Need Help With BBC 840 Casting Information

mannymen · 08-05-2010, 07:42 AM

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.

gearjammer · 08-05-2010, 10:46 AM

Quote:

Originally Posted by mannymen

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.

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

Phil

Alan Roehrich · 08-05-2010, 10:52 AM

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.

08-05-2010, 07:42 AM	#1
mannymen Senior Member Join Date: Apr 2003 Posts: 728 Likes: 5 Liked 13 Times in 7 Posts	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. __________________ N/A

08-05-2010, 10:52 AM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,821 Times in 413 Posts	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. __________________ Alan Roehrich 212A G/S