Ultimate G5X3/AFR 205 thread...I have a TON of ?'s...HELP!
08-25-2005, 03:53 AM
#1
Ultimate G5X3/AFR 205 thread...I have a TON of ?'s...HELP! I am running a G5X3 cam kit. I just purchased a set of AFR 205 heads. 
(66 cc, 2.02/1.60 valves) I was told by LG Motorsports that I can install these heads (unmilled)with no piston to valve clearance problems. I know it will be very close though. My friend and I were contemplating on milling these heads, and flycutting the pistons. We were looking to get a higher compression ratio out of this combo, and make some more power.
My questions are........
1. How much should I mill them? (Id like a CR in the 11's.)
2. How much should I flycut the pistons?
3. Which size head gasket would be the right one for me to use in order to do this? (Any brand preferences?)
4. If I mill the heads, will I need different than stock length pushrods? (What size?)
5. Will the springs that come with the AFR's be able to handle the G5X3? (Which kind do they use?)
6. Would you buy head "bolts", or "studs"? Why?
7. What the heck is quench? lol
8. answered
9. Would doing this yeild a worthwhile power gain?
10. Should I buy new lifters? What kind? (Motor has 61K on it)
Anyone who has this combo, please chime in, and tell me what you decided to do. Any help whatsoever, or opinions would be greatly appreciated. Hopefully some of our resident tech gurus will help me out with this. If I forgot to mention any pertinent info you guys might need in order to help me, please let me know.
Thanks in advance for all of the help!
(66 cc, 2.02/1.60 valves) I was told by LG Motorsports that I can install these heads (unmilled)with no piston to valve clearance problems. I know it will be very close though. My friend and I were contemplating on milling these heads, and flycutting the pistons. We were looking to get a higher compression ratio out of this combo, and make some more power. My questions are........
1. How much should I mill them? (Id like a CR in the 11's.)
2. How much should I flycut the pistons?
3. Which size head gasket would be the right one for me to use in order to do this? (Any brand preferences?)
4. If I mill the heads, will I need different than stock length pushrods? (What size?)
5. Will the springs that come with the AFR's be able to handle the G5X3? (Which kind do they use?)
6. Would you buy head "bolts", or "studs"? Why?
7. What the heck is quench? lol
8. answered
9. Would doing this yeild a worthwhile power gain?
10. Should I buy new lifters? What kind? (Motor has 61K on it)
Anyone who has this combo, please chime in, and tell me what you decided to do. Any help whatsoever, or opinions would be greatly appreciated. Hopefully some of our resident tech gurus will help me out with this. If I forgot to mention any pertinent info you guys might need in order to help me, please let me know.
Thanks in advance for all of the help!
Last edited by Nittany_marine; 08-25-2005 at 04:45 AM.
08-25-2005, 07:57 AM
#5
I did a G5X3/AFR install 4 weeks ago for another C5 owner..... you stand to make some serious power
My questions are........
1. How much should I mill them? (Id like a CR in the 11's.)
Milled .024 (62cc chamber) to hit approx 11.05 to 1 (I am assuming .007 out of the hole and .045 head gasket, want higher, mill more)
2. How much should I flycut the pistons?
.080 cut (LG suggest intake only, This is what was suggested when odering the AFRs from LG milled down to 59cc chambers, that is an approx. .042 cut on the heads resulting in 11.5ish to 1 compression. Fly-cutting .080 might be over-kill for .024 milled heads)
3. Which size head gasket would be the right one for me to use in order to do this? (Any brand preferences?)
Assuming you are approx. .007 out of the hole, use a .045 Cometic for an approx .038 quench (and the compression you stated)
4. If I mill the heads, will I need different than stock length pushrods? (What size?)
I am using 7.4s, but if you want it perfect you should do the swip test method to find out exactly what length you need.
