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need advice on flat tappet cam for roadracing HEMI #1573688 02/03/14 07:52 PM 02/03/14 07:52 PM
Joined: Aug 2010 Posts: 208 Munich, Bavaria D docford OP enthusiast
docford OP enthusiast D Joined: Aug 2010 Posts: 208 Munich, Bavaria	we found out that the STX21 cam that came with the used HEMI that I bought is worn beyond specs, so a set of new camshaft with lifters is on the line. I'm looking for a cam in the 300� adv.duration and .550 lift at the valve range. Which cam would you recommend ? The lifter bores are .907. Should I stick with standard .903 lifters ? Which solid flat tappet lifters would you recommend ?

Re: need advice on flat tappet cam for roadracing HEMI [Re: docford] #1573689 02/03/14 08:11 PM 02/03/14 08:11 PM
Joined: Jan 2003 Posts: 31,049 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,049 Oregon	Chase Knight from Crane is a member on here so I'm sure he could give you some suggestions. Mike Jones would be another cam grinder to chat with. He probably has a handle on road racing Hemi engines.

Re: need advice on flat tappet cam for roadracing HEMI [Re: docford] #1573690 02/03/14 08:15 PM 02/03/14 08:15 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Quote: we found out that the STX21 cam that came with the used HEMI that I bought is worn beyond specs, so a set of new camshaft with lifters is on the line. I'm looking for a cam in the 300� adv.duration and .550 lift at the valve range. Which cam would you recommend ? The lifter bores are .907. Should I stick with standard .903 lifters ? Which solid flat tappet lifters would you recommend ? What do you mean by " worn beyond specs " What lifters would you use other than what is available? I don't know of any oversize lifters and Chrysler stopped having those available a LONG time ago .

Re: need advice on flat tappet cam for roadracing HEMI [Re: docford] #1573691 02/03/14 08:27 PM 02/03/14 08:27 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	With the lifter bores worn that much I would have them bushed

Re: need advice on flat tappet cam for roadracing HEMI [Re: docford] #1573692 02/03/14 08:52 PM 02/03/14 08:52 PM
Joined: Mar 2008 Posts: 883 Affton MO Q qwkmopardan super stock
qwkmopardan super stock Q Joined: Mar 2008 Posts: 883 Affton MO	Call Jim at Racer Brown and get a new STX-21 or have him regrind your old one. If the lifter bores are .907 you should have them bushed. Racer Brown phone #410-866-7660

Re: need advice on flat tappet cam for roadracing HEMI [Re: MR_P_BODY] #1573693 02/04/14 05:48 PM 02/04/14 05:48 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Quote: With the lifter bores worn that much I would have them bushed , buy your lifters and have the bushings sized for the proper clearance, plus enjoy a little power increase from having the correct lifter to cam geometry .

Re: need advice on flat tappet cam for roadracing HEMI [Re: docford] #1573694 02/04/14 05:58 PM 02/04/14 05:58 PM
Joined: Dec 2003 Posts: 22,696 Bitopia J jcc If you can't dazzle em with diamonds..
jcc If you can't dazzle em with diamonds.. J Joined: Dec 2003 Posts: 22,696 Bitopia	Why not just step up to a roller? Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.

Re: need advice on flat tappet cam for roadracing HEMI [Re: JohnRR] #1573695 02/04/14 06:43 PM 02/04/14 06:43 PM
Joined: Aug 2010 Posts: 208 Munich, Bavaria D docford OP enthusiast
docford OP enthusiast D Joined: Aug 2010 Posts: 208 Munich, Bavaria	Quote: Quote: we found out that the STX21 cam that came with the used HEMI that I bought is worn beyond specs, so a set of new camshaft with lifters is on the line. I'm looking for a cam in the 300� adv.duration and .550 lift at the valve range. Which cam would you recommend ? The lifter bores are .907. Should I stick with standard .903 lifters ? Which solid flat tappet lifters would you recommend ? the exhaust lobe of the #8 cylinder has 0.060" less lift than the others and all lobes are fully shiny accross their whole surface. Lifter bores measure at .907 and lifters are .902, so standard .903 lifters or COMP CAMS .904 lifters should work What do you mean by " worn beyond specs " What lifters would you use other than what is available? I don't know of any oversize lifters and Chrysler stopped having those available a LONG time ago .

Re: need advice on flat tappet cam for roadracing HEMI [Re: jcc] #1573696 02/04/14 06:45 PM 02/04/14 06:45 PM
Joined: Aug 2010 Posts: 208 Munich, Bavaria D docford OP enthusiast
docford OP enthusiast D Joined: Aug 2010 Posts: 208 Munich, Bavaria	Quote: Why not just step up to a roller? because I'd like to rebuild it like it was back in the day

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