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Old 09-08-2010, 10:25 PM
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454 piston to valve clearance?

Im thinking about using this cam (NX279HR) in my 454 with a 177 supercharger with 049 heads and wiseco flattop pistons. Does anyone know if i should have any issues with ptvc? I know that checking is the only way to be sure but i was just curious thanks.

230 int./242 exh
0.537 int./0.541 exh
Lobe separation 113
2,000-6,200 rpm range

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Old 09-08-2010, 10:36 PM
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No living soul has any idea if the block has been decked or if the heads have been cut or if the valve seats have been replaced and sit the valves further toward the piston or what the ACTUAL rocker arm ratio is that you will use (for instance, you buy 1.7 and they ship 1.8) or any other variables involved. So, yeah, check 'em with clay on the pistons and a dial caliper or a dial indicator on the retainer with checking springs.
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Old 09-08-2010, 10:36 PM
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Quote:
Originally Posted by turchiac
Im thinking about using this cam (NX279HR) in my 454 with a 177 supercharger with 049 heads and wiseco flattop pistons. Does anyone know if i should have any issues with ptvc? I know that checking is the only way to be sure but i was just curious thanks.

230 int./242 exh
0.537 int./0.541 exh
Lobe separation 113
2,000-6,200 rpm range
You should be fine- but accept nothing except physical verification.
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Old 09-08-2010, 10:53 PM
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Thanks for the quick responses
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Old 09-09-2010, 04:54 AM
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I will be working on a 496 in the near future.


What should the clearance be typically for a BBC?

1/8" ?
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Old 09-09-2010, 06:21 AM
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Quote:
Originally Posted by 123pugsy
I will be working on a 496 in the near future.


What should the clearance be typically for a BBC?

1/8" ?
1/8" would be more than enough. Typically, 0.080" intake and 0.100" exhaust will be plenty safe. If you use modeling clay, rotate the engine two full revolutions to be sure.
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Old 09-09-2010, 11:53 AM
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The dial indicator seems the easiest way to go.
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Old 09-09-2010, 07:42 PM
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The closest near miss will usually be at the exhaust valve during the overlap period, with the piston chasing the valve back onto its seat.
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