PRC stg 2.5 heads VS. P&P 241
09-29-2008, 02:04 PM
#41
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Heads done by Creative Flow Management. 241 cast with stock valves:
lift in ex
.100 77 65
.200 145 116
.300 199 159
.400 243 190
.500 275 210
.600 285 216
This also included a valve job. The intake had only the bowl and opening worked, the runner was left alone to help velocity. I run a cam close to yours (Vinci XXX 222/228) as well. Numbers in sig.
lift in ex
.100 77 65
.200 145 116
.300 199 159
.400 243 190
.500 275 210
.600 285 216
This also included a valve job. The intake had only the bowl and opening worked, the runner was left alone to help velocity. I run a cam close to yours (Vinci XXX 222/228) as well. Numbers in sig.
09-29-2008, 02:19 PM
#42
In my car A) I couldn't hook well on nittos and B) I have a stock 10 bolt and a stock 150K clutch. I'm basically launching like I would on the street. Changing nothing else engine-wise, a good clutch, M/T's and a 9" out back would get me in the mid 11's. I have a mail order tune right now and I am pretty sure it's far from optimized. I'll probably hit 120 MPH with a good dyno tune. I'll have different heads before that happens, though.
With my heads, the stock valve sizes are 2.00/1.55, but these are Ferrea valves with narrower valve stems and flatter heads, so they flow better.
With my heads, the stock valve sizes are 2.00/1.55, but these are Ferrea valves with narrower valve stems and flatter heads, so they flow better.
11-04-2008, 09:40 PM
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This statement is definately made by someone with very little actual dyno testing. I've engine dyno tested many, many different head combos on LS based engines & having a little bit of runner size is not neccessarily a bad thing. I'd be more than happy to share some dyno comparisons with you guys on small runner 205cc heads, PRC 220cc 5.3l heads & the new PRC 215 aftermarket casting. For the money the PRC 5.3l stage 2.5 heads did very well next to the bigger money aftermarket castings....
You said that you would be more than happy to share some dyno comarisons with us. I would like to see them please. The reason I ask is I have been searching everything I can find on AFR 205/TFS 215/PRC 5.3, stg 2.5 and now this PRC 215 is comming out. I was told by your shop that the AFR 205 was only good for about 8 HP over your PRC 5.3 and dont waste the grand for them. I have found a set of AFR 205's that have been freshend up for 1500 and your 5.3's are only 1200. I have had plenty of shops tell me that the AFR's are worth 15-20 HP over a well done 5.3. So what is the story? I have a D/D 02 LS1 with all of the bolt ons and will be running only a 224/228 cam. Thanking you in advance for any help.
11-04-2008, 09:56 PM
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11-04-2008, 10:00 PM
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Oh ya NO doubt in my mind that AFR's would be better and TFS would be best. Hell there are people out there with smaller cams making more power than I am with AFR heads.
If you can get a nice set of AFR's for 1500 bucks do it and never look back! Why arent you buying them right now???!!!
If you can get a nice set of AFR's for 1500 bucks do it and never look back! Why arent you buying them right now???!!!
11-05-2008, 10:57 AM
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Oh ya NO doubt in my mind that AFR's would be better and TFS would be best. Hell there are people out there with smaller cams making more power than I am with AFR heads.
If you can get a nice set of AFR's for 1500 bucks do it and never look back! Why arent you buying them right now???!!!
If you can get a nice set of AFR's for 1500 bucks do it and never look back! Why arent you buying them right now???!!!
11-05-2008, 12:18 PM
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Jason,
You said that you would be more than happy to share some dyno comarisons with us. I would like to see them please. The reason I ask is I have been searching everything I can find on AFR 205/TFS 215/PRC 5.3, stg 2.5 and now this PRC 215 is comming out. I was told by your shop that the AFR 205 was only good for about 8 HP over your PRC 5.3 and dont waste the grand for them. I have found a set of AFR 205's that have been freshend up for 1500 and your 5.3's are only 1200. I have had plenty of shops tell me that the AFR's are worth 15-20 HP over a well done 5.3. So what is the story? I have a D/D 02 LS1 with all of the bolt ons and will be running only a 224/228 cam. Thanking you in advance for any help.
