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rhs pushrod pinch porting #1333753 11/11/12 06:10 AM 11/11/12 06:10 AM
Joined: Nov 2005 Posts: 248 Sweden T Tobbe OP enthusiast
Tobbe OP enthusiast T Joined: Nov 2005 Posts: 248 Sweden	have a set of rhs magnum heads the have been ported now the shortblock is going to be upgrade to 408cui should i try to go max area around the pushrod area or should i leave it ... the engine have a procharger p-1sc that should have problem feed 400+cui what about sleeving the pushrodhole ,and what about the big "bump" should I try to remove the bolt bump in the channel pics Last edited by Tobbe; 11/11/12 06:16 AM.

Re: rhs pushrod pinch porting [Re: Tobbe] #1333754 11/11/12 07:46 AM 11/11/12 07:46 AM
Joined: Aug 2004 Posts: 2,128 sweden S sshemi top fuel
sshemi top fuel S Joined: Aug 2004 Posts: 2,128 sweden	I dont know what "bump" you mean but if you mean the one for the valvecover bolts then yes remove them. Sleeving is a very good idea. I did mine the same id as la heads witch is 1/2" but you can only fit 5/16" pushrods after that. If you mean the bump for the rocker studs then you dont need to remove them. I have a pair ported for sale to save you some work. Flowes 298 cfm @ 0.512 Aldough they are the La style Last edited by sshemi; 11/11/12 07:47 AM.

Re: rhs pushrod pinch porting [Re: Tobbe] #1333755 11/11/12 01:41 PM 11/11/12 01:41 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: have a set of rhs magnum heads the have been ported now the shortblock is going to be upgrade to 408cui should i try to go max area around the pushrod area or should i leave it ... the engine have a procharger p-1sc that should have problem feed 400+cui what about sleeving the pushrodhole ,and what about the big "bump" should I try to remove the bolt bump in the channel pics Running the same combo as you and decided to just open up the pinch area as much as possible without breaking through the wall ( made a home made set of calipers to measure that area). I felt the added expense of tubing, etc., wasn't worth the gain with those heads. I feel the big intake flow restriction is still at the intake valve, at least with the cam I am running. 7457848-portedironram.jpg (254 downloads) Fastest 300

Re: rhs pushrod pinch porting [Re: Crizila] #1333756 11/11/12 01:46 PM 11/11/12 01:46 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Intake port pinch area prior to final rework and opening up. 7457859-portrunner.jpg (316 downloads) Fastest 300

Re: rhs pushrod pinch porting [Re: Crizila] #1333757 11/11/12 01:53 PM 11/11/12 01:53 PM
Joined: Nov 2005 Posts: 248 Sweden T Tobbe OP enthusiast
Tobbe OP enthusiast T Joined: Nov 2005 Posts: 248 Sweden	my cam would be street/smog friendly aprox 530-550 lift Quote: Quote: have a set of rhs magnum heads the have been ported now the shortblock is going to be upgrade to 408cui should i try to go max area around the pushrod area or should i leave it ... the engine have a procharger p-1sc that should have problem feed 400+cui what about sleeving the pushrodhole ,and what about the big "bump" should I try to remove the bolt bump in the channel pics Running the same combo as you and decided to just open up the pinch area as much as possible without breaking through the wall ( made a home made set of calipers to measure that area). I felt the added expense of tubing, etc., wasn't worth the gain with those heads. I feel the big intake flow restriction is still at the intake valve, at least with the cam I am running. 7457871-DSC_0105.JPG (398 downloads)

Re: rhs pushrod pinch porting [Re: Tobbe] #1333758 11/11/12 03:54 PM 11/11/12 03:54 PM
Joined: Aug 2004 Posts: 2,128 sweden S sshemi top fuel
sshemi top fuel S Joined: Aug 2004 Posts: 2,128 sweden	8 sleeves with interference fit to the heads and 1/2" id cost me about $50. I hammered them in myself.

