big block heads

[phf]

hey guys i came across these here heads, big block, casting number 2406518. my decoder says they are 426 max wedge heads from '64. is that true or is there something wrong here?

 

[perfacar]

that is affirmitive on the head casting number. stage 3 type. you will need an intake manifold that fits the ports. congrats.

 

[phf]

i havent gotten em yet, i was jus checking. how much do those usually go for?

 

[phf]

oops, the guy got a mispring on the add, it turns out to be a set of 2406516 big block heads. he's asking $150, are they worth it?

 

[340mopar]

I personally don't think they are worth 150, they are small valve heads.


Chuck

 

[phf]

the intake valves are the same size, but the exhaust valves and ports a bit smaller

 

[BJR Racing]

What are you looking for? I have all kinds of BB heads some that customers didn't pick up and will sell for the changes.

 

[phf]

im not specifically looking for bb heads, its just that u have a 383 and a 440 shortblocks. i was just wondering if it'd b worth getting the 2406516 heads for $150

 

[BJR Racing]

There are better heads than those out there, IMO I would be looking for 902-346-452-or 906 heads before I would use the 516 heads. The runners are very small in the 516 heads and even porting them they are only as good as the newer heads. They are like 170 cc's and the 906's are 178 cc's and the 346-902-452 are 180 cc's from the factory. It takes alot of porting to get 10 cc's. 180 cc head is what I would use on the 383 and then port the newer heads to get 190 to 195 for the 440 and street use.
You want to use the stock size valves in the 383 heads and use the stock intake valve on the 440 and use a 1.81 on the exhaust side, these are the keys to make them run properly. The 440 needs more exhaust breathing than the 383 due to stroke and bore.

 

[phf]

so im better off getting the 906 heads for the same price?

 

[BJR Racing]

If you want the 906's then you'll have to add the cost of hard seats for unleaded fuels. The 452's already come with flame induction hardened seats and would be my choice for starters.

 

[sweatybetty]

arent the 516s close chambered?

 

[moper]

$150 is high for 516s. But, with some basic porting, they'll make 500hp on a 440 with a hydraulic cam. Closed chamber, poor exh port, 1.6(IIRC) exh valve, and a flat intake port floor with a poor short turn. They are decent for getting compression up a little, but it takes some work to get them to really make power. Cleaned cores go for under $100.