Re: 3/8" pushrods with Stealth heads?
[Re: 68LAR]
#1409912
03/27/13 07:09 PM
03/27/13 07:09 PM
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Joined: Oct 2007
Posts: 288 Birmingham, England
Mick70RR
enthusiast
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enthusiast
Joined: Oct 2007
Posts: 288
Birmingham, England
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I found I could not get 3/8" pushrods to clear the heads with 1.5 ratio rockers. I had to do some filing/grinding to get them to clear. When I fitted 1.6 ratio rockers I went back to 5/16" pushrods so I didn't have to grind them again.
1970 Road Runner
505 cid
MCH CNC ported Stealth heads
MP 528 camshaft
4 speed
GV overdrive
11.98 @ 117 on street treads
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Re: 3/8" pushrods with Stealth heads?
[Re: 68LAR]
#1409917
03/27/13 09:48 PM
03/27/13 09:48 PM
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Joined: Jan 2003
Posts: 6,531 Jacksonville, FL
Chris2581
master
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master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
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I use Crane 3/8th's pushrods and Crane iron 1.5 rockers with my Stealth's. I'm using the Mopar 296/557 cam,and Comp springs and retainers/locks. I had to open the intake pushrod holes a bit,but all I did was mock up the heads,and used a marker where they didn't clear and ground away.Wasn't much,and I maybe had an hour's worth of time doing so.
Nautilus Racing- We use Superformance gaskets and Turbo Action converters/products.
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Re: 3/8" pushrods with Stealth heads?
[Re: 68LAR]
#1409919
03/27/13 10:32 PM
03/27/13 10:32 PM
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Joined: Feb 2007
Posts: 1,025 Las Vegas, NV
dodgeboy11
super stock
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super stock
Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
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Not to be a sarcastic pr!ck, but you need to clearance the part of the head that hits the pushrod. Different rockers, lifter type can all affect where the clearance issues will spring up. My favorite method is to use some blue dykem on the head, install it with a gasket and a few bolts, install the lifters, pushrods and rockers and roll the engine over a few times. This will usually leave a shiny spot on the head where you need to address things. If the interference is bad enough you won't even be able to get the rocker to seat on the pushrod, and if you try to force it, expect a bent pushrod. Hope it all works out well for you.
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Re: 3/8" pushrods with Stealth heads?
[Re: dodgeboy11]
#1409920
03/27/13 10:56 PM
03/27/13 10:56 PM
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Joined: Jan 2003
Posts: 21,073 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,073
Niles , Ohio
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I have a set of the first heads.My 440 rins .588 cam with solids.I run Crane 3/8 alloy rods with Erson iron rockers.Mine just clear.I ran it for a while after the install and rechecked it when I adjusted the valves.Never saw any rubbing.Rocky
Chrysler Firepower
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Re: 3/8" pushrods with Stealth heads?
[Re: 68LAR]
#1409923
03/28/13 09:28 AM
03/28/13 09:28 AM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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A good quality 5/16 .080+ wall pushrod will easily handle 450 lbs open pressure and deflection isn't a problem. If it makes you feel better you can buy them with a thicker wall also. I don't see any reason to make it a bigger project than it should be for a flat tappet or hydraulic roller application. For a aggressive solid roller i'd step up to 3/8 pushrods though.
machine shop owner and engine builder
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