Need Help With BBC 840 Casting Information
 

I have a set of 840 casting and I haven't had a chance as of yet to get them flowed, does anyone here have or know the 840 specs

Flow Numbers
Combustion Chamber size(s)

Thanks for the help

Phil Rowe

Re: Need Help With BBC 840 Casting Information
 

Knowone really knows anything about these heads, Thanks anyway

Re: Need Help With BBC 840 Casting Information
 

According to the tech sheet they are 114.9 cc chambers

Re: Need Help With BBC 840 Casting Information
 

Have you ever heard of your basic search engine,,,,, hint Goggle,,, etc.

Re: Need Help With BBC 840 Casting Information
 

Phil,
The 840 castings are rect. port heads with 2.19 int. and 1.72 exh. valves. They are closed chamber heads at 104.9 cc. Flow #s all depend on what you do with them as far as valve job and port work.

Re: Need Help With BBC 840 Casting Information
 

Ron thanks for the advise but I would hold and trust the word of those from this site that might be using them current or in the past over and above your recommendation. But thanks again for your reply.

Phil

Re: Need Help With BBC 840 Casting Information
 

Jim, thank you very much for your reply! that answers my question. I'm looking at building a pump gas motor and I want all the quench I can get and that combustion chamber will work great for my purpose. By the way I don't trust all those other places that either don't have all the information or its so broad it doesn't answer the question(s)

Thanks again,

phil

Re: Need Help With BBC 840 Casting Information
 

GearJammer, For those running 427/425HP with a cast iron head in Stock & SS you will find that most run either the 840 or 291 head.

Re: Need Help With BBC 840 Casting Information
 

Thank you mannymen, thats what I want to hear. Thanks again for the reply

Phil

Re: Need Help With BBC 840 Casting Information
 

If this is a street pump gas engine, with no rules, you'd be better off to sell those heads to someone who needs them, and buy a set of small chamber Edelbrock aluminum heads.

A 60499 Edelbrock, out of the box, has a 100cc chamber, 2.19 and 1.88 valves, and flows 300 cfm @ 0.600 lift on the intake, and 218cfm @ 0.600 lift on the exhaust, with no work. All new heads and all new parts.

A good shop doing a 3 angle valve job, new guide liners, cleaning, milling, and assembling the 840 heads will charge at least around $500 labor. That's without hardened exhaust seats for unleaded pump gas (I ended up putting a full set of 16 seats in my early model BBC heads for another $300, plus redoing the valve job after trying to run old heads on unleaded pump gas, because it sunk several seats, intake and exhaust). That also doesn't include about $500 for new valves, springs, retainers, keepers, and seals.

I'm not trying to tell you what to do, just offering free advice from hard earned experience.