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Pushrod length?
#646107
03/20/10 01:51 PM
03/20/10 01:51 PM
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Joined: Jan 2004
Posts: 357
The Garden State
LimelightCuda
OP
enthusiast
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OP
enthusiast
Joined: Jan 2004
Posts: 357
The Garden State
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My car has a 440. The engine builder decked the block 0.020" and milled the heads 0.020". I've been told by some people I should get adjustable or custom pushrods and still others have said I can use the factory pushrods. What do you guys think?
If I do need to get shorter pushrods how do I calculate the length needed?
Thanks a lot in advance.
Phil
1970 Barracuda Gran Coupe
1970 A66 Challenger Convertible
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Re: Pushrod length?
[Re: LimelightCuda]
#646108
03/20/10 02:03 PM
03/20/10 02:03 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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More info needed: Stock rebuild/hyd lifters/mild cam?. The machining shortened it .040" but are you going from the oe thin shim gasket to a thicker composition replacement type which will negate some of that. If a stock build/cam/lifters you'll be fine. If not, post what you have
live every 24 hour block of time like it's your last day on earth
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Re: Pushrod length?
[Re: krw71ragtop]
#646110
03/20/10 02:14 PM
03/20/10 02:14 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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KRW are you using Hughes' procedure of getting a straight line (pushrod/rocker) at a certain percentage of lift (w the right length of pushrod) then checking the wipe pattern?
live every 24 hour block of time like it's your last day on earth
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Re: Pushrod length?
[Re: RapidRobert]
#646111
03/20/10 08:04 PM
03/20/10 08:04 PM
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Joined: Nov 2004
Posts: 892
USA
krw71ragtop
super stock
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super stock
Joined: Nov 2004
Posts: 892
USA
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Quote:
KRW are you using Hughes' procedure of getting a straight line (pushrod/rocker) at a certain percentage of lift (w the right length of pushrod) then checking the wipe pattern?
I haven't done the measuring yet but plan to use their supplied instructions. I believe the lift measurement is at .055" on a SB. I briefly read some of the instructions. I'm open to any advice you have. I don't build engines for a living and
I'm trying to retain any good advice. 
I'm building a 410" stroker and the block was decked so pistons are .005" in the hole with, Edelbrock heads milled so chambers are 60 cc's, stage 2 ported by Ryanj, Hughes Engines roller rockers, shafts, hold downs, shims, and spacers, Milodon gear drive timing set. Comp cam 20-231-4 So I thought it would be a good idea to measure PR length.
This would not be possible without the technical support I'm getting from a friend (ex-Chrysler mechanic) who also owns an electronics store, and all the great advice I've had from a big list of moparts members.  I plan on listing the build here on moparts with all the details from pan to carb. after the dyno is done. I'm hoping for 500 hp on this one. 
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Re: Pushrod length?
[Re: krw71ragtop]
#646113
03/20/10 09:53 PM
03/20/10 09:53 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'm certainly not a cam/valvetrain guru so I (at the moment) like Hughes' info which is w one or two threads showing then get the right length push rod for a straight line at the given percentage then check the wipe pattern w the wipe pattern being the most important along w no contact anywhere and the straightness can be compromised to get an acceptable wipe pattern. Length and shims/milling the saddles interact w each other to affect the outcome & I'm a firm believer in mocking the eng up from head to toe & getting every fitment dead on before a teardown for final scrubbing/assembly. If you come up w more info give me a shout as I'm learning on this
live every 24 hour block of time like it's your last day on earth
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Re: Pushrod length?
[Re: RapidRobert]
#646114
03/20/10 11:33 PM
03/20/10 11:33 PM
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Joined: Nov 2004
Posts: 892
USA
krw71ragtop
super stock
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super stock
Joined: Nov 2004
Posts: 892
USA
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Quote:
I'm certainly not a cam/valvetrain guru so I (at the moment) like Hughes' info which is w one or two threads showing then get the right length push rod for a straight line at the given percentage then check the wipe pattern w the wipe pattern being the most important along w no contact anywhere and the straightness can be compromised to get an acceptable wipe pattern. Length and shims/milling the saddles interact w each other to affect the outcome & I'm a firm believer in mocking the eng up from head to toe & getting every fitment dead on before a teardown for final scrubbing/assembly. If you come up w more info give me a shout as I'm learning on this
 I will post all info on my pushrod measurements, mockup, and my complete build asap.
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Re: Pushrod length?
[Re: RapidRobert]
#646116
03/21/10 08:30 AM
03/21/10 08:30 AM
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Joined: Jan 2004
Posts: 357
The Garden State
LimelightCuda
OP
enthusiast
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OP
enthusiast
Joined: Jan 2004
Posts: 357
The Garden State
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Quote:
More info needed: Stock rebuild/hyd lifters/mild cam?. The machining shortened it .040" but are you going from the oe thin shim gasket to a thicker composition replacement type which will negate some of that. If a stock build/cam/lifters you'll be fine. If not, post what you have
The engine has a hydraulic cam and lifters. The cam is slightly hotter than stock. I wanted the car to be drivable so it can be taken to various shows that are far away. It also has/had some pinging problems. I feel this was due to too much area removed from both the heads and block. It was very hard to get the intake manifold on so 2 years ago I took off the heads and had them cut down 0.050" on the intake side so the manifold would bolt on without any trouble which it now does. When I did this I also changed the head gasket to the thickest head gasket I could find although I don't remember the specs on that. The pinging problem definetely improved with the thicker head gasket but it is not completely gone. I plan on tackling that this summer.
I have only driven the car once or twice in the last 20 months due to tranny problems but after thinking about things I remember always hearing the rockers making noise and I tried to adjust them by getting the correct torque on the rocker shaft but this did not help. The fact that the pushrods are too long would explain this problem.
My tranny problems should be resolved in a month and I really want to have this car driveable for the summer. I plan on going to Carlisle and the 'Nats.
Thanks for the good replys. How do I contact Hughes?
Last edited by LimelightCuda; 03/21/10 08:33 AM.
Phil
1970 Barracuda Gran Coupe
1970 A66 Challenger Convertible
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