You said that you would be more than happy to share some dyno comarisons with us. I would like to see them please. The reason I ask is I have been searching everything I can find on AFR 205/TFS 215/PRC 5.3, stg 2.5 and now this PRC 215 is comming out. I was told by your shop that the AFR 205 was only good for about 8 HP over your PRC 5.3 and dont waste the grand for them. I have found a set of AFR 205's that have been freshend up for 1500 and your 5.3's are only 1200. I have had plenty of shops tell me that the AFR's are worth 15-20 HP over a well done 5.3. So what is the story? I have a D/D 02 LS1 with all of the bolt ons and will be running only a 224/228 cam. Thanking you in advance for any help.
11-05-2008, 01:01 PM
#51
There's some back to back engine dyno testing with a 228R camshaft.
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11-05-2008, 03:20 PM
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11-05-2008, 10:18 PM
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I have to say it was a good investment on my part, I sent them to Bret at BRE he said they look better then any TSP or patriot head. The only place it was really lacking was the VJ.
I'll be getting them on thurs first time I'll get to see them since I bought them. lol I was going to get them flowed but bret said he didnt need to know so Im just going to see the hp numbers. They made close to 45 improvement over your cam only. So im happy with that. I'll keep you updated on the set up once I get everything together.
Did you flycut Im debating whether or not to use .40 head gaskets and if its worth the HP?
Eric
I'll be getting them on thurs first time I'll get to see them since I bought them. lol I was going to get them flowed but bret said he didnt need to know so Im just going to see the hp numbers. They made close to 45 improvement over your cam only. So im happy with that. I'll keep you updated on the set up once I get everything together.
Did you flycut Im debating whether or not to use .40 head gaskets and if its worth the HP?
Eric
It's only making about 419 end of this year, on stock unported, unmilled 241s and trapped 122.8 best.
11-07-2008, 10:18 AM
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11-07-2008, 11:45 AM
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11-07-2008, 01:58 PM
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Im not so sure...
Now let me say I LOVE my 5.3's, they are the best budget head out there. Look at my sig for my mods Im making great power with a baby cam.
What Id like to know is the combustion chamber size difference between the 5.3's the 215's and the 205. As far as I know the 5.3's come box stock at 62-63cc, What about the AFR? If both had same size CC's I believe the AFR would do better.
However I could very well be wrong!
Now let me say I LOVE my 5.3's, they are the best budget head out there. Look at my sig for my mods Im making great power with a baby cam.
What Id like to know is the combustion chamber size difference between the 5.3's the 215's and the 205. As far as I know the 5.3's come box stock at 62-63cc, What about the AFR? If both had same size CC's I believe the AFR would do better.
However I could very well be wrong!
11-10-2008, 10:34 AM
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Im not so sure...
Now let me say I LOVE my 5.3's, they are the best budget head out there. Look at my sig for my mods Im making great power with a baby cam.
What Id like to know is the combustion chamber size difference between the 5.3's the 215's and the 205. As far as I know the 5.3's come box stock at 62-63cc, What about the AFR? If both had same size CC's I believe the AFR would do better.
However I could very well be wrong!
Now let me say I LOVE my 5.3's, they are the best budget head out there. Look at my sig for my mods Im making great power with a baby cam.
What Id like to know is the combustion chamber size difference between the 5.3's the 215's and the 205. As far as I know the 5.3's come box stock at 62-63cc, What about the AFR? If both had same size CC's I believe the AFR would do better.
However I could very well be wrong!
11-10-2008, 03:13 PM
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02-19-2009, 11:24 PM
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i find it hard to believe that some ported stock casting 5.3 heads would outperform some AFR 205cc heads that were redesigned from the ground up just to make horsepower. there is something going on with this that doesn't make sense? was compression the same? etc.
can you guys at texas speed verify that this chart shows 5.3 ported heads outperforming AFR 205cc heads??
can you guys at texas speed verify that this chart shows 5.3 ported heads outperforming AFR 205cc heads??