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Old 02-18-2009, 04:30 PM
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454 max lift?????????

ok I am wondering, what is the max valve lift for a 454 bbc stock head?

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Old 02-18-2009, 04:49 PM
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There are many different "stock heads" in the Big Block series. Any realistic answer would need a casting no.
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Old 02-18-2009, 05:01 PM
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Would depend on a number of things...such as application or use of engine, compression ratio (piston size), chamber volume, etc. Talking to a cam grinder is always best. Even if you were to buy a complete kit from them, their still going to tell you to measure everything to be safe. It's best not to guess. For general knowledge you could also look up the GM specs. for perform big blocks and get an ideal of the combinations the factory used
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Old 02-18-2009, 09:53 PM
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Some of the big block 70's 80's smogger heads have a valve spring that is very limited to how much lift it will accomodate. .400".
These heads require new valves springs for any kind of a performance cam.
The other issues are guide boss/seal to retainer clearance at full lift.
The stock GM rocker arms also are lift limited too. Thats why there are long slot rockers available. I believe the break point is around .530" lift.
Do not take this as the holly grail.
It is up to you to check and actually measure these critial valvetrain lift clearances when installing a cam with more than stock lift. and make the required changes.
New high perf springs and retainers at minimum should be expected when hopping up a big block cylinder head. Guide bosses may need to be machined shorter for high lift.
Big blocks love lots of valve lift if you want to go fast. .550" lift is nothing for a BBC. So plan on replaceing the stock valve train with hi perf stuff.

What cam are you planning to install?
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Old 02-19-2009, 12:08 AM
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This would be interesting to know for me also. I have 781 heads (November 1977 casting date). Stock everything but I am sure with whatever cam I decide to get that I would lifters springs with it also. I dont understand all this rocker arm ratio and self aligning all that tho stuff tho. Can someone explain that?
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Old 02-19-2009, 12:29 AM
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Self aligning rocker arms have a shoulder on each edge where they contact the valve stem to keep them aligned. When using pushrod guide plates these are not used.
Rocker Info.> http://www.chevytech.com/3c3.html
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Old 02-22-2009, 08:17 PM
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re

sorry computer problems
so the cam im wanting to use has Duration 276/ 286, Lift .500/ .500.
the motor is going into a mud truck and eveything but the intake and carb and headers is stock.
when it comes to the valve train im so so lost lol.
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Old 02-22-2009, 08:19 PM
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re

o and the motor is out of a 92 chevy 3/4ton. if that helps
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Old 02-22-2009, 08:30 PM
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you're probably okay with 500 lift, but for 100.00. you'll probably make more power with aftermarket springs and retainers, about 100.00
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Old 02-22-2009, 08:45 PM
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sweet, so should i get the dubble spring or just the single?
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Old 02-22-2009, 08:48 PM
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springs

competition products, part number vsa7 98.95 plus a little shipping... best deal i've found!
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Old 02-22-2009, 08:52 PM
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awesome, ,

o and also should i worry about valve-piston clearance?
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Old 02-23-2009, 12:16 AM
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Quote:
Originally Posted by redneck_9018
awesome, ,

o and also should i worry about valve-piston clearance?
You'll be fine with the cam you selected.

Ball park for a BBC is any flat tappet bigger than 244@.050 or any roller bigger than 230@.050 should be checked for valve to piston clearance wiht stock or stock type replacement pistons. The custom/racing pistons JE Weisco, Ross etc tend to have deeper valve reliefs than the factory stuff.
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