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Tech Talk => Engine Mechanical / Electrical => Topic started by: freshmeat on September 23, 2014, 04:17:51 AM

Title: Need cam for 454 BBC
Post by: freshmeat on September 23, 2014, 04:17:51 AM

I have a stock 454 BBC with a mild cam in my 79 Rebel. I would like to install a more aggressive cam and gain a little more rpm's. What would you guys recommend.

Title: Re: Need cam for 454 BBC
Post by: mash on it on September 23, 2014, 08:59:18 AM

Need more info-
what cam is in it now?
what heads?
what exhaust? intake? comp. ratio?
stock 330 hp truck motor or stock ls-6 450 hp?
what impeller is in the pump?

AND where do you want to go?

go roller, too  :thumbup:
http://www.summitracing.com/parts/hrs-cl120245-10/overview/make/chevrolet (http://www.summitracing.com/parts/hrs-cl120245-10/overview/make/chevrolet)

Dan'l

Title: Re: Need cam for 454 BBC
Post by: freshmeat on September 23, 2014, 01:47:25 PM

I ran the numbers on the block last night and it shows it's a 1978 two bolt main. If I read it rite it's only 215 horse but I'm not sure. I will need to find out about the heads. I do know there oval port and a stock intake. Not sure on compression or cam. Does this sound rite so far?

Title: Re: Need cam for 454 BBC
Post by: mash on it on September 23, 2014, 05:50:22 PM

find the head #'s
probably 781's.
logs and snails?

Title: Re: Need cam for 454 BBC
Post by: freshmeat on September 23, 2014, 07:58:02 PM

Cant find the head numbers they must be under the valve covers and I will have to check them this weekend. The block number is 3999289 and the intake number is 393841. I run both logs and snails and headers.

Title: Re: Need cam for 454 BBC
Post by: chaosmotox on September 23, 2014, 08:12:39 PM

Yes they are located under the valve covers


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Title: Re: Need cam for 454 BBC
Post by: freshmeat on October 02, 2014, 05:43:01 AM

I looked under the valve covers and the last three numbers on the heads are 049, I guess they are the high flow type of oval port heads.

Title: Re: Need cam for 454 BBC
Post by: Squirrel Master on October 02, 2014, 05:57:50 AM

3999289 can also be a vette or chevelle motor what #s are not the front pad

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Title: Re: Need cam for 454 BBC
Post by: freshmeat on October 02, 2014, 06:40:45 AM

Are you saying look on the front pad for numbers? I will go out today and see if I can get more numbers off of it, there kind of hard to read like they did a crappy job of molding them in there.

Title: Re: Need cam for 454 BBC
Post by: 76 Bonneville on October 02, 2014, 07:25:28 AM

Watch your valve clearance. You might have a problem if you just throw a cam in there. Stock pistons may not have a big enough relief in them.

Title: Re: Need cam for 454 BBC
Post by: crewchief22 on October 02, 2014, 07:38:13 PM

Quote from: 76 Bonneville on October 02, 2014, 07:25:28 AM

Watch your valve clearance. You might have a problem if you just throw a cam in there. Stock pistons may not have a big enough relief in them.

^^^^ x2

Stock 049 heads will start to crush valve stem seals at about .570 lift (with 1.7 rockers) unless the bosses are cut down.

Title: Re: Need cam for 454 BBC
Post by: freshmeat on October 02, 2014, 07:40:53 PM

The damn thing runs REAL good the way it is, thinking I'll just leave it alone and add some bling to it. I do have a line on a 427 that I might throw some cash at.

Title: Re: Need cam for 454 BBC
Post by: JBASHAM on October 02, 2014, 08:38:07 PM

Quote from: freshmeat on October 02, 2014, 07:40:53 PM

The damn thing runs REAL good the way it is, thinking I'll just leave it alone and add some bling to it. I do have a line on a 427 that I might throw some cash at.

There's no replacement for displacement.


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Title: Re: Need cam for 454 BBC
Post by: bronco1 on October 04, 2014, 01:18:22 PM

If you are running log and snails you can't get to crazy on cam size but Doug herbert make some really nice cams I have a solid roller cam in my chevy and love the cam

Title: Re: Need cam for 454 BBC
Post by: freshmeat on October 05, 2014, 06:21:57 AM

Decided to just stay with the headers.