5. Will the springs that come with the AFR's be able to handle the G5X3? (Which kind do they use?)
NO those springs will not support that cam, BUT your Patriot Dual golds will
6. Would you buy head "bolts", or "studs"? Why?
I am using ARP studs... Strength and re-use were my reasons
7. What the heck is quench? lol
Quench is the distance between the top of the piston and the quench pad of the head (think about it as the closest point the piston gets to the deck facing surface of the head
8. answered
9. Would doing this yeild a worthwhile power gain?
I would dot every "i" and cross every "t" while you had it apart, hopefully 450+rwhp(sae)
10. Should I buy new lifters? What kind? (Motor has 61K on it)
I would not think so but others may have stronger opinions
Anyone who has this combo, please chime in, and tell me what you decided to do. Any help whatsoever, or opinions would be greatly appreciated. Hopefully some of our resident tech gurus will help me out with this. If I forgot to mention any pertinent info you guys might need in order to help me, please let me know.
Thanks in advance for all of the help!
Originally Posted by Nittany_marine
My questions are........
1. How much should I mill them? (Id like a CR in the 11's.)
Milled .024 (62cc chamber) to hit approx 11.05 to 1 (I am assuming .007 out of the hole and .045 head gasket, want higher, mill more)
2. How much should I flycut the pistons?
.080 cut (LG suggest intake only, This is what was suggested when odering the AFRs from LG milled down to 59cc chambers, that is an approx. .042 cut on the heads resulting in 11.5ish to 1 compression. Fly-cutting .080 might be over-kill for .024 milled heads)
3. Which size head gasket would be the right one for me to use in order to do this? (Any brand preferences?)
Assuming you are approx. .007 out of the hole, use a .045 Cometic for an approx .038 quench (and the compression you stated)
4. If I mill the heads, will I need different than stock length pushrods? (What size?)
I am using 7.4s, but if you want it perfect you should do the swip test method to find out exactly what length you need.
5. Will the springs that come with the AFR's be able to handle the G5X3? (Which kind do they use?)
NO those springs will not support that cam, BUT your Patriot Dual golds will
6. Would you buy head "bolts", or "studs"? Why?
I am using ARP studs... Strength and re-use were my reasons
7. What the heck is quench? lol
Quench is the distance between the top of the piston and the quench pad of the head (think about it as the closest point the piston gets to the deck facing surface of the head
8. answered
9. Would doing this yeild a worthwhile power gain?
I would dot every "i" and cross every "t" while you had it apart, hopefully 450+rwhp(sae)
10. Should I buy new lifters? What kind? (Motor has 61K on it)
I would not think so but others may have stronger opinions
Anyone who has this combo, please chime in, and tell me what you decided to do. Any help whatsoever, or opinions would be greatly appreciated. Hopefully some of our resident tech gurus will help me out with this. If I forgot to mention any pertinent info you guys might need in order to help me, please let me know.
Thanks in advance for all of the help!
Last edited by SideStep; 08-25-2005 at 08:27 AM.
08-25-2005, 08:50 AM
#6
I agree with everything Scott (Side Step) said except the part about the springs. The springs AFR uses in the 205s are the same as Patriot Golds. They're made by the same company for crying out loud...just a different name, LOL. AFR has these springs shimmed from the factory, but you still might want to add some more shims to get the springs to within .050" of coil bind.
__________________
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
08-25-2005, 10:45 AM
#7
Originally Posted by Patrick G
I agree with everything Scott (Side Step) said except the part about the springs. The springs AFR uses in the 205s are the same as Patriot Golds. They're made by the same company for crying out loud...just a different name, LOL. AFR has these springs shimmed from the factory, but you still might want to add some more shims to get the springs to within .050" of coil bind.
Also, I would mill the heads to at least 61 cc's (about .030) to account for the valve reliefs you will be cutting. Assuming 1-2 cc's worth of valve reliefs, you would come in around 11.2-11.25 using a pair of our .040 Cometic gaskets for a tighter quench which I recommend with that set-up. Its not a problem with a stock piston (the tighter quench) as you have minimal piston rock with the tight piston to wall clearance from the factory.
