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Hydraulic Roller Lifter Question for Hemi #822167 10/05/10 10:13 AM 10/05/10 10:13 AM
Joined: Dec 2006 Posts: 388 Southington, Ohio dm69charger OP enthusiast
dm69charger OP enthusiast Joined: Dec 2006 Posts: 388 Southington, Ohio	Will Comp Cams part number 8921-16 hydraulic roller lifter work in a Hemi? I can possible purchase these lifters along with some other internal components for a Hemi and would like to know if they would work. When I use Summit Racing's online sight, they list them for a 426RB but not for the Hemi. I thought I would ask the experts. Link to the lifters: http://www.summitracing.com/parts/CCA-8921-16/

Re: Hydraulic Roller Lifter Question for Hemi [Re: dm69charger] #822168 10/05/10 10:43 AM 10/05/10 10:43 AM
Joined: Jan 2003 Posts: 1,411 Tallmadge, Ohio P Paul_B pro stock
Paul_B pro stock P Joined: Jan 2003 Posts: 1,411 Tallmadge, Ohio	They won't work in a stock block as the hyd. roller lifter is taller and moves the pushrod seat further from the camshaft. This changes the angle of the pushrod and causes an interference with the block and pushrods. You can clearance the block to run a hyd. roller cam, but it will require a lot of grinding. I'm running one in my 528 hemi and love it.

Re: Hydraulic Roller Lifter Question for Hemi [Re: Paul_B] #822169 10/05/10 01:15 PM 10/05/10 01:15 PM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	Quote: They won't work in a stock block as the hyd. roller lifter is taller and moves the pushrod seat further from the camshaft. This changes the angle of the pushrod and causes an interference with the block and pushrods. You can clearance the block to run a hyd. roller cam, but it will require a lot of grinding. I'm running one in my 528 hemi and love it. Pushrod passages in the head also need to be clearanced.

Re: Hydraulic Roller Lifter Question for Hemi [Re: torkrules] #822170 10/05/10 03:19 PM 10/05/10 03:19 PM
Joined: Dec 2006 Posts: 388 Southington, Ohio dm69charger OP enthusiast
dm69charger OP enthusiast Joined: Dec 2006 Posts: 388 Southington, Ohio	Thanks guys!!! The block is a siamesed bored cast iron block manufactured before 2008. It has not been to the machine shop yet. The heads are Indy 426-1 Legend heads. Would both of these need machining as described to be able to use the roller lifters mentioned above?

Re: Hydraulic Roller Lifter Question for Hemi [Re: dm69charger] #822171 10/05/10 05:10 PM 10/05/10 05:10 PM
Joined: Sep 2009 Posts: 1,805 ky hills thehemikid top fuel
thehemikid top fuel Joined: Sep 2009 Posts: 1,805 ky hills	...I "think" that the tunnel in the block that the push rod goes through would end up (after grinding) to be just a groove, unless "maybe" you was to go to 5/16 heavy wall P-rod. My block was dummy'd up with those Comp Hyd rollers and that was the conclusion. I wanted a Hydrolic roller, but not that bad.

Re: Hydraulic Roller Lifter Question for Hemi [Re: thehemikid] #822172 10/05/10 06:14 PM 10/05/10 06:14 PM
Joined: Jan 2005 Posts: 1,466 malvern, ohio 3 3ddart pro stock
3ddart pro stock 3 Joined: Jan 2005 Posts: 1,466 malvern, ohio	on my hemi, the head tunnels for the pushrods required most of the work, just a little grinding of the block, but i used crane hyd. roller lifters not comps. also had to clearence the mls head gaskets at the pushrod holes i was really glad they were aluminum heads as i did the job myself by hand (although with the problems with the m.p. alum heads going on i'm not sure that was a blessing yet). also my gross lift was .610 and i would think that would determine how much you need to grind. dave

Re: Hydraulic Roller Lifter Question for Hemi [Re: 3ddart] #822173 10/06/10 07:51 AM 10/06/10 07:51 AM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	Quote: on my hemi, the head tunnels for the pushrods required most of the work, just a little grinding of the block, but i used crane hyd. roller lifters not comps. also had to clearence the mls head gaskets at the pushrod holes i was really glad they were aluminum heads as i did the job myself by hand (although with the problems with the m.p. alum heads going on i'm not sure that was a blessing yet). also my gross lift was .610 and i would think that would determine how much you need to grind. dave If you go Cometic head gasket, they do have some that have the pushrod passages already clearanced ("removed"). Check with Tim at FHO. I got a couple of sets from him. You could go solid roller. They are about the same length as a regular lifter and won't alter the angles that much. I can't remember if you already have the cam, but you can get a pretty mild roller made up that won't need crazy spring pressure. Thats what kills the valve train (rollers, rockers, etc.). The only draw back is your need to monitor the clearance now and then.

Re: Hydraulic Roller Lifter Question for Hemi [Re: torkrules] #822174 10/06/10 07:54 AM 10/06/10 07:54 AM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	The only draw back is your need to monitor the clearance now and then. And the bronze oil pump drive and bronze tipped fuel pump push rod (if you use a mechanical pump). Both are consumables (if you keep the cam end play fairly tight and don't have crazy oil pressure, the gear will last a while).

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