aluminium head questions

440+6scamp said
Now I'm not so sure... I'm finding a lot of posts like this:

http://www.cuda-challenger.com/cc/index.php?topic=52902.0

I know that's just a few folks opinions but the exposed gasket and dropping valve issues seem to be repeated on several forums.

So, back to the MP heads. Everyone claims the "452" head (5153524) is the same thing as the Edelbrock RPM (in fact made by Edelbrock w/ a Mopar logo) but w/ straight plugs.

What about the MP 4876311? I can't seem to find any feedback about it. I would think it's a better choice since it has a smaller, closed chamber. Do people not prefer the factory 906's over the 452's for the combustion chamber? Why is so much made of the "452" Edelbrock copy head but so little mentioned about the "906" 4876311 head?

I know you already picked a head but the 311 I don't think is available anymore , the new 452 replaced it. The 311 is basically a stage 6 head with stock port locations. I have a set that are ported, they flow roughly 290 cfm at .600 lift. Don't believe any of the quoted numbers from the sellers, actual tests on production pieces show less flow, as much as 30cfm.

you asked this .... What's the length difference in flat vs hyd lifters? Will I have to change pushrods? , if you go to a roller cam you will need pushrods , adjustable rockers if you don't have them , a bronze distributor drive , a cam button , stiffen the stock timing cover , cam and rollers , about 1300 to make the switch .

How far in the hole are your pistons currently ?