Re: Reversion what is the impact?
 

Rage,

The Rhodes Lifters are my original installation. I feel I was pushing the reversion limits with the cam I am using, and thought I would try them. I installed them for reversion, and for the chance of a few extra ft./lbs down low. Keep in mind this is a small block 388, so the cam #'s don't directly correlate to your 496.

Mike,

I think your thread has been hijacked :D

This reversion thing is always coming up around here, and I think the more knowledge we share the better.

Re: Reversion what is the impact?
 

.

$$$$ headers or $$$$ blower and no reversion versus a $95 lifter conversion and no reversion.

Re: Reversion what is the impact?
 

Knowledge is sure what I am here for.

Yes the bigger the engine CID the more sensitive to reversion is what I read.

When you brought up the Rhoades lifter option I started another thread just on that to beat the bushes for more people that have tried them and their results. Feel free to jump to "Rhoades lifters eliminate Reversion from hot cams". That aught to attract some views and hopefully good feed back.

Re: Reversion what is the impact?
 

I do not know what Headers are on the 496 but cant the risers be modified in the same manor?

Re: Reversion what is the impact?
 

The 496 do not come with headers. They have an aluminum (Gil) exhaust manifold exiting into a 3" SS collector inside a 4" dia SS water jacket which is rather short. Probably could extend these risers pipes by inserting some 4" and 3" SS pipe but I have the later design corner transum exhaust tips on the Nordic Rage and have to make two 90 degree bends before the transum. This limits the length of possible extension considerably and would probably not have the improvement in reversion desired. I would rather not change the exhaust exit point in transum. So my interest in the lifter option.

Re: Reversion what is the impact?
 

What are your cam #'s? I tried a search on Crane's website with your OEM # but couldn't come up with anything.

If it were me, I would let Rhoads do the change for 95 bones, assuming your cam's # are 'big' You would not have much into it, maybe $250 total when you add gasket costs (assuming your motor is together) and two half days worth of work.

Of course, this would take boating time away

Re: Reversion what is the impact?
 

Mike,

The Crane web site is far from complete I have found. You have to call the Crane Tech line to get the timing card for this cam #. The cam is essentially the EFI500 so not huge but big enough to get me enough reversion to fry the o2 sensors located 1" above the stock exhaust manifold/riser junction. I've spent way more than $95 on o2 sensors already.

Actually the intake manifold and valve cover gaskets are rubber and new with new cam and heads instal this winter/spring so very reusable. The only open question is do I need different push rod length. If I send Rhoades a 496HO lifter they will tell me what if anything I need to do regarding push rod length. I cannot believe how perfect the Rhoades lifters solution seem to me. However I am still looking for some one who had reversion and got rid of it by switching to the Rhoades lifter.

Unfortunately I have run out of project time. I have been on this winter project since November (research phase) and my wife will now shoot me if I do anything other than drive the boat until this next winter. So I am looking toward the future here unless she takes a trip??????

Bill

Re: Reversion what is the impact?
 

The OEM0988 cam timing @0.050 is....
- intake opens 6.0 BTDC
- intake closes 44.0 ABDC
- intake duration 230
- exhaust opens 57.0 BBDC
- exhaust closes (1.0) BTDC
- exhaust duration 236
- LSA114
- Max lift Int 0.598
- Max lift exh 0.610

Re: Reversion what is the impact?
 

This thread branched off to "Rhoades lifters eliminate Reversion from hot cams?"

Re: Reversion what is the impact?
 

Mike,

Your 388, does it have knock sensors? Is it a Mercruiser or GM ECU? I am being told that the ticking noise from the Rhoades lifters closing the valves faster may be missdiagnosed as engine knock by the ECU/knock sensor programing.

Anything on this in your experience?

Bill