T/A Cylinder Head Question

[bvfs12]

Does anyone know how to tell a long valve or short valve on the T/A cylinder heads ?

 

[jimjimjimmy]

as far as i know all the sb valves are the same length not sure about mags

 

[mopar410]

I believe they are all the same just has the pushrod at an angle on every other lifter and adjustable rockers.

 

[1wild&crazyguy]

T/A heads have more material in the push rod area and are drilled offset and therfore use an offset intake rocker arm which puts the the intake push rods at an angle. That was done to be able to widen the port window cross section for more air flow as well as allow more porting if needed. As for valve length, they came with stock valve length from the factory.

 

[70aarcuda]

TA head is a J head with the intake pushrod drilled at an angle to allow a larger intake port...nothing more..
uses stock 340 valves and springs.

except it takes TA rockers ...

 

[bvfs12]

If one would want to stick with the cast heads would T/A heads more desirable to have than J or X heads if you looking to make power in your motor? Another question is , is there anything else that is different in the T/A heads verses the J and X heads besides the offset rockers/push rods ?

 

[mopar410]

bigger intake ports= better flow over x or j heads and the x,j's have solid rockers(non adjustable).The TA's were designed to run on the 6 pack intake cars so they are designed to produce over the other stock type heads.So they would be the ones to look for if staying stock but they are very hard to find and for the price a set of aftermarket heads may be better.Also just because they have adjustable rockers doesn't mean they are TA heads,early 273 engines came with adjustable rockers but had smaller valves and the pushrods are straight up and down.The TA heads have 2.02 and 1.60 valves.

 

[rumblefish360]

While true all stock heads have the same length valves. To install longer valves also requires taller springs. The taller springs are 2 inches on height. Bring a rules to measure for this modification.

 

[perfacar]

hi, the TA head does not have bigger ports!!! they measure same volume as a regular 340 X or J head. pushrod hole was moved , so you could make port bigger. I have had a set on the flow bench, flows same as a J head. I looked up port volumes on NHRA site, volume is same as X and J heads. just food for thought.

 

[perfacar]

hi, I looked up latest port volumes,the 894 X head is 167 & 76 cc. T/A head/915 with 2.02 valves is 163 & 76 cc. 587 is 162 &70 cc,308 is 162 & 70 cc. just food for thought

 

[70aarcuda]

once again..A TA head is nothing but a J head with offset intake rocker...ports are not bigger from factory..but the moving the pushrod allow more porting...

for what it is going to cost to buy them along with the rocker gear....since only the TA rockers fit the TA heads...you are better off spending your money somewhere else for cylinder heads...

 

[mopar410]

hi, the TA head does not have bigger ports!!! they measure same volume as a regular 340 X or J head. pushrod hole was moved , so you could make port bigger. I have had a set on the flow bench, flows same as a J head. I looked up port volumes on NHRA site, volume is same as X and J heads. just food for thought.

hi, I looked up latest port volumes,the 894 X head is 167 & 76 cc. T/A head/915 with 2.02 valves is 163 & 76 cc. 587 is 162 &70 cc,308 is 162 & 70 cc. just food for thought

I didn't read where anyone said they have bigger ports or more flow in stock form but was mentioned in a ported alternative.Or what you "could" get out of them over other heads.

 

[70aarcuda]

I didn't read where anyone said they have bigger ports or more flow in stock form but was mentioned in a ported alternative.Or what you "could" get out of them over other heads.

just clarify the air.... unless you have an AAR or TA...I would not waste my money on them...JMO

 

[mopar410]

just clarify the air.... unless you have an AAR or TA...I would not waste my money on them...JMO

I agree totally in a cost aspect.You could probably build a strong motor for what a set of six pack heads go for if you can even find a set that doesn't need a total rebuild.

 

[bvfs12]

Ok. So if these heads don't have bigger ports as some claim and they flow nothing more than a set of "J" or "X" heads. Then why did chrysler make them so different for the 340 and not just install a set of "J" or "X" heads on the T?A challenger's. If one owns a T/A and they are trying to restore it back to original can't one just put a set of plain "X" heads on his motor and be done with it. They are very hard to find.

 

[70aarcuda]

Ok. So if these heads don't have bigger ports as some claim and they flow nothing more than a set of "J" or "X" heads. Then why did chrysler make them so different for the 340 and not just install a set of "J" or "X" heads on the T?A challenger's. If one owns a T/A and they are trying to restore it back to original can't one just put a set of plain "X" heads on his motor and be done with it. They are very hard to find.

the pushrods will move to allow additional porting...so from a pure racing...yes they were faster back in 1970...that was the best mopar had back in 1970.....

you can put a X head on a 340 6 pak TA motor...but anyone who knows anything about TA/AARcuda will spot the X head in a minute and know it is not the original casting for that engine....the TA heads usually have a O or U casting on them...mine have an U casting on them.

now a days..there are W2 heads...W9 heads that will out flow the TA heads by a mile...

as said...TA heads were the best available back in 1970 for the Trans-American racing series...and I am old enough to have watched them back then....