Re: rhs pushrod pinch porting [Re: sshemi] #1333759 11/11/12 04:16 PM 11/11/12 04:16 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: 8 sleeves with interference fit to the heads and 1/2" id cost me about $50. I hammered them in myself. Wow! Where did you get the sleeves, what was the OD, and how did you go about installing them - reemer size, did you install before opening the port, etc. Price is sure right. Fastest 300

Re: rhs pushrod pinch porting [Re: Crizila] #1333760 11/11/12 04:45 PM 11/11/12 04:45 PM
Joined: Feb 2005 Posts: 20,202 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,202 PA.	Available at my local ace hardware. http://www.ksmetals.com/ 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: rhs pushrod pinch porting [Re: pittsburghracer] #1333761 11/11/12 05:29 PM 11/11/12 05:29 PM
Joined: Aug 2004 Posts: 2,128 sweden S sshemi top fuel
sshemi top fuel S Joined: Aug 2004 Posts: 2,128 sweden	I think i got a friends rebate on them. No reeming at all did the od to fit the id of the p-r holes because the holes are bigger than on a j x or witch ever sb head. And yes did it before any porting. Also i believe that on a sb stroker you need as much cross section area as possible so yes its worth it. An offset rocker with smaller amount of offset than w heads would be great for strokers. Maybe somewhere in the 0,5" area. Read somewhere that mp have some but i dont know anything about them.

Re: rhs pushrod pinch porting [Re: sshemi] #1333762 11/12/12 08:22 PM 11/12/12 08:22 PM
Joined: Oct 2011 Posts: 559 Idaho L LaRoy Engines mopar
LaRoy Engines mopar L Joined: Oct 2011 Posts: 559 Idaho	In 2010 you could buy the LA or Magnum 360X heads with NO pushrod holes at all. Maybe they can still be purchased that-a-way.

Re: rhs pushrod pinch porting [Re: LaRoy Engines] #1333763 11/13/12 01:32 AM 11/13/12 01:32 AM
Joined: Nov 2005 Posts: 248 Sweden T Tobbe OP enthusiast
Tobbe OP enthusiast T Joined: Nov 2005 Posts: 248 Sweden	another set of heads is not an option ... if the gains i small mabey its better to leave them as they are dont whant a fragile head that could leak or crack as i run boost

Re: rhs pushrod pinch porting [Re: Tobbe] #1333764 11/13/12 04:48 AM 11/13/12 04:48 AM
Joined: Mar 2012 Posts: 168 Washington State, USA W Winchester 73 member
Winchester 73 member W Joined: Mar 2012 Posts: 168 Washington State, USA	ive wondered if it would be possible to cut the outer ring of the pushrod hole out and use an offset rocker.fill in the side of the pushrod hole with epoxy and grind untill the pinch is gone. this is hard for me to explain i wish i was computer savy and could post pictures and arrows.

Re: rhs pushrod pinch porting [Re: Winchester 73] #1333765 11/13/12 04:54 AM 11/13/12 04:54 AM
Joined: Nov 2005 Posts: 248 Sweden T Tobbe OP enthusiast
Tobbe OP enthusiast T Joined: Nov 2005 Posts: 248 Sweden	if you have the old la rockersystem i would say ..yes offset rockers would be an option the later magnum have the "chevy" style rockers...

Re: rhs pushrod pinch porting [Re: Winchester 73] #1333766 11/13/12 11:50 AM 11/13/12 11:50 AM
Joined: Feb 2005 Posts: 20,202 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,202 PA.	Quote: ive wondered if it would be possible to cut the outer ring of the pushrod hole out and use an offset rocker.fill in the side of the pushrod hole with epoxy and grind untill the pinch is gone. this is hard for me to explain i wish i was computer savy and could post pictures and arrows. Just keep one thing in the back of your mind. Fast airspeed is bad but slow airspeed is bad also. Each intake port has approximately 3 choke points and its not always the pinch. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: rhs pushrod pinch porting [Re: pittsburghracer] #1333767 11/13/12 12:28 PM 11/13/12 12:28 PM
Joined: Jan 2003 Posts: 9,892 Weddington, N.C. Streetwize master
Streetwize master Joined: Jan 2003 Posts: 9,892 Weddington, N.C.	I'd PM Brian @ IMM (OU812), I believe he knows more about the RHS Mag heads than anyone that I'm aware of. WIZE World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker! https://www.youtube.com/watch?v=-mWzLma3YGI In Car: https://www.youtube.com/watch?v=PjXcf95e6v0

Re: rhs pushrod pinch porting [Re: Streetwize] #1333768 11/13/12 12:35 PM 11/13/12 12:35 PM
Joined: Oct 2011 Posts: 559 Idaho L LaRoy Engines mopar
LaRoy Engines mopar L Joined: Oct 2011 Posts: 559 Idaho	Okay, out with it. The pushrod pinch is not the problem with the 360X head. They will flow over 300cfm with a very minor touch to the pushrod pinch. And the touch best be VERY minor as I have seen the wall thickness there as thin as .025".

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