383 rod to cam clearance - Team Camaro Tech
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post #1 of 6 (permalink) Old Feb 21st, 10, 05:27 PM Thread Starter
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383 rod to cam clearance

Everything I have ever read about building a 383 talks about checking the clearance of the rod bolts with the cam. I got an Eagle crank kit with their SIR rods to put in a 68 327 block. When I mocked it up, I found the obvious issues with the rod bolts and cylinder walls. But I can't see how to measure for clearance at the cam. There are no contact issues, it spins freely, so I am wondering if I'm missing something, or will it be OK? The cam is Comp cams XE274H, .327 lift, 274/286 (230/236 @ .050) duration, 110 LSA. The rods have capscrews, not the factory style bolts thru the rod shoulder with nuts on the rod cap. Maybe Eagle does it this way so they are already clearanced? Or maybe the mild hydraulic cam is small enough to stay out of harms way?
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post #2 of 6 (permalink) Old Feb 21st, 10, 06:09 PM
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Bill
 
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Re: 383 rod to cam clearance

A,
Most of the cap screw rods have enough room but you really need to check it. I use a piece of .050 thick mechanics wire that is bent at the end and just slowly turn the crank until it looks like it is at the closest spot, then see if I can slide the wire through. I have tried putting a little bit of clay on the rod, but that does not seem to work very good. It is time consuming, but you absolutely have to check it.

Bill Koustenis
Owner
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Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


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post #3 of 6 (permalink) Old Feb 21st, 10, 06:21 PM
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Re: 383 rod to cam clearance

Make sure you have the Sir rods ckecked for size after they have been retorqued as we have seen problems with them before.

A guy brought a rotator in to balance a month and I checked one rod and it was round then broke it down and retorqued it and it showed to be .0015 out of round and he said it would be fine, The engine lasted less then a week.
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post #4 of 6 (permalink) Old Feb 21st, 10, 11:11 PM
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Ron
 
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Re: 383 rod to cam clearance

I sand down the end of a Slip Tie and MIC it. It will slide easily into places such as Piston Skirts to Crank Throws, Rod to Cam, Spring Bind ... etc to determine clearances.

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post #5 of 6 (permalink) Old Feb 21st, 10, 11:20 PM
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Sean
 
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Re: 383 rod to cam clearance

I have used a large paperclip bent to slip in between the rod and cam (almost exactly .050), but the best way I have found is with one rod a time you can slip a valve adjusting type feeler gauge (bent) in there.

Definitely check but I'll be surprised if you have an issue with a cap screw rod and that cam.

Sean

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Repetition does not transform a lie into a truth.

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post #6 of 6 (permalink) Old Feb 22nd, 10, 05:46 PM Thread Starter
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Re: 383 rod to cam clearance

Thanks everybody - all sound like good tips. I used .062 for the rod bolt to block clearance (the diameter of 14 AWG romex - I'm more qualified as an electrician than a mechanic). But it sounds like .050 is enough clearance at the cam?
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clearance, rod bolts, stroker

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