General Pushrod/Rocker Theory
11-22-2025 | 05:40 PM
#43
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Joined: Oct 2005
Posts: 266
Likes: 153
From: texas
no
we strayed
methanol injection is actually a wonderful thing,
lowers emissions, boosts power by lowering intake and combustion chamber temps, on engines with DPFs it keeps then cleaner longer avoiding regeneration cycles that USE more fuel
all kinds of good stuff
it also was widely used in ww2 aircraft engines
its cheap ,
now back to boating
we strayed
methanol injection is actually a wonderful thing,
lowers emissions, boosts power by lowering intake and combustion chamber temps, on engines with DPFs it keeps then cleaner longer avoiding regeneration cycles that USE more fuel
all kinds of good stuff
it also was widely used in ww2 aircraft engines
its cheap ,
now back to boating
11-23-2025 | 12:27 AM
#44
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Joined: Sep 2025
Posts: 26
Likes: 6
From: Mississippi
I didn't read through the replies but in the couple hundred I've done invest in a adjustable push rod. You have no control of the sweeping action. You are getting the cam with a lifter on the intake side and place the rocker on the stud and adjust the pushrod until the roller of the rocker is centered on the valve stem face perfectly. Measure your length. Do the same on exhaust. I take an old already compressed head gasket, use the same type, bolt the head in position and install outer valve springs only. Put machinist dye on valve face and roll engine over with the adjustable pushrod in it and then look at where contact points are. The danger is that if it rolls off the valve and depressed the retainer the keepers could fly out and you drop a valve. Buy the highest quality harness steel keepers you can find. I promise you that. I only Comps keepers.
11-23-2025 | 12:39 AM
#45
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Joined: Sep 2025
Posts: 26
Likes: 6
From: Mississippi
With the stud rockers there are only a few economical options for studs here. I don't know why there is such a problem with getting the correct height stud. Nowhere does it say or not that a spacer or precision washed can not be used under the stud when mounting it to the head. The guide plates that I use mount under the stud as well. What is the difference if the tread length is taken from that side of the stud to add contact length or pattern on the rocker side? We are only talking about a tread length or two.There are plenty of places to get spacers and washes to solve the stud height issues for a few dollars.
11-23-2025 | 12:46 AM
#46
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Joined: Sep 2025
Posts: 26
Likes: 6
From: Mississippi
LakeBoat,
That's understandable. I could add .100" spacers under the studs, which would lose me 1.4 base threads, but gain me 2 polylock threads. The base threads of the rocker studs is .750" long (advertised), minus a .050" spacer, minus the guide plate thickness of .087", leaves .613" of base thread engagement. I lose 2/3 of a base thread engagement, but gain a full thread of polylock engagement. Sounds like a reasonable compromise. What says the brain trust?
Thanks. Brad.
That's understandable. I could add .100" spacers under the studs, which would lose me 1.4 base threads, but gain me 2 polylock threads. The base threads of the rocker studs is .750" long (advertised), minus a .050" spacer, minus the guide plate thickness of .087", leaves .613" of base thread engagement. I lose 2/3 of a base thread engagement, but gain a full thread of polylock engagement. Sounds like a reasonable compromise. What says the brain trust?
Thanks. Brad.
