Frankenstein/RK Speed Monster Heads - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

62nalide · 03-03-2021, 09:39 AM

$2,750.00 FED .700" Dual Springs w/Ti Retainers, No wait time (4) sets left

1JEWLDSSRS · 03-04-2021, 08:50 AM

Hello, couple of questions sir, I have been thinking about a set of heads and have heard good things about these. First will these work on my LS3 converted big cammed L99 engine, and if so will my stock rockers and updated bronze trunions and 7.40 pushrods work as well. And second, what valves, springs, retainers,locks, seals and guides are installed in these heads. Like I mentioned I've been looking and these aren't much more than the AFR'S and PRC 260's I have looked at. The reason I'm interested is I have a goal of trying to get to 500rwhp, or a bit more NA'd. Thanks for your info..

Risingson05 · 03-04-2021, 03:50 PM

Do you loose some bottom end with these heads ? If so , would using a thinner head gasket help alleviate that for a better quench and compression bump ? Of course checking ptv clearance

62nalide · 03-05-2021, 08:31 AM

Quote:

Originally Posted by 1JEWLDSSRS

Hello, couple of questions sir, I have been thinking about a set of heads and have heard good things about these. First will these work on my LS3 converted big cammed L99 engine, and if so will my stock rockers and updated bronze trunions and 7.40 pushrods work as well. And second, what valves, springs, retainers,locks, seals and guides are installed in these heads. Like I mentioned I've been looking and these aren't much more than the AFR'S and PRC 260's I have looked at. The reason I'm interested is I have a goal of trying to get to 500rwhp, or a bit more NA'd. Thanks for your info..

These will work on what you have, being an 11* this gives you more PTV clearance for bigger cams. These have our FED severe duty stainless valves on the intake and exhaust. Our FED .700" Dual Springs with Ti Retainers, GM locks, FED seals and Bonze guides. Depending on supporting mods SBE N/A guys are making as low as 480whp to 580whp with supporting valvetrain components. These are build this way but can build a custom set with whatever valves springs etc just a 10 week wait for custom.

62nalide · 03-05-2021, 08:34 AM

Quote:

Originally Posted by Risingson05

Do you loose some bottom end with these heads ? If so , would using a thinner head gasket help alleviate that for a better quench and compression bump ? Of course checking ptv clearance

below 3500rpms on LS3 they loose very little and gain from there. Thinner gasket will help both lowend and topend. If you have gears and a converter you will never feel the lowend loss.

62nalide · 03-05-2021, 08:58 AM

Updated (2) sets left

62nalide · 03-10-2021, 04:57 PM

1 set left

chevy1234 · 03-10-2021, 10:07 PM

Pm sent

62nalide · 03-16-2021, 09:28 AM

4 more in stock

Strick 9 · 03-16-2021, 03:34 PM

How would these work on an LSA ? Stock blower just pulleys .

Also looking to do a supporting cam & injectors ??

62nalide · 03-17-2021, 09:09 AM

Quote:

Originally Posted by Strick 9

How would these work on an LSA ? Stock blower just pulleys .

Also looking to do a supporting cam & injectors ??

They do great for LSA builds. Depending on supporting mods you can expect roughly 40-60whp gains. We have had customer report back 42whp gains on stock cammed ZL1's and 66whp on cars with pulleys 2" headers and a cam. Will make your combination more efficient.

1JEWLDSSRS · 03-17-2021, 06:59 PM

Question that you didn't answer for me on my last post, will my stock rockers with the bronze bushing upgrade and the cromoly 7.400, 3/8" pushrods work with these heads? Just making sure before I pull the trigger, as I hear good talk about these heads on the forum. Thanks.

62nalide · 03-18-2021, 10:22 AM

Quote:

Originally Posted by 1JEWLDSSRS

Question that you didn't answer for me on my last post, will my stock rockers with the bronze bushing upgrade and the cromoly 7.400, 3/8" pushrods work with these heads? Just making sure before I pull the trigger, as I hear good talk about these heads on the forum. Thanks.

I'm sorry I missed your question. Your stock rockers will bolt right on with the billet rocker stands that come with the heads. 7.400 push rods will not work as they are too short. I strongly recommend measuring for pushrod length as they can vary from 8.100-8.350 depending what lifters and gaskets are being used.

1JEWLDSSRS · 03-18-2021, 03:31 PM

Thanks for the info, just what I needed sir. Appreciated..

03-03-2021, 09:39 AM	#1
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	Frankenstein/RK Speed Monster Heads $2,750.00 FED .700" Dual Springs w/Ti Retainers, No wait time (4) sets left __________________ https://frankensteined.net/ Martin@Frankensteined.net

03-04-2021, 08:50 AM	#2
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,417	Hello, couple of questions sir, I have been thinking about a set of heads and have heard good things about these. First will these work on my LS3 converted big cammed L99 engine, and if so will my stock rockers and updated bronze trunions and 7.40 pushrods work as well. And second, what valves, springs, retainers,locks, seals and guides are installed in these heads. Like I mentioned I've been looking and these aren't much more than the AFR'S and PRC 260's I have looked at. The reason I'm interested is I have a goal of trying to get to 500rwhp, or a bit more NA'd. Thanks for your info.. __________________ 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. Last edited by 1JEWLDSSRS; 03-04-2021 at 12:49 PM.

03-05-2021, 08:58 AM	#6
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	Updated (2) sets left __________________ https://frankensteined.net/ Martin@Frankensteined.net

03-10-2021, 04:57 PM	#7
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	1 set left __________________ https://frankensteined.net/ Martin@Frankensteined.net

03-16-2021, 09:28 AM	#9
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	4 more in stock __________________ https://frankensteined.net/ Martin@Frankensteined.net

03-04-2021, 03:50 PM	#3
Risingson05 Drives: 2015 zl1 m6 Join Date: Jan 2020 Location: Alaska Posts: 702	Do you loose some bottom end with these heads ? If so , would using a thinner head gasket help alleviate that for a better quench and compression bump ? Of course checking ptv clearance

03-10-2021, 10:07 PM	#8
chevy1234 Drives: 2015 Chevy Camaro 2SS Green Flash Join Date: Oct 2017 Location: Alberta Posts: 33	Pm sent

03-16-2021, 03:34 PM	#10
Strick 9 Drives: 2015 ZL1 Join Date: Aug 2016 Location: Orland Park, IL Posts: 68	How would these work on an LSA ? Stock blower just pulleys . Also looking to do a supporting cam & injectors ??

03-17-2021, 06:59 PM	#12
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,417	Question that you didn't answer for me on my last post, will my stock rockers with the bronze bushing upgrade and the cromoly 7.400, 3/8" pushrods work with these heads? Just making sure before I pull the trigger, as I hear good talk about these heads on the forum. Thanks. __________________ 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, 03:31 PM	#14
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,417	Thanks for the info, just what I needed sir. Appreciated.. __________________ 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.