BBC heads any good?

i have a casting # 14092359 on a set of BBC heads that were given to me.. whats the specs on these heads and are they any good. they are going to go on a roller BBC setup for about 550-600 hp. a real torque monster motor, not so much high reving.

thanks guys

 

<table cellpadding="1" cellspacing="2" width="600"><tbody><tr bgcolor="#EEEEEE"><td>14092359</td><td>427</td><td>86-89</td><td>2.06/1.77</td><td>Open chamber Oval port</td></tr></tbody></table>

 

BBC oval port tall deck truck. Not a great head. Small intake valves, poor ports. Trade them for some 049 or 781's

All of these heads will take $$$$$$ to make good horsepower.

 

Chevy made these type of oval port heads for BBC engines through the years.

NOTE: Large oval port heads are taller than they are wide so don't forget this.. And they generally cc to 255 to 262 cc intake port size.

Little-bitty valved, hard to find, 1.84"/1.94"/1.66" valved large oval port generally truck heads that can be reamed out to standard 2.06"/1.72" valved heads fine.

Peanut port 2.06"/1.72" valved heads that have an intake port that is wider than it is tall and right at a 200 cc, intake port!

2.06"/1.72" valved 96.7 to 98 CC bathtub early "closed" bathtub-chambered large oval port heads.

The 2.06"/1.72" later relieved over by the sparkplug heads like the old -215's at about 100 to 101 cc chamber size. Great heads to work over, imho.

The -781/-049 open chambered 2.06"/1.72" heads that are great but they can cc from 113 to 122 cc chamber size so you really need to check them to determine your correct CR.

The later 2.06"/1.72" valved way open chambered smog heads that are squared off over by the exhaust valve. they look way big, but generally cc chamber wise at 113 cc's. Good heads to rework also, imho.

And finally the L-29 fast burn heads that cc around 100 cc's w/ a heart shaped chamber and 2.06"/1.72" valves. It is a true SMALL port, large oval head that cc's like 130 or so cc's intake port size vs a generally sized large oval port from 155 to 162 cc's.

pdq67

 

My max performance big block chevy book says: for street use a good starting point is large oval port 781, 049, 359 or 241 castings. I would get them cut for 2.19 intake and 1.88 exhaust maybe do a little port work below the valves, match the intake ports and intake manifold to the gasket and go with them.

 

im decking these head .070 and they are getting large stainless valves. my machinest is going to put the biggest he can fit.. i do all my own port and polish work so im gonna hog em out... im a ford guy so i know ford heads but this chevy stuff is a lost cause for me... i can make a dove head flow like a cj head.. thats what i was hoping to do with these BBC heads

 

I have a bare pair of 781's if your interested, these wont be free though.

 

After all that time$$$ and labor$$$$ you will have a pair of heads that won't flow as well as a set of off the shelf aftermkt heads, that cost much less.
I see it all the time.. Plus good luck on cutting those heads .070. Then you will need another few hundred bucks to have a dedicated intake cut for the heads.

 

I have to stay with stock cast heads for what I am using the engine for. Aluminum is not allowed.

 

And as far as .070 goes, I was told by a local dirt track guy it was doable ... So I'm just going off what i was told

 

Cast heads are available from many manufactures! These heads will be tough to get what you are looking for out of them. Your combo will have to be spot on to make good power with them. In other words your CI. to HP ratio will be low for the money and time spent!

 

Aluminum was not mentioned. Many cast aftermkt out there. I personally like to use World Product iron castings.

Then you would be far better off with 049 or 781 heads if stock type oval ports are required or 088-990 style heads if rectangle port heads can be used.

You can flow more "out of the box" with any of these castings. I do a lot of these heads. Just did four pairs of 781's last month. 2.19 intake 1.88 exhaust. Serdi profile cut seats with bowl hog and short side blending. +.100 long intake valves. Tool room springs, 10 degree retainers. Cut .020 deck.

This is pretty much standard operations for GM BBC castings and it ain't cheap.

 

As mentioned, it will be costly to make those heads peform, so better to sell them cheap and get some decent cast iron factory 781 heads, or aftermarket castings. Even with you doing the porting and polishing, there's still those big chambers.
I was looking for some 781 or 049 castings locally and stumbled onto two Edelbrock aluminum oval port heads with 2.19/1.88 valves, and 110cc chambers, plus Crane roller rockers in nearly new condition for well under $1,000. Couldn't buy good castings and build them up for the same money. Decent pair of rebuildable oval port, small chamber heads go $300-$350 around my area.

 

The 781/049 heads are probably the right answer but in my limited experience the late L29 heads can also be made to work well in torque-motor applications.

The L19 peanut-port heads, if you've never seen one, are amazing for a late engine design. They're stationary-generator heads, really. The intake ports aren't even adequate smallblock material. They are, IIRC, about the same cross-sectional area as the low-RPM ports of a 3-liter Taurus SHO V6 (which is about 3/8 of the total intake port area of those heads.)

 

I've got an extra set of 049's here in Buffalo.