Stroker crank Rods hitting camshaft? UPDATE
#2341031
07/21/17 04:40 PM
07/21/17 04:40 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
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Bend,OR USA
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I'm building a 572 street Hemi pump gas motor with a 4.500 stroker crank with Chrysler size rod journals and Manley steel rods, the #5&6 and the #3&4 rod are hitting the cam shaft I know now that I should have used the BB Chevy rod journal size but I had the crank and rods so is there a solution? I ran into this on a SB Chevy with stock type Chevy HP Pink rods with a 3 3/4 stroke crankshaft years ago, the solution was to have the roller cam ground on a small base circle core Is that possible on Hemi motors? I found the piston side of the rod where the bolt fits into is hitting the top of the cam lobes now, I will remove all the other rods and pistons to degree the cam and see what comes out
Last edited by Cab_Burge; 07/25/17 02:26 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Stroker crank Rods hitting camshaft?
[Re: Mopar_Rich]
#2341047
07/21/17 05:20 PM
07/21/17 05:20 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
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Bend,OR USA
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I was attempting to degree the cam but it won't rotate enough either way to do that I did run into the cam hitting the rods when I slid it in so I rotated it enough to get it to slide in, I then rotated the crank assembly with all the rods and pistons installed in the block and it didn't hit the cam then Once I set it up to TDC and rotated the cam around to install the timing gears and chain with it align for zero cam advance it hit on the #3/4 and #5/6 rods
Last edited by Cab_Burge; 07/21/17 05:21 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Stroker crank Rods hitting camshaft?
[Re: Cab_Burge]
#2341051
07/21/17 05:35 PM
07/21/17 05:35 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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Try degreeing the cam without the rods on then put the rods on(you know where the crank will be on TDC and set the cam up to the degree what you want) then check to see if it clears.. I think you will have to grind the rod clearance
Last edited by MR_P_BODY; 07/21/17 05:36 PM.
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Re: Stroker crank Rods hitting camshaft?
[Re: Mopar_Rich]
#2341077
07/21/17 06:12 PM
07/21/17 06:12 PM
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crabman173
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crabman173
Unregistered
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I would degree the cam with only #1 rod and piston installed. That will tell you if you really have an issue. I have seen five degrees have a huge affect effect with a solid roller. Personally, with a solid roller and a stock cam location I always do #1 by itself. Yep--5 degrees and she runs or hits--can really make a big diff--do that and it might clear up FWIW I use a copper wire about .050 as the feeler guage--easy to bend around and check where you can't see so well the very first 572 I ever did / same way / degreed cam and Viola! no issues
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Re: Stroker crank Rods hitting camshaft?
[Re: FastmOp]
#2341094
07/21/17 06:44 PM
07/21/17 06:44 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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WOW been there done that. 572 (4.50 bore 4.50 crank)
When I went to order my Callias crank from Dan at Performance Only racing he tried talking me into going with a Chevy size rod journal. I didn't because I already had a set of high dollar Crower steel rods in Mopar size that I wanted to use. Like you I assembled it and went to slowly turn it over and BAM, rod bolt hit the cam. I tried three other cams I had sitting here with zero luck. I tore the short block down and bought a set of K1 rods and had the assembly rebalanced and all was well. The old style rod bolts wouldn't clear but the new cap bolts did. This Spring I had the crank cut to Chevy size and changed up to a nitrous friendly combo with aluminum rods. Everything clears great now too and hopefully will hit the track in my small tire car.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Stroker crank Rods hitting camshaft?
[Re: Cab_Burge]
#2341371
07/22/17 09:30 AM
07/22/17 09:30 AM
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Joined: Jan 2003
Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Frostbitefalls MN (Rocky&Bullw...
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The only issue with grinding the rod bolts IMHO would be leaving enough material so the bolt doesn't lose enough material to weaken it.
Last edited by gregsdart; 07/26/17 04:13 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Stroker crank Rods hitting camshaft?
[Re: gregsdart]
#2341415
07/22/17 12:00 PM
07/22/17 12:00 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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Ya lets just grind the crap out of our rods or rod bolts instead of fixing it right. LOL. Some guys should leave the engine building to more experienced engine builders.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Stroker crank Rods hitting camshaft?
[Re: pittsburghracer]
#2341589
07/22/17 06:49 PM
07/22/17 06:49 PM
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Joined: Jan 2003
Posts: 5,762 Hot Rod Ridge
FastmOp
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master
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Hot Rod Ridge
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Ya lets just grind the crap out of our rods or rod bolts instead of fixing it right. LOL. Some guys should leave the engine building to more experienced engine builders. It's pretty common practice on big motors. It's the head of the bolt most of the time. You can take some off the lobe as well so you can minimize the total off each part.
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Re: Stroker crank Rods hitting camshaft?
[Re: dthemi]
#2341725
07/22/17 11:09 PM
07/22/17 11:09 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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I love it when a shade-tree mechanic (ME) takes the extra time and a little more money sometimes to do it right instead of a "hack job". LOL I could maybe see if there wasn't a choice but in most cases there is. Grind on grinders. I'm out.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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