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Old 11-20-2004, 04:00 PM   #1 (permalink)
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Push Rod length for a 351M conversion to 400

I am converting my 351M to a 406 stroker motor and I am using the "Aussie" heads for more compression. I am curious if I will need to change the push rods or will I be able to use the stock ones?

I put the engine in and after having to change the distributor due to clearance problems with the stock one I primed the oil pump, stabbed the distributor and fired it up. I let it run for a few minutes and shut it down because I don't see oil in the rockers. When I checked the lash it is big. I think about 3/16" between the rocker and the valve spring when valve is closed. Is this just due to lifters not pumping up or could it be I need longer push rods?

Stuck and don't want to cause too much wear.
Any answers would help.
Thanks
Dave
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Old 11-20-2004, 04:50 PM   #2 (permalink)
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Push Rod length for a 351M conversion to 400

I don't think that the lifters will even compress that far... You need to measure the distance from the closed valve down to the lifter...
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Old 11-20-2004, 04:51 PM   #3 (permalink)
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Push Rod length for a 351M conversion to 400

And keep priming until you get oil everywhere! That's going to help should any mishaps occur.

FE
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Old 11-21-2004, 01:57 AM   #4 (permalink)
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Push Rod length for a 351M conversion to 400

I have checked the oil pressure and at the sending unit I am not getting any pressure. When I pull the sending unit out the oil runs out but not with a lot of pressure just a steady gush of oil out the top of the block. There is still no sign of oil in the rockers. This is a newly rebuilt engine and the first time it has been started. I am thinking it must be the oil pump is no good. Any other ideas???

Dave
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Old 11-22-2004, 12:57 PM   #5 (permalink)
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Push Rod length for a 351M conversion to 400

Definitely check the oil pump, it could be that the screws backed off and you're loosing pressure that way. Use Loc_tite on them. If you're running a drill on an old dist shaft to turn it, it should be really torquey when pumping the oil... I mean you should have to fight to keep your wrist straight.

Keep us up on progress.

FE
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Old 11-22-2004, 06:25 PM   #6 (permalink)
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Push Rod length for a 351M conversion to 400

Well I have been using the drill motor and also a speed handle to prime the pump. It has some drag to it and we are getting a LITTLE pit of oil out the top but no real pressure. I checked with the machinist and he asked me if I put the plugs in that go by the cam. At this point I can't remember but I never took them out so it is hard to remember if they were in the engine kit. I will look tonight to see if there were any left over gaskets or plugs.
Looks like the timing gear and chain are coming off to inspect. RATS! Big old Rats!
Any other ideas? The engine runs good but I need some oil pressure.
Later
Dave
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Old 11-22-2004, 07:28 PM   #7 (permalink)
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Push Rod length for a 351M conversion to 400

It could be that a cam plug got turned sideways and is letting oil pressure out that way. You "must needs" find out b4 hurting your baby! I don't remember any cam plugs coming with a rebuild kit....
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Old 11-22-2004, 07:43 PM   #8 (permalink)
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Push Rod length for a 351M conversion to 400

I don't either but my machinist says they did and I can't remember if I put them in or not. I am usually very thorough about these things.
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Old 11-22-2004, 11:39 PM   #9 (permalink)
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Push Rod length for a 351M conversion to 400

Are you running a solid lifter cam or a hydraulic?? If its a hyd. cam, then there should not be any lash at all, the push rod should always be in contact with the lifter and the rocker arm should also always be in contact with the valve tip.
Oil can escape from between the lifter and pushrod if there is lash or a gap between them. But if you're not getting oil out of the rear oil port while turning it with a drill, then the problem is elsewhere.
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Old 12-16-2009, 09:41 PM   #10 (permalink)
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Re: Push Rod length for a 351M conversion to 400

Quote:
Originally Posted by TorinoStyle View Post
Are you running a solid lifter cam or a hydraulic?? If its a hyd. cam, then there should not be any lash at all, the push rod should always be in contact with the lifter and the rocker arm should also always be in contact with the valve tip.
Oil can escape from between the lifter and pushrod if there is lash or a gap between them. But if you're not getting oil out of the rear oil port while turning it with a drill, then the problem is elsewhere.
I found out it was the cam plugs that were left out and when I put them back in I now have over 60 lbs of oil pressure! YES!!!
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Old 12-16-2009, 11:45 PM   #11 (permalink)
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Re: Push Rod length for a 351M conversion to 400

In response to your original question. We installed CHI heads on our 351C (408). The stock push rods were way off. Since I had never figured out push rod length it was giving me problems. I had purchased an adjustable push rod but was still feeling uneasy. A friend loaned me his gauge he uses on BBC. I used this tool with the adjustable push rod, made sure the lifter was pumped up, placed the tool on the rocker stud until it contacted the valve stem then adjusted the test push rod to just contact the tool. Measured the rod on both intake and exhaust and ordered push rods. They seem to check out just fine and the engine runs well. Even though the tool is for a BBC rockers will interchange so the tool should also interchange.
Here is the tool I used.
Proform Push Rod Length Checker - JEGS
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