I've been reading thru the archives and there has been some good info relayed on different Predator head builds. I'd like to hear of any new updates or builds using these heads Wedge or Hemi. Any new parts available? What ever happened to the Cam F/X rocker arm programs? Who's got stuff lying around not being used? I only know of one build smaller than 550CID, anyone do a smaller CID build? Asking for a friend.

Following.
Of note I don't think you can get Predator heads for a 4.840 B/S anymore (at least for a wedge block) ???

Ran 4.80 in the 1/8 with a 572 B1 engine with a Pro charger #4 PSI like to build a predator engine for sure

I talked to Ken at Indy about a smaller cubic inch build not too long ago (528"). He said with the "as cast" head, you could probably get away with it. He told me they had experimented in the past with a smaller inch Predator, and found they had to turn it high rpm to make power. He said you could do it, but the engine would require a lot of valve spring maintenance.

There is/was a member here that had a 480-ish" Predator build, but I think they were running nitrous on it.

On my third Predator build now, just a bracket .90 deal but it will make some steam..

Oh yeah went 4.50's with my last one. Just a lowly NA 604" Predator.

You know my feelings on building one for smaller cubes. Seems like the perfect place for them

They only build Predator heads for 4.80" bore space block. FWIW we run a B1, Predator and a 600-13(on a 4.84" block) now.

It would be cool if they made a 5" bore space deal

I have been around 3 Predator motors. If you just want it to go to the car show, a small inch motor will be fine. If you want to run with the big dogs 605 would be my small and 655 would be ideal. 1400 hp is the norm with 2 carbs and no power adders. If you wanted to run a procharger I believe low 4 second passes and even high 3.90s are there.But that is big dollar block, rods, crank, transmisson, convertor, and especially the car.We are talking pro stock chassis with fire system.Good luck on your "friends" build. Birdtracker

I seem to remember DTHemi built a few.

Zero reason a smaller cube predator cannot work. I would think they would actually shine in such an application for oh lets say a smaller big block heads up style deal..

I do appreciate everyone's input but, I have to agree that I think a 540ish CID will work just fine if done smart. I feel the biggest gain you get with CID is the ease to make static compression. Once geometry is correct selecting a happy cam profile will help things live. Although I haven't measured them yet, the MCS on the big '460' Predator in relation to a 540 doesn't look off the charts. Growing 540 to '600' has less effect than growing a 440 to 500 although it's 60 CID either way.

Paging: DTHemi lol I haven't measured the exh port area yet but, based on Al's feedback I may start the primaries at 2.125

So I layed these two side by side because a picture says 1000 words. While I had them out I did a quick gage of the L W and radius of each at the port opening so I could calculate the cross-section. This is a 460 Predator beside a 440-1 Indy cnc'd by Modern. At the opening the MW has a larger area! 3.36" versus 3.16" Obviously it doesn't tell the whole story.

I also measured the exhaust port, which is nearly round. It is slightly smaller than 2.125" After looking at the trajectory and it has me wondering if the exhaust port is almost too good for the intake. That could make camshaft profile selection a little unconventional. But, I'm just throwing this out there and am open to feedback.

Look at the different routes the air takes, much straighter shot to the valve for the Predators. I need some

Predators were considered for my new build, however they are not legal for Ultra Street.

There is a reason that as most are ported make for very good power adder pieces

makes you wonder....why is an SR20 head ok, but a Predator is not??
At least i beat them up for two years on the rules and got the weight dropped for BB Mopar. IF anyone wanted to race a BB Mopar in Ultra or NMCA Extreme Street...2022 is the time

Can you share the quick dimensions?
I had a pair of Indy 440-1 CNC 345 (Indy's CNC porting), and for comparison they were:
Intake_ Width Height Area
Opening 1.375 2.650 3.644

Exhaust Width Height Area
Opening 1.960 1.550 3.038

The area calcs don't account for the corner radius, just LxW

MW 2.68x1.38 R .625"
Pred 2.46x1.95 R 1.38"