Garrett Ellison said

I would think 1.5 hp/cubic inch would be within reach with 13:1 and 110 octane. It's really dependent on how much V.E. the heads will be capable of through the full house RPM manifold. Historically, though, the heads are really a neat piece. The experimentation and lessons learned from those heads are what led to the W2 platform. An overall head design that is still more than adequate for a lot of purpose built race cars today.

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Garrett Ellison said

I would think 1.5 hp/cubic inch would be within reach with 13:1 and 110 octane. It's really dependent on how much V.E. the heads will be capable of through the full house RPM manifold. Historically, though, the heads are really a neat piece. The experimentation and lessons learned from those heads are what led to the W2 platform. An overall head design that is still more than adequate for a lot of purpose built race cars today.

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moparallen said

I have a very similar set of heads. Like yours, mine are the later 360 casting with the offset pushrod holes. Mine have been wildly ported, use a 2.02 intake valve that is 5.02 long, they have bronze bushed guides and were modified to use a W5 large port intake. They have also been O ringed and have brass oil restrictors in them. The ones I have are marked CTA 25 and CTA 26. Every exhaust port has been number stamped.
I think the CTA is a head shop marking maybe? I was told these were on a NHRA Super stocker when I bought them. Very odd heads for sure so I am somewhat glad to see another set. Although mine are not Mullen Modified like yours they do have the same base head.
Good Luck with them and I hope they do the job for you.

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