Call me at AFR if you like, but I might be hard to get hold of the next few days (dyno testing the 383 I just finished).
Regards,
Tony
Last edited by Tony Mamo @ AFR; 08-25-2005 at 10:56 AM.
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08-25-2005, 11:27 AM
#8
Originally Posted by Tony Mamo @ AFR
Exactly....they are one and the same purchased from the same manufacturer. We opted not to have the "bling" gold finish. SAME spring in its natural golden brown finish. They would need to be installed at a height of 1.730-1.745 to get the seat pressure where it needs to be to better effectively handle that camshaft.
Also, I would mill the heads to at least 61 cc's (about .030) to account for the valve reliefs you will be cutting. Assuming 1-2 cc's worth of valve reliefs, you would come in around 11.2-11.25 using a pair of our .040 Cometic gaskets for a tighter quench which I recommend with that set-up. Its not a problem with a stock piston (the tighter quench) as you have minimal piston rock with the tight piston to wall clearance from the factory.
Call me at AFR if you like, but I might be hard to get hold of the next few days (dyno testing the 383 I just finished).
Regards,
Tony
Also, I would mill the heads to at least 61 cc's (about .030) to account for the valve reliefs you will be cutting. Assuming 1-2 cc's worth of valve reliefs, you would come in around 11.2-11.25 using a pair of our .040 Cometic gaskets for a tighter quench which I recommend with that set-up. Its not a problem with a stock piston (the tighter quench) as you have minimal piston rock with the tight piston to wall clearance from the factory.
Call me at AFR if you like, but I might be hard to get hold of the next few days (dyno testing the 383 I just finished).
Regards,
Tony
Also, doesanyone know how I install the springs at that height? When I did my 918's with my 224 cam, I just slapped them in. With my PP golds, I had Rapid Motorsports install them. Thanks in advance guys!
08-25-2005, 12:35 PM
#9
Originally Posted by Nittany_marine
I am running a G5X3 cam kit. I just purchased a set of AFR 205 heads. (66 cc, 2.02/1.60 valves) I was told by LG Motorsports that I can install these heads (unmilled)with no piston to valve clearance problems. I know it will be very close though. My friend and I were contemplating on milling these heads, and flycutting the pistons. We were looking to get a higher compression ratio out of this combo, and make some more power.
My questions are........
1. How much should I mill them? (Id like a CR in the 11's.)
2. How much should I flycut the pistons?
3. Which size head gasket would be the right one for me to use in order to do this? (Any brand preferences?)
4. If I mill the heads, will I need different than stock length pushrods? (What size?)
5. Will the springs that come with the AFR's be able to handle the G5X3? (Which kind do they use?)
6. Would you buy head "bolts", or "studs"? Why?
7. What the heck is quench? lol
8. answered
9. Would doing this yeild a worthwhile power gain?
10. Should I buy new lifters? What kind? (Motor has 61K on it)
Anyone who has this combo, please chime in, and tell me what you decided to do. Any help whatsoever, or opinions would be greatly appreciated. Hopefully some of our resident tech gurus will help me out with this. If I forgot to mention any pertinent info you guys might need in order to help me, please let me know.
Thanks in advance for all of the help!
(66 cc, 2.02/1.60 valves) I was told by LG Motorsports that I can install these heads (unmilled)with no piston to valve clearance problems. I know it will be very close though. My friend and I were contemplating on milling these heads, and flycutting the pistons. We were looking to get a higher compression ratio out of this combo, and make some more power. My questions are........
1. How much should I mill them? (Id like a CR in the 11's.)
2. How much should I flycut the pistons?
3. Which size head gasket would be the right one for me to use in order to do this? (Any brand preferences?)
4. If I mill the heads, will I need different than stock length pushrods? (What size?)
5. Will the springs that come with the AFR's be able to handle the G5X3? (Which kind do they use?)
6. Would you buy head "bolts", or "studs"? Why?
7. What the heck is quench? lol
8. answered
9. Would doing this yeild a worthwhile power gain?
10. Should I buy new lifters? What kind? (Motor has 61K on it)
Anyone who has this combo, please chime in, and tell me what you decided to do. Any help whatsoever, or opinions would be greatly appreciated. Hopefully some of our resident tech gurus will help me out with this. If I forgot to mention any pertinent info you guys might need in order to help me, please let me know.
Thanks in advance for all of the help!
my heads were 60cc-61cc and i had 11:1.1.....if i did my math right.
flycut .080 on intake side only.
i used MR gasket LS1 heads gaskets. $20 each and were .041". summit has them.
I used a 7.400" pushrod. i used competition.
not sure what springs they come with. i used patriot gold springs.
i used regular new GM head bolts. $36 for the set from scroggin dickey.
yes you will...well should make awesome power. i made 455rwhp through full exhaust. i used absolute speed stage 2.5 heads flow 314@.600
i used stock low miles lifters. with 61000, it would be a good idea to find a barely used set. or just buy new stock replacement lifters.
my setup worked awesome....no problems at all.
08-25-2005, 12:40 PM
#11
Originally Posted by 30th t/a
make sure you use tr6 plugs. my motor was only able to take 27 degrees timing with the tr55's. i probably would have been over 460 with the tr6s because i would have been able to run more timing.
I will make a note of that. Thanks!
08-25-2005, 11:11 PM
#13
I'd mill to 59cc and cut 80 thou. That puts you around 11.1:1 cuz of the 2cc or so valve relief you're cutting.
That's what LG does, and I've never seen an LG package not make insane power. Also, I'd do the .40" cometics and run the G5X3 on the 114.
Also, Comp 850 OEM Lifters will do the trick if you are worried about that. And if you are worried about the springs at all, LG offers the Comp 921 upgrade on their AFR heads.
That's what LG does, and I've never seen an LG package not make insane power. Also, I'd do the .40" cometics and run the G5X3 on the 114.
Also, Comp 850 OEM Lifters will do the trick if you are worried about that. And if you are worried about the springs at all, LG offers the Comp 921 upgrade on their AFR heads.
08-26-2005, 12:05 AM
#14
Originally Posted by JakeFusion
I'd mill to 59cc and cut 80 thou. That puts you around 11.1:1 cuz of the 2cc or so valve relief you're cutting.
That's what LG does, and I've never seen an LG package not make insane power. Also, I'd do the .40" cometics and run the G5X3 on the 114.
Also, Comp 850 OEM Lifters will do the trick if you are worried about that. And if you are worried about the springs at all, LG offers the Comp 921 upgrade on their AFR heads.
That's what LG does, and I've never seen an LG package not make insane power. Also, I'd do the .40" cometics and run the G5X3 on the 114.
Also, Comp 850 OEM Lifters will do the trick if you are worried about that. And if you are worried about the springs at all, LG offers the Comp 921 upgrade on their AFR heads.
08-26-2005, 12:19 AM
#16
Tony,
With this radical a cam, would a (still unavailable) small chamber 225 head be better?
David
P.S. General
I usually use new lifters with a new cam. However those are solid lifters (currently Comp HTLs) on my stock car's SBC.
With this radical a cam, would a (still unavailable) small chamber 225 head be better?
David
P.S. General
I usually use new lifters with a new cam. However those are solid lifters (currently Comp HTLs) on my stock car's SBC.
08-26-2005, 11:55 AM
#18
Originally Posted by SideStep
I CC'd my .080 fly-cut and it came out to just a hair over 1cc. If you used a .040 Cometic and you are .007 out of the hole you would have approximately 11.5 to 1 compression, assuming you went with the 59cc chamber AFRs...
