cam hitting rods......

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Nov 14, 2007 | 09:40 PM

thebufenator

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cam hitting rods......

I just installed my cam into my 383 shortblock, and the lobes are hitting the rods.......
does this mean the cam is too big?

what are my options?

I am new to this.....

Nov 14, 2007 | 09:43 PM

Stl94LT1

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From: O'Fallon, MO

You need a small base-circle camshaft to work with your rotating assembly.

Nov 14, 2007 | 09:44 PM

mdacton

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what rods?

sometimes you can grind the rod a little. If not then go to the small base cam

Nov 14, 2007 | 09:46 PM

thebufenator

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I am using the stock 5.7" rods....it seems to be tapping where the rod bolt is

Nov 14, 2007 | 09:47 PM

mdacton

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Quote:

Originally Posted by thebufenator

I am using the stock 5.7" rods....it seems to be tapping where the rod bolt is

how much....try to grind the top of the bolt a little at a time, it may work it may not

Nov 14, 2007 | 09:58 PM

1racerdude

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Quote:

Originally Posted by Stl94LT1

You need a small base-circle camshaft to work with your rotating assembly.

Nov 14, 2007 | 09:59 PM

thebufenator

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it may only be one rod bolt.......I'll have to check.....

Nov 14, 2007 | 10:06 PM

1racerdude

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They usually hit on more than one rod.
Do a Google I think 2-7 are 2 of them.

Nov 14, 2007 | 10:14 PM

thebufenator

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what exaclty is a small base circle cam?
how does it differ?

Nov 14, 2007 | 10:43 PM

#10

1racerdude

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The cam is physically smaller. This gives the rods enough room to swing.
A .900-.950 base circle should be plenty.

Nov 14, 2007 | 10:45 PM

#11

thebufenator

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wont that effect the geometry of the valvetrain?

Nov 14, 2007 | 10:56 PM

#12

1racerdude

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NO/yes
Spects are the same on the cam, Ya will have to get longer push rods which ya probably were going to need some new ones anyway.

Nov 14, 2007 | 11:43 PM

#13

Wild1

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Silly question. Did you double check your cam timing during the install?

Nov 14, 2007 | 11:48 PM

#14

1racerdude

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Quote:

Originally Posted by Wild1

Silly question. Did you double check your cam timing during the install?

Doesent matter.

383+standard base cam = crash.

Nov 15, 2007 | 07:52 AM

#15

RicocheT

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From: Montpelier, VA USA

Quote:

Originally Posted by mdacton

how much....try to grind the top of the bolt a little at a time, it may work it may not

this will work

i think it hits on 2 4 5 and 7 ... But you should check all to be sure. Doesn't take much grinding for it to clear. make sure you have about .050 clearance.

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