cloneman315
Active member
Has anyone done a comparison on stock vortices and a ported set?
Head flow ported and non ported
- Thread starter cloneman315
- Start date
dgoodhue
BuSTeD 4.3
Re: Head flow ported and non ported
Yes I have. I bought a set of Turbotime street ported heads, E-rue didn't go all out porting this set, it has 2.00/1.60 valves. I flowed them on the same flow bench/same day against a set of stock Vortecs
Stock Vortecs Int/Exh 224/169 cfm
TT Ported Vortecs 240/198
Tooky's stock Vortec number were very similar 227/167, Tooky ported his vortecs with the stock valve and no valve job and the results were minimal gains.
Someone else was selling a set of RPM ported Vortec heads w/2.02/1.60 valves flowed them before selling them a few years ago, his numbers were 245/197. I don't know if that is an typical example of a ported rpm head or not.
Yes I have. I bought a set of Turbotime street ported heads, E-rue didn't go all out porting this set, it has 2.00/1.60 valves. I flowed them on the same flow bench/same day against a set of stock Vortecs
Stock Vortecs Int/Exh 224/169 cfm
TT Ported Vortecs 240/198
Tooky's stock Vortec number were very similar 227/167, Tooky ported his vortecs with the stock valve and no valve job and the results were minimal gains.
Someone else was selling a set of RPM ported Vortec heads w/2.02/1.60 valves flowed them before selling them a few years ago, his numbers were 245/197. I don't know if that is an typical example of a ported rpm head or not.
cloneman315
Active member
Re: Head flow ported and non ported
Any actual hp numbers
Any actual hp numbers
dgoodhue
BuSTeD 4.3
Re: Head flow ported and non ported
Stock vortecs are prettty impressive out of the box compared to L35 and stock LB4 heads. From what I have seen in SBC, you would have to some some special porting to get 260+ cfm out of Vortecs, 250cfm would be doing very well.
IMO While 240-245 cfm seems like a small gain, a 15 cfm gain should worth ~45hp at 15psi if rest of the engine combo will flow that much. Basically if you trying to squeeze every last hp out of the engine ported vortec might be worth $, but if you going for best bang/$ stock vortec will provide that as they flow some like 45% more than the stock heads (L35 flow about 10% more)
Stock vortecs are prettty impressive out of the box compared to L35 and stock LB4 heads. From what I have seen in SBC, you would have to some some special porting to get 260+ cfm out of Vortecs, 250cfm would be doing very well.
IMO While 240-245 cfm seems like a small gain, a 15 cfm gain should worth ~45hp at 15psi if rest of the engine combo will flow that much. Basically if you trying to squeeze every last hp out of the engine ported vortec might be worth $, but if you going for best bang/$ stock vortec will provide that as they flow some like 45% more than the stock heads (L35 flow about 10% more)
dgoodhue
BuSTeD 4.3
Re: Head flow ported and non ported
No. I never installed a set of stock Vortecs. I just had a set laying around, when I had the ported Vortecs off the engine, so I had them flowed.
No. I never installed a set of stock Vortecs. I just had a set laying around, when I had the ported Vortecs off the engine, so I had them flowed.
cloneman315
Active member
Re: Head flow ported and non ported
I am trying to figure out why my mph 1/4 and 1/8 is a bit low,think it might be tq slip,I never did anything with it,this converter was built for my motor when it was stock with the pte52 only
I am trying to figure out why my mph 1/4 and 1/8 is a bit low,think it might be tq slip,I never did anything with it,this converter was built for my motor when it was stock with the pte52 only
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WyoSyclone
Active member
Re: Head flow ported and non ported
I'm sure you've seen the Stan Weiss info here Brian.. http://users.erols.com/srweiss/tablehdc.htm#Chevy
He has stock against ported Vortecs.
Click on the big block chev link, then page up a few pages and you'll be in the SyTy area.
I'm sure you've seen the Stan Weiss info here Brian.. http://users.erols.com/srweiss/tablehdc.htm#Chevy
He has stock against ported Vortecs.
Click on the big block chev link, then page up a few pages and you'll be in the SyTy area.
It's just a six
Super Member
Re: Head flow ported and non ported
IIRC, McCoy used to claim 280 CFM on there heads? Problem is if you do get close to flowing 280 CFM on Vortecs, they are so thin it would not be practicle to use for a street engine.
My Friend had to repair a set of McCoy heads because they had broken through the intake port walls & epoxied them back up. IIRC, they did not flow 280 CFM & the owner of the heads was told they flowed 280 CFM. The really bad head had to be sent out for some cast iron welding.
If you want some heads to flow 280 CFM +, you a re better off getting aftermarket heads like Brodix -8's or -10's etc. Those are ment to flow that much.:2cents:
IIRC, McCoy used to claim 280 CFM on there heads? Problem is if you do get close to flowing 280 CFM on Vortecs, they are so thin it would not be practicle to use for a street engine.
My Friend had to repair a set of McCoy heads because they had broken through the intake port walls & epoxied them back up. IIRC, they did not flow 280 CFM & the owner of the heads was told they flowed 280 CFM. The really bad head had to be sent out for some cast iron welding.
If you want some heads to flow 280 CFM +, you a re better off getting aftermarket heads like Brodix -8's or -10's etc. Those are ment to flow that much.:2cents:
MRKING
New Parts for Old Trucks
Re: Head flow ported and non ported
Cloneman has vortecs already so i dont know the direct reasoning behind this inquiry but the price increase from nonported vortecs to a set of brodix heads is more than the average syty owner can justify . It is easy to see why a low budget vortec swap is so popular around here , they've been proven at speeds/times most would love to be at .
