454 BBC need help figuring it out - Chevelle Tech
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post #1 of 5 (permalink) Old Nov 9th, 08, 5:05 PM Thread Starter
Andy
 
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454 BBC need help figuring it out

I have a 454 BBC with 2.07/1.72 valves open chamber 118cc with square intake port/ oval exhaust ports casting #10114156

The Block is a Gen. V block and the # is 12550313

I am trying to figure out what rocker ratio is stock on these heads and if the cam is a hydralic roller cam. How can i figure this out. I have looked at the heads and the rockers have nothing on them to tell what ratio they are. If anyone can help if would be greatly appreciated.

Thanks
Andy
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post #2 of 5 (permalink) Old Nov 9th, 08, 8:21 PM
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Mr Bill
 
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Re: 454 BBC need help figuring it out

Big Block stock rocker ratio is 1.7 to 1 Roller lifters is going to depend on what year vehicle it vcame out of. You should be able to look down through the oil drainback area on a big block head and see the tops of the lifters. If they have the "dog bone" retaining plate that keeps them from rotating, then they are rollers. If not, then not

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post #3 of 5 (permalink) Old Nov 10th, 08, 1:04 PM Thread Starter
Andy
 
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Re: 454 BBC need help figuring it out

Thanks
it doesn't have a dog bone pan so it must be a hydralic cam.
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post #4 of 5 (permalink) Old Nov 10th, 08, 1:44 PM
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Rod
 
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Re: 454 BBC need help figuring it out

Quote:
Originally Posted by aparks1271 View Post
Thanks
it doesn't have a dog bone pan so it must be a hydralic cam.
Pan?

Reread Bill's response. He did not reference a "pan". The "dog bone" he refers to goes between each pair of lifters.
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post #5 of 5 (permalink) Old Nov 10th, 08, 7:36 PM
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Re: 454 BBC need help figuring it out

Yeah, but you'd be able to see the "pan" or "spider" that retains the individual dogbones...

He says it's a Gen 5 block. It won't have a roller-cam unless someone put one there. Gen 6 would be a different story.
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