So I snagged a pair of X heads...

[CultClassik]

Because they were basically free. For my use are they worth using? Need a full rebuild...

Eventually looking to build a 340, roller cam, maybe around 400 hp...for a sweet cruiser. I'm guessing these heads should be up to the task and cheaper than aftermarket?

If I use them, anybody recommend a good shop in DFW for porting and machining these?

 

[jimjimjimmy]

those heads are up to the task for 400 hp easy.....nice find

 

[Kegan B]

They are junk, send them to me i'll pay shipping....Kidding they will easily handle 400hp.

 

[1wild&crazyguy]

In stock form they have enough air flow for 400 hp, though only if the combo is correct for exploiting it

 

[1970Duster]

I sold my fully rebuilt set of X heads when I went to a roller cam do to clearance issues. So I ended up with a set of Edelbrock aluminum heads 60779.

 

[1wild&crazyguy]

I simply ground the pushrod holes oval to make room for my solid roller

 

[CultClassik]

Good info, thanks guys! I think these heads will be a huge help for a budget small block build

For the pushrods, is this for crazy cams or just roller cams in general will require head mods?

Last, all the valves are here except one exhaust valve. Obviously I'll need new springs, retainers, etc but should I keep the valves if they're good and just replace the one missing one, or is there newer valves that perform better?

Last - I've been saving the adjustable rockers from my 273 in case I need them. Any reason for me to use them on this engine or are non-adjustable ok? I'd like roller rockers but the price is so high for Mopar, not sure they're the best bang for the buck?

 

[fanofpetty]

Those X heads are considered to be the best factory casting that was made on any produstion 340. Thats a great score. The J heads are ok too, but were prone to cracking between the valves when overheated. I used to work in a machine shop, so yes I have seen a lot of these come through the shop, over the years. 400 H.P. is pretty easy to obtain with these heads.

 

[1970Duster]

Good info, thanks guys! I think these heads will be a huge help for a budget small block build

For the pushrods, is this for crazy cams or just roller cams in general will require head mods?

Last, all the valves are here except one exhaust valve. Obviously I'll need new springs, retainers, etc but should I keep the valves if they're good and just replace the one missing one, or is there newer valves that perform better?

Last - I've been saving the adjustable rockers from my 273 in case I need them. Any reason for me to use them on this engine or are non-adjustable ok? I'd like roller rockers but the price is so high for Mopar, not sure they're the best bang for the buck?

It was more because of the type of roller used. I used a hyd roller and with the hyd roller lifters it put the angle of the Pushrod at too far for my liking and had strong possibility of cracking and reducing the strength.
Pushrod
http://www.forabodiesonly.com/mopar/showthread.php?t=131950

Aluminum heads
http://www.forabodiesonly.com/mopar/showthread.php?t=132009

Pictures can be seen about what issues I had.
It is completely worth it to bite the bullet and use roller rockers because roller cams use higher spring pressure. I like my Comp Pro Mags :twisted: