OPINION ON A SET OF HEADS. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

1JEWLDSSRS · 03-17-2021, 07:06 PM

OK guys, I think I am ready to pull the trigger and do the last item on my build that I have been contemplating for a while. Going to do a set of heads finally and am not sure which would be better for me. I am looking at the PRC 260's that TSP offers, or these from FED. Frankenstein/RK Speed Monster Heads
$2,750.00 FED .700" Dual Springs w/Ti Retainers,

Opinions, pros and cons, and what are you "big" guys using. As always, thanks for your help.

gunchamp · 03-18-2021, 05:29 AM

Sorry, i dont hage input on either one of those, but i will say the GPI heads i have on my car are a work of art and they flow! Only issue is they are LS7 style heads

Ashen 6.2 · 03-18-2021, 05:50 AM

Those FED heads look amazing! Unfortunately, I don't have any useful feedback either.

larry_g · 03-18-2021, 06:18 AM

I don't have anything to offer on those heads but I will tell you questions to ask. With the change in valve angle, how does it affect the rocker options available? The heads I have required different rocker rails due to spacing. However, I didn't like how the stock LS3 rockers (with trunion upgrade) contacted the tips of the valves. That spacing limited my options for fixed spacing rocker setups or finding an adjustable spacing setup. Either way, none of them are inexpensive.

Sent from my Pixel 5 using Tapatalk

eLeSthree · 03-18-2021, 07:02 AM

The M311s come with billet rocker stands and work with stock rockers. They are sexy heads for sure. BUT, unless you special order them and wait, you'll have to take them with 73cc chambers. Not a big deal if your plan is FI someday, but you might not want to give up the compression if you stay NA. The PRC come in several chamber sizes, but Im not sure on the wait time.

Why are you shopping for 6 bolt heads? Planning on FI in the future?

1JEWLDSSRS · 03-18-2021, 10:01 AM

Thanks so far guys for the input. I am shopping for heads as the final puzzle piece to complete my build for a 500+ rwhp streetcar, NA'd.. And from what I have read and learned on here, this mod will do it for me since I am already at 475rwhp. The car is a streetcar and will see the track maybe 4 times a year, and I plan to stay NA'd.

Roader · 03-18-2021, 11:17 AM

I havnt used either one but if I was to redo my heads I’d do the gpi ls7 heads. Will you run 93 or e85? I wish I had more compression but with the ss4 I already had to flycut quite a bit before we milled them. I do run e85 95%of the time.

I know you want 500+ but based off your Dyno you posted previously I don’t see it happening unless you change out more parts than use the heads. Did you ever get it Dyno again without the spike?

Tarendor · 03-18-2021, 01:16 PM

I dont have any input on those because I ended up going with GPI heads, I figured if they were good enough for Ryan that they would be good enough for me

They sent me the heads and I swapped my already upgraded valve train into them and sent mine back in to them (they did the valve job on them and the new heads came with the valves taped into place ready for my springs.)

1JEWLDSSRS · 03-18-2021, 03:23 PM

Thanks again gentlemen. I appreciate it.

Scott S · 03-18-2021, 04:26 PM

Why not just port and polish your heads. They flow pretty well...

Clarkstar · 03-18-2021, 04:37 PM

Quote:

Originally Posted by Scott S

Why not just port and polish your heads. They flow pretty well...

That's what I thought, but I picked up 73 hp with these heads, a custom grind cam and 102mm tb over heads ported factory castings.

1JEWLDSSRS · 03-18-2021, 06:15 PM

Quote:

Originally Posted by Clarkstar

That's what I thought, but I picked up 73 hp with these heads, a custom grind cam and 102mm tb over heads ported factory castings.

Thanks Clark. Appreciated. Yea they said the only thing I would need to change was my pushrods, the 7.400's would be too short, but everything else I have will be ok.

TheFlyingBananaSS · 03-18-2021, 06:54 PM

Check into the GPI heads. GPI is no joke they have some of the fastest cars.

gunchamp · 03-19-2021, 06:26 AM

Quote:

Originally Posted by TheFlyingBananaSS

Check into the GPI heads. GPI is no joke they have some of the fastest cars.

https://www.camaro5.com/forums/showthread.php?t=568830
Page 1 and 4. Just sayin lol

03-17-2021, 07:06 PM	#1
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,442	OPINION ON A SET OF HEADS. OK guys, I think I am ready to pull the trigger and do the last item on my build that I have been contemplating for a while. Going to do a set of heads finally and am not sure which would be better for me. I am looking at the PRC 260's that TSP offers, or these from FED. Frankenstein/RK Speed Monster Heads $2,750.00 FED .700" Dual Springs w/Ti Retainers, Opinions, pros and cons, and what are you "big" guys using. As always, thanks for your help. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

03-18-2021, 05:29 AM	#2
gunchamp Drives: 15 Camaro SS Join Date: Oct 2018 Location: Mountains of central PA Posts: 1,442	Sorry, i dont hage input on either one of those, but i will say the GPI heads i have on my car are a work of art and they flow! Only issue is they are LS7 style heads __________________ 15 Camaro SS- GPI max top end, ESS Vortech V3 9psi, ID 1050s, ZL1 pump, JMS bap, Long tubes, Corsa extreme, Circle D pro 5C, 391 rear, DSS carbon drive shaft, poly cradle bushings, tuned by Ted Jannetty and much much more

03-18-2021, 05:50 AM	#3
Ashen 6.2 Drives: 2014 Camaro Z/SS Join Date: May 2014 Location: NW Arkansas Posts: 2,000 View My Garage	Those FED heads look amazing! Unfortunately, I don't have any useful feedback either. __________________ 2014 Camaro SS L99, Ashen Grey w/Black Leather - Build thread - http://www.camaro5.com/forums/showthread.php?t=491561 Mods - GPI 416 w/Custom Grind Cam, Ported Heads & Tuned by Ben, Holley Dominator ECU, Mag Heartbeat, ZL1 Fuel Pump & DSX Aux Pump, NW 103 TB, FIC 1650's, Alky Meth, Circle D 3600 Triple Disc, Kooks Headers, Viking Coil Overs & all the BMR Goodies in the rear, Zl1 3.23 Diff, DSS Axles, Gulfcoast Driveshaft, Hendrix Offset Diff Bushings, AFE Solid Subframe Bushings, 875HP/843TQ 5FDP

03-18-2021, 06:18 AM	#4
larry_g Drives: 2014 1SS/1LE Join Date: Nov 2015 Location: Louisville, KY Posts: 826	I don't have anything to offer on those heads but I will tell you questions to ask. With the change in valve angle, how does it affect the rocker options available? The heads I have required different rocker rails due to spacing. However, I didn't like how the stock LS3 rockers (with trunion upgrade) contacted the tips of the valves. That spacing limited my options for fixed spacing rocker setups or finding an adjustable spacing setup. Either way, none of them are inexpensive. Sent from my Pixel 5 using Tapatalk __________________ 830 WHP 700 WTQ, Whipple 2.9 @ 13lbs Boost, Flex Fuel Tune by Blevins Tuning, LSA SBE, 3.5 GripTec, ATI LS3 Damper, AFR 260cc Mongoose, ARP Studs, Yella Terra Ultralites, Johnson 2110R, BTR PDS Stage 3, Melling 10355, Improved Racing Baffle, ID1050X, DSX Triple Fuel Pump, RotoFab CAI, NW 103mm TB, Stainless Works 1-7/8" LTH to 3" Speed Eng w/ X-pipe to NPP, Powermaster 9509 XS, Detroit Speed Motor Mounts, MGW, Monster LT1-S, ZL1 Calipers, DBA Rotors & Pads, Bilstein B6 Struts & Shocks, BMR 1.25" Drop Springs & Adj Rear Bar, Pegasus Solid Bushings, Z/28 Wheels, other misc parts.

