Curious about AAR/TA Heads
- Thread starter Bodyperson
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Dartswinger70
Well-Known Member
Weren't those TA 340s more like 306 Cu In
oh I see. they were on the internet so they must be real.
Hyper_pak
Old School Chrysler Fan
I'm done wasting my time.
The cars from the factory were 340's. Trans Am circuit had a 5 litre displacement rule. Had to de-stroke the 340 to compete. The Trans Am circuit spawned some pretty rare cars.
I got why you shared the pic to show what can be done when pushrods are moved.
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You didn't.
Question 1- No.
Question 2- Actually no again. Best just to show dyno results from before and after. I believe the engine was still choking and needed an even larger cross section. But it did have a pretty small cam at 258/260 @ .050".
I'll never know 'cause I've given all this stuff up. I'm going out now to practice w/ my compound bow.
RPM.......LB-FT/HP before..........LB-FT/HP w/ opened pinch
3000.........467/267................474/270
3500.........471/314................471/314
4000.........480/366................486/370
4500.........554/474................558/478
5000.........555/529................572/545
5100.........554/538................574/557
5200.........555/549................572/566
5300.........554/559................569/574
5400.........547/563................566/582
5500.........542/567................557/583
5600.........547/583................558/595
5700.........536/582................552/598
5800.........534/590................551/608
5900.........529/594................538/604
6000.........527/602................534/610
6100.........521/606................533/619
6200.........517/611................529/625
6300.........511/613................519/622
6400.........507/618................516/629
MOPAROFFICIAL
If it has tits, it's a liabilititty.
Jmo. If that much work has been done that the pinch is the choke, sure, given the rest of the intake tract/manifold runner is sized right. Safe to assume it goes both ways if the intake tract is poorly matched/designed, the bandaid effect
If economy and low speed characteristics weren't important...we would have 200+cc intake ports on our small blocks
If economy and low speed characteristics weren't important...we would have 200+cc intake ports on our small blocks
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autoxcuda
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Yes. And rev’d high too.
It was done to legalize the heads and valve-train configuration for trans am road racing.
Actual race heads seem to be even difference castings that T/A passenger car heads. But have same casting numbers .
Boss 302’s weren’t anything that great on the street with their big valves and small CID. And I don’t think Boss 302’s made/make successful NHRA class racers either.
BUT the Boss 302 won the 1970 Trans Am championship.... that was the objective.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
They were dogs below 4200 rpm or so.
I've helped build a couple in 2000.
Keep it up in the rpm is the goal.
Ya danged killjoy.
gregcon
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That's why I never want to flow a head or dyno an engine or enter into those interminable cam profile discussions. They have the definite habit of sucking the fun out of cars.
PRH
Well-Known Member
Impressive gains in the mid-range...... even more than up top.
My guess is that up top it really wanted like what you said...... even more area.
But I think it probably could have made use of some more duration at the top of the curve as well.
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