mag pushrod tunnnel clearance ?
#1514905
10/10/13 11:53 AM
10/10/13 11:53 AM
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Posts: 36,040 Lincoln Nebraska
RapidRobert
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LA block/mag heads. I ground the parting line that was about halfway down the tunnel & smoothed out the whole area (pushrod was touching the parting line on mockup). How much clearance do I need between pushrod/wall? thank you for your time.
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Re: mag pushrod tunnnel clearance ?
[Re: 65rbdodge]
#1514908
10/10/13 04:45 PM
10/10/13 04:45 PM
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Posts: 36,040 Lincoln Nebraska
RapidRobert
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It's an early non roller LA block & the heads were some bare new ones I bought a decade ago & I need to find the receipt for them (might be EQ's which are very good). I Used OE MP mag rocker arms/studs/guide plates & adj MP pushrods. EDIT flat tappet cam
Last edited by RapidRobert; 10/10/13 07:31 PM.
live every 24 hour block of time like it's your last day on earth
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Re: mag pushrod tunnnel clearance ?
[Re: RapidRobert]
#1514909
10/10/13 04:50 PM
10/10/13 04:50 PM
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Joined: Jan 2003
Posts: 1,586 Tampa, FL
tpabayflyer
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I used Chevy 1.6 roller rockers on my mag heads and I had to do a bit of grinding on the parting lines and a bit more....... Easy work with a die grinder....... TBF
71 Challenger 528 Hemi project 09 Gr Cherokee 5.7 hemi in da house!!
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Re: mag pushrod tunnnel clearance ?
[Re: tpabayflyer]
#1514910
10/10/13 04:53 PM
10/10/13 04:53 PM
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Joined: Jan 2003
Posts: 1,586 Tampa, FL
tpabayflyer
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I should also mention I was using a non-roller block so the pushrod length was longer and I think this made the problem worse...... Roller lifters and shorter pushrods would help........ TBF
71 Challenger 528 Hemi project 09 Gr Cherokee 5.7 hemi in da house!!
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Re: mag pushrod tunnnel clearance ?
[Re: tpabayflyer]
#1514911
10/10/13 05:00 PM
10/10/13 05:00 PM
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Posts: 36,040 Lincoln Nebraska
RapidRobert
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Yes I was real fortunate to have had those MP adj LA pushrods on hand which were much longer
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Re: mag pushrod tunnnel clearance ?
[Re: Cab_Burge]
#1514913
10/10/13 07:45 PM
10/10/13 07:45 PM
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RapidRobert
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Which if mags were 1.5 I'd be in even worse shape. Cab I think I'll keep grinding till I get the .060" you recommended. The walls are thick so no problem there it's just that I dont like porting so the quicker I get enough clearance the better. Thanks guys!
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Re: mag pushrod tunnnel clearance ?
[Re: 340SHORTY]
#1514915
10/10/13 09:36 PM
10/10/13 09:36 PM
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Posts: 36,040 Lincoln Nebraska
RapidRobert
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These are MP ones meant to be run. I'm assuming that a "checking" pushrod has more adjustment so you can find the correct length needed on any engine but I'm not sure as I ain't never had one in my possession & that extra length may make it unstable but I do not know that to be a fact. I tried to post a pic of the the MP ones I have but my camera setting was too high & this site wont accept it. In my case iirc even the MP fixed length ones for the conversion were too short
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Re: mag pushrod tunnnel clearance ?
[Re: goldmember]
#1514919
10/11/13 11:13 AM
10/11/13 11:13 AM
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Posts: 36,040 Lincoln Nebraska
RapidRobert
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The parting line was substantial & was touching the pushrod so it had to go. With it gone & everything smoothed a bit I do have more than .010" right now
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