03-18-2021, 07:02 AM	#5
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,904	The M311s come with billet rocker stands and work with stock rockers. They are sexy heads for sure. BUT, unless you special order them and wait, you'll have to take them with 73cc chambers. Not a big deal if your plan is FI someday, but you might not want to give up the compression if you stay NA. The PRC come in several chamber sizes, but Im not sure on the wait time. Why are you shopping for 6 bolt heads? Planning on FI in the future? __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

03-18-2021, 10:01 AM	#6
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,442	Thanks so far guys for the input. I am shopping for heads as the final puzzle piece to complete my build for a 500+ rwhp streetcar, NA'd.. And from what I have read and learned on here, this mod will do it for me since I am already at 475rwhp. The car is a streetcar and will see the track maybe 4 times a year, and I plan to stay NA'd. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

03-18-2021, 11:17 AM	#7
Roader Drives: Camaro Join Date: Oct 2018 Location: Alabama Posts: 673	I havnt used either one but if I was to redo my heads I’d do the gpi ls7 heads. Will you run 93 or e85? I wish I had more compression but with the ss4 I already had to flycut quite a bit before we milled them. I do run e85 95%of the time. I know you want 500+ but based off your Dyno you posted previously I don’t see it happening unless you change out more parts than use the heads. Did you ever get it Dyno again without the spike?

03-18-2021, 01:16 PM	#8
Tarendor Drives: 2012 camaro 2ss rs L99 Join Date: Feb 2017 Location: North Sioux city SD Posts: 446 View My Garage	I dont have any input on those because I ended up going with GPI heads, I figured if they were good enough for Ryan that they would be good enough for me They sent me the heads and I swapped my already upgraded valve train into them and sent mine back in to them (they did the valve job on them and the new heads came with the valves taped into place ready for my springs.) Attached Images __________________ 2012 2SS/RS, L99, no cats/mufflers, Ported intake manifold, fuel rail upgrade, ID1050x injectors, Vmax throttle body, 25% UDP, GPI DOD delete, GPI SS3, GPI cnc heads, GPI – 5/16″ Hardened Pushrods, BTR trunion upgrade, BTR .660 springs, pcv revamp w/dual catch cans, Circle D 3800, full BMR suspension & bushings. ZL1 fuel pump, HPT programmed fpcm. JMS bap, Snow VC-50 methanol setup. custom 4gal methonal tank, vs7875 turbo, FMIC, precision 46mm WG, 50mm BOV, 3bar map, SJM line lock, Innovate SCG-1, Hurst shifter with tap shift mod, ×2 Holley 14" fans Diy E85, Diy auxiliary pump

03-18-2021, 03:23 PM	#9
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,442	Thanks again gentlemen. I appreciate it. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

03-18-2021, 04:26 PM	#10
Scott S Scott S Drives: 2011 Camaro 2SS Join Date: Sep 2018 Location: Minnesota Posts: 156	Why not just port and polish your heads. They flow pretty well... __________________ 769HP/699 Torque LS3 heads ported and polished with BTR Spring kit & Trunion upgrade, LSA supercharger ported by DC Porting, 102MM throttle Body, 2.40 pulley upper pulley, Innovators West 10% Overdrive lower, BTR Stage 3 PDS Blower Cam, Mighty Mouse Catch Can, SMG Flex Fuel kit, SMG Aux Fuel System, FIC 1000 Injectors, MGW Flat Stick Shifter, RPM Stage Vll Transmission, McLeod RXT clutch, ARH 1 7/8 Headers, 3" X-pipe with Borla S-Type mufflers, ZL1 3:23 rear diff and Axles, 1LE suspension. Bmr Bushings in back. TUNING AND SPECIAL ALIGNMENT BY CARL@Twincitiesperformance

03-18-2021, 06:54 PM	#13
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	Check into the GPI heads. GPI is no joke they have some of the fastest cars. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.