What about these heads?

[71chmark]

http://cgi.ebay.com/ebaymotors/CHRYSLER-383-400-440-CLOSED-CHAMBER-HEADS-CAST-516_W0QQitemZ350069662002QQcmdZViewItem?hash=item350069662002&

or these

http://cgi.ebay.com/ebaymotors/MOPAR-1968-71-440-383-906-Cylinder-Heads-OEM_W0QQitemZ110261302033QQcmdZViewItem?_trksid=p3286.m20.l1116

[6packCuda]

What are you planning on putting them on? The 915s, although more expensive, are probably the better choice because of the closed chamber design.

[MEK-Dangerfield]

The prices are REAL nice.  

I would feel better if they mentioned something about hardened valve seals, to deal with unleaded gas. Also, no mention of porting, so these would be stock heads, I assume.



  Mike

[Chryco Psycho]

I prefer the closed chamber heads for the combustion charicteristics , depends what the rest of the combo is though , with a big stroker you amy nto want that much compression

[71chmark]

Purple cam, 750 DP Holley on a torquer intake, 1 3/4 headers and a standard bore and pistons.  The heads I have now are stock 346 heads.  This is a 4 speed street car.  I want to replace and/or upgrade the heads and valve train to maybe get a few more hp.  I don't want to go too overboard.  You know the law of diminishing returns.  I have basically zero engine knowledge so would appriciate any advice.  I'm going with StRoKers roller rockers so do you think the 516s would be a good choice or maybe some built 906s?  Basically i'd like to get the best head for my combo and keep it under a thousand bucks.  If I ever go to a stroker I would upgrade the heads anyway.

[Jacksboys]

I agree with Chryco on the closed chamber design. 
I would also make sure they have harden seats, or you will have to add a lead substitute everytime you put fuel in the tank. (a real pain on a long trip)

What type pistons do you have?  When at TDC, how far are they in the hole?

[71chmark]

Stock flat top piston.  Stock block.  I'll measure when I get the old heads off.  How much room do you think I would need?  I remember there was some room.  Say I had the 516 or 915 closed chamber and the 1.7 Roller Rockers.  I just plan on using 93 octane pump gas.

[Chryco Psycho]

Agian it depends on the piston , anything over 525 lift could get into piston to valve clearance problems unless the pistons are ntoched , typically the closed chamber heads will increase compression by approx 1 point but usually you can get away with that as the factory compression was never as high as advertized

[Jacksboys]

Agian it depends on the piston , anything over 525 lift could get into piston to valve clearance problems unless the pistons are ntoched , typically the closed chamber heads will increase compression by approx 1 point but usually you can get away with that as the factory compression was never as high as advertized

[nivvy]

Agian it depends on the piston , anything over 525 lift could get into piston to valve clearance problems unless the pistons are ntoched , typically the closed chamber heads will increase compression by approx 1 point but usually you can get away with that as the factory compression was never as high as advertized

he will be at .520 net lift........ x2 on the closed chamber heads though.......

[moper]

You get waht you pay for. The 516s look better. The 906s pictured have not been milled...

[71chmark]

I like the 516 heads also.  Maybe I'll just get an assortment and try them all.  Where did I put that wallet anyway?