PRC 2.5 5.3 vs PRC 215 heads.
07-08-2014, 03:01 PM
#22
You mean you dyno'd 445 on a dyno dynamics dyno and doing the ricer math of adding 10% to supposedly match a dynojet, you would make 490rwhp. 
My old H/C LS1 made 463/414 on a stang dyno. I guess I would be making 510rwhp on a dynojet out of my H/C LS1…....
not happening
Not trying to be rude but your post is misleading.
My old H/C LS1 made 463/414 on a stang dyno. I guess I would be making 510rwhp on a dynojet out of my H/C LS1…....
not happeningNot trying to be rude but your post is misleading.
Last edited by 30th t/a; 07-08-2014 at 03:25 PM.
07-09-2014, 08:24 AM
#23
Skip the 215's. Call TSP and ask them. The 227's are a better head, and pick up substantially from midrange on. Who the hell cares what the car feels like under 2500 anyway. I'm NEVER there.
Get the hollow intake and exhaust valves, good Ti spring kit, and yeah, I'd go with a full on Street Sweeper'ish cam, but get the thing SPEC'D from Ed.
The aftermarket heads are going to give you more than you think, and a hell of a lot better deck surface. Did I mention the 12* valve angle...?
Get the hollow intake and exhaust valves, good Ti spring kit, and yeah, I'd go with a full on Street Sweeper'ish cam, but get the thing SPEC'D from Ed.
The aftermarket heads are going to give you more than you think, and a hell of a lot better deck surface. Did I mention the 12* valve angle...?
07-09-2014, 10:00 AM
#24
Skip the 215's. Call TSP and ask them. The 227's are a better head, and pick up substantially from midrange on. Who the hell cares what the car feels like under 2500 anyway. I'm NEVER there.
Get the hollow intake and exhaust valves, good Ti spring kit, and yeah, I'd go with a full on Street Sweeper'ish cam, but get the thing SPEC'D from Ed.
The aftermarket heads are going to give you more than you think, and a hell of a lot better deck surface. Did I mention the 12* valve angle...?
Get the hollow intake and exhaust valves, good Ti spring kit, and yeah, I'd go with a full on Street Sweeper'ish cam, but get the thing SPEC'D from Ed.
The aftermarket heads are going to give you more than you think, and a hell of a lot better deck surface. Did I mention the 12* valve angle...?
07-09-2014, 12:22 PM
#25
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Skip the 215's. Call TSP and ask them. The 227's are a better head, and pick up substantially from midrange on. Who the hell cares what the car feels like under 2500 anyway. I'm NEVER there.
Get the hollow intake and exhaust valves, good Ti spring kit, and yeah, I'd go with a full on Street Sweeper'ish cam, but get the thing SPEC'D from Ed.
The aftermarket heads are going to give you more than you think, and a hell of a lot better deck surface. Did I mention the 12* valve angle...?
Get the hollow intake and exhaust valves, good Ti spring kit, and yeah, I'd go with a full on Street Sweeper'ish cam, but get the thing SPEC'D from Ed.
The aftermarket heads are going to give you more than you think, and a hell of a lot better deck surface. Did I mention the 12* valve angle...?
07-09-2014, 12:28 PM
#27
Don't buy the anything CNC ported. I would buy the As cast 220 head and have it ported with a valve job done on the head and surfaced milled to ensure they are flat or go with the trickflow as cast 225 and have those ported. You can fit any valve you want in those setups. I would run ferrea hollow stem valves or turned down ls3 valves in the head 2.055 or so and just run a SS exhaust valve. That will make you pick up power everywhere especially with the cam you have now. Your car isn't a race car and will lose more than it gains by going to a bigger cam. Unless you have an automatic with a 4000 stall the cam you have now is great and is regarded as probably one of the best all around cams you can have. Too many people on this board have piece meal setups that don't match and don't work well together and run average times and end up being dyno queens. One other option is a dart 205 head and have that ported to a 225cc or so setup.
Last edited by Always2Slow; 07-09-2014 at 12:39 PM.
07-10-2014, 04:22 PM
#28
11 Second Club
Sorry been busy. My car is completed should be back soon. I then have to put 500 miles break-in on the new rear before she goes back for the dyno tune. ASAP I will make a thread w/ pics & the build list. I will post after dyno results as well.
07-12-2014, 03:51 PM
#30
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How much do you think I would gain with a 10-15 cfm gain across the board? The car is pretty much a weekend toy that goes to the track once or twice a year. I don't know if it's possible but what cam would you suggest to hit the 500 rwhp mark while staying under 6800 rpms and still making decent low and mid range power?
07-12-2014, 03:54 PM
#31
Flow numbers don't always tell the whole tale between two heads. Port shape and speed along with flow is where power is made.
You could possibly see a 25-30hp gain with the right heads. To make 500rwhp a cam will need to peak at 6500-6600rpm which will move the optimal shift point past 7000rpm.
You could possibly see a 25-30hp gain with the right heads. To make 500rwhp a cam will need to peak at 6500-6600rpm which will move the optimal shift point past 7000rpm.
07-12-2014, 04:48 PM
#32
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Flow numbers don't always tell the whole tale between two heads. Port shape and speed along with flow is where power is made.
You could possibly see a 25-30hp gain with the right heads. To make 500rwhp a cam will need to peak at 6500-6600rpm which will move the optimal shift point past 7000rpm.
You could possibly see a 25-30hp gain with the right heads. To make 500rwhp a cam will need to peak at 6500-6600rpm which will move the optimal shift point past 7000rpm.
07-12-2014, 09:42 PM
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I like the 13° valve angle and that they start out at a 62cc combustion chamber better. While I'm not interested in going donkey dick big I'm not opposed to going mid sized on the cam. With having to mill the AFRs to get to 62cc or smaller I may or may not run into p to v issues. And as I originally thought about just swapping the heads the old while I'm in there I might as well train of thought took over lol.
Last edited by mchdg86; 07-12-2014 at 09:51 PM.