.1 55.0
.200 138.7 103.2
.300 202.8 144.1
.400 258.3 183.8
.500 284.8 188.5
.550 295.2 195.7
.600 297.2 202.4
My heads are at Cylinder Head Specialtys out in Kansas right now. Chris is taking care of the bent valves I had, which by the way MTI sent me 2.02 valves
even when I told them I needed 2.055 valves.What do you guys think?
Intake Exhaust
.100 66.1 55.0
.200 138.7 103.2
.300 202.8 144.1
.400 258.3 183.8
.500 284.8 188.5
.550 295.2 195.7
.600 297.2 202.4
Last edited by Derek98z; May 25, 2005 at 02:06 PM.
Those numbers aren't bad, just not great. Hard to say if they compare though since they were most likely flowed on a different bench with a different radiused entry.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
12 Second Club
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From: Raymore, MO
I was under the impression that all calibrated flow benches will be within 1% of each other. I was dissapointed because these heads are going on a 370 or 408 (which ever I build) and was told to expect 320. Maybe MTI inflates their numbers?
do your heads look as good as the pics on their site? the pics they show have had alot of detail to the bowl area around the valve stem .... i thought the pics shown may not be typical of what you get
Originally Posted by Derek98z
I was under the impression that all calibrated flow benches will be within 1% of each other. I was dissapointed because these heads are going on a 370 or 408 (which ever I build) and was told to expect 320. Maybe MTI inflates their numbers?
Seems like you are just upset that it is not what you ordered, but you never know. There are some things on this board that make me wonder and go WTF. Trending Topics
Originally Posted by 00RedWs6
damn, I always expected the Stage2R heads to flow really good. Makes me wonder what mine flow. I dunno much about flow testing though to know if there are any variables that could come into play.
, unless your cam is really big. LS1 Tech Stories
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Thread Starter
12 Second Club
iTrader: (55)
Joined: Jul 2002
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From: Raymore, MO
LS1 castings. 853 I think
Not blaming MTI for bent valves, you must have read that wrong. Blaming them for me picking up the phone, saying "Hi, I have 2R heads and need new 2.055 valves" then them sending me 2.02 valves.
No, mine do not look as good as the pics on their site. I guess, like people and dyno numbers, was expecting the numbers to read higher. That's all.
Not blaming MTI for bent valves, you must have read that wrong. Blaming them for me picking up the phone, saying "Hi, I have 2R heads and need new 2.055 valves" then them sending me 2.02 valves.
No, mine do not look as good as the pics on their site. I guess, like people and dyno numbers, was expecting the numbers to read higher. That's all.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Good point, why don't you talk with David himself. At worse, I bet he would work out a deal with you if indeed they do not flow what is advertised but on their own bench.
Q though, I thought MTI heads all came with a flow sheet?
Q though, I thought MTI heads all came with a flow sheet?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Speek to David and see if you can send him back the heads for inspection and perhaps freshening for a little fee.
there is always a way and from my personal experience, David will work very hard to make as fair for both of you.
there is always a way and from my personal experience, David will work very hard to make as fair for both of you.
Banned
Joined: Mar 2005
Posts: 223
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Originally Posted by Derek98z
I am guessing this is why my dyno numbers were 10-15 rwhp less than I expected. MTI claims the stage 2R (2.055/1.60) flow 320+ @ .600. To compare, I have a friend with home ported 2.02 heads that flowed 298 @ .600
My heads are at Cylinder Head Specialtys out in Kansas right now. Chris is taking care of the bent valves I had, which by the way MTI sent me 2.02 valves even when I told them I needed 2.055 valves.
What do you guys think?
Intake Exhaust
.100 66.1 55.0
.200 138.7 103.2
.300 202.8 144.1
.400 258.3 183.8
.500 284.8 188.5
.550 295.2 195.7
.600 297.2 202.4
My heads are at Cylinder Head Specialtys out in Kansas right now. Chris is taking care of the bent valves I had, which by the way MTI sent me 2.02 valves
even when I told them I needed 2.055 valves.What do you guys think?
Intake Exhaust
.100 66.1 55.0
.200 138.7 103.2
.300 202.8 144.1
.400 258.3 183.8
.500 284.8 188.5
.550 295.2 195.7
.600 297.2 202.4
I've been there....
, and I feel for you. good luck. 
TECH Enthusiast
Joined: Dec 2004
Posts: 576
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From: Chattanooga
Originally Posted by Derek98z
the heads were just freshened 200 miles ago. Maybe I just expected too much. My dyno numbers weren't horrible, just a little low as is the flow numbers.