434 Camshaft clearance

Old 05-30-2010, 11:55 AM
  #1  
flight71
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Default 434 Camshaft clearance

I thought I had read somewhere that in a stock block you are limited to how much camshaft you can throw at it without hitting the rods even on a small base circle, does anyone know if this is true? What is the limit? Thanks, any info greatly appreciated!
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Old 05-30-2010, 01:04 PM
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zipper06
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It kinda depends on the rods you use and what some cam manufacturers call a small base circle. Some cam grinders call a .930 a small base circle and some call a .900 a small base circle. In most cases you're safe with a .630 to .640 lift. I had bullit grind my cam and it's a .870 base circle, i'm running a .689 lift with a set of Lunati Promod rods, but it's also in a Dart lil "M" block, a stock block has the came cam height.

Zip.
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Old 05-30-2010, 01:34 PM
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flight71
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I have the eagle h-beam 3D stroker rod with L19 bolts, didnt know of the .870 base circle, thanks for the info!
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Old 05-30-2010, 02:04 PM
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ccperf721p
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Duration and separation angle will come into play as well. I've always been fine with .450 lobe lift, but it got a little tight after 278 duration. at 284 / 292 I had to pull .040 from the rods to get what I felt was safe clearance.

Mock it up before the balance work..
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Old 05-30-2010, 02:43 PM
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zipper06
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Originally Posted by ccperf721p
Duration and separation angle will come into play as well. I've always been fine with .450 lobe lift, but it got a little tight after 278 duration. at 284 / 292 I had to pull .040 from the rods to get what I felt was safe clearance.

Mock it up before the balance work..
Yep!
Mine is right in the danger zone, that why i ask them to grind it too an .880 BC which is not standard, but i'd seen the problem before.

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Old 06-01-2010, 08:06 PM
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jmarksdragster
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.850 base circle, and ground a little off the Lunati Pro Mod rods on mine. The wider the LSA, the more issues you will have with clearance.
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Old 06-02-2010, 06:59 AM
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oldandtired
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The number 2 rod is the clearance problem. Just pull it and run a 7 cylinder!
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