The step up to any aluminum bowtie/brodix/pontiac is great for someone seeking sub 10 second slips but with so many daily driving their trucks , staying away from big money valvetrain and the extra maintenance that come with them surely limits the numbers of who really pulls the trigger on that purchase . These pos's i have now are so trailer queen friendly that i feel like selling the whole setup once i get it back from being built . When he told me I wont push their limits until 10-11k i couldnt help but LOL .
I could cut my travel time up to the Harmon's or down to Gary's house real quick like that :rotf:
Cloneman has vortecs already so i dont know the direct reasoning behind this inquiry but the price increase from nonported vortecs to a set of brodix heads is more than the average syty owner can justify . It is easy to see why a low budget vortec swap is so popular around here , they've been proven at speeds/times most would love to be at .
The step up to any aluminum bowtie/brodix/pontiac is great for someone seeking sub 10 second slips but with so many daily driving their trucks , staying away from big money valvetrain and the extra maintenance that come with them surely limits the numbers of who really pulls the trigger on that purchase . These pos's i have now are so trailer queen friendly that i feel like selling the whole setup once i get it back from being built . When he told me I wont push their limits until 10-11k i couldnt help but LOL .
I could cut my travel time up to the Harmon's or down to Gary's house real quick like that :rotf:
cloneman315
Active member
Re: Head flow ported and non ported
What I am trying to figure out here is my mph,Me and phill longs trucks were just about the same truck,same tune,same dyno etc etc,the only difference was his heads were ported.He was always about 4 to 5 mph faster in the eighth or the quarter,I am starting to think it might be in my converter,I am going to do some runs this week and get a bunch of logs and see what I can determine.I am hoping a fluid upgrade I just did helps the slip
What I am trying to figure out here is my mph,Me and phill longs trucks were just about the same truck,same tune,same dyno etc etc,the only difference was his heads were ported.He was always about 4 to 5 mph faster in the eighth or the quarter,I am starting to think it might be in my converter,I am going to do some runs this week and get a bunch of logs and see what I can determine.I am hoping a fluid upgrade I just did helps the slip
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cloneman315
Active member
Re: Head flow ported and non ported
Was 22 to 25 ,need to look for my old 1/4 slips ,but I would think my eighth mile speed should be 103 to 104 or so.
Was 22 to 25 ,need to look for my old 1/4 slips ,but I would think my eighth mile speed should be 103 to 104 or so.
cloneman315
Active member
Re: Head flow ported and non ported
OnLy ran the 1/4 once on 22psi on street tires it was 10.90 at 124 I think,it was a while ago
OnLy ran the 1/4 once on 22psi on street tires it was 10.90 at 124 I think,it was a while ago
dgoodhue
BuSTeD 4.3
Re: Head flow ported and non ported
I would guess the run in your sig is probably closer to 10.6, you Sy is definitely hooking and moving with what you have now.
If remember correctly Phil Long had a custom cam with the ported Vortecs. He obviously set the bar pretty high. I would guess even with same cam and ported heads that you would not run 103/133mph like he did without really refining the tune.
Below is just my opinion My intuition tells me you probably have a little more mph in your combo. I don't do if that is in the tune or perhaps in your torque converter. I don't what your current mph is in the 1/4 mile but If it was me I would NOT be disappointed with 127-8mph ish on good air night.
I would guess the run in your sig is probably closer to 10.6, you Sy is definitely hooking and moving with what you have now.
If remember correctly Phil Long had a custom cam with the ported Vortecs. He obviously set the bar pretty high. I would guess even with same cam and ported heads that you would not run 103/133mph like he did without really refining the tune.
Below is just my opinion My intuition tells me you probably have a little more mph in your combo. I don't do if that is in the tune or perhaps in your torque converter. I don't what your current mph is in the 1/4 mile but If it was me I would NOT be disappointed with 127-8mph ish on good air night.
cloneman315
Active member
Re: Head flow ported and non ported
Dave
Phill had a 415 , my truck and his truck etc was just about dead on the same,including the dyno and tuner,I have not ran the 1/4 since the 10.9 but I would agree mid 10s now is probably were it's at.that's why I am suspecting the tc slip issue,phill had ported vortices and coil overs also,I am happy with it for sure,just trying to figure out the last little bit left in her.he phill made 40 more whp than me
Dave
Phill had a 415 , my truck and his truck etc was just about dead on the same,including the dyno and tuner,I have not ran the 1/4 since the 10.9 but I would agree mid 10s now is probably were it's at.that's why I am suspecting the tc slip issue,phill had ported vortices and coil overs also,I am happy with it for sure,just trying to figure out the last little bit left in her.he phill made 40 more whp than me
cloneman315
Active member
Re: Head flow ported and non ported
Dave,that's what we are thinking.....And it's def not the 60ft,that's one thing this truck has always done well.
Dave,that's what we are thinking.....And it's def not the 60ft,that's one thing this truck has always done well.
Typhoonracer
Old Guard GURU
Re: Head flow ported and non ported
Coleman,
Are you locking your converter up?
I had a manual switch to lock mine and locked it at about 50 mph.
I will have to look up the pin out for the diag plug....
Coleman,
Are you locking your converter up?
I had a manual switch to lock mine and locked it at about 50 mph.
I will have to look up the pin out for the diag plug....