I hope he is getting the heads ported .
I have seen pontiac heads a few times and they could use porting to make power. those huge valves do not move the air like you would think they would.
I have ran the 270H in chevy small blocks and it will make excellent power.. more than the generic 224-234 on a 112 lsa cam.
I wonder why the low lift ..you could have that 270H ground using a SBC master and have .517" lift and duration would be about 227 @ .050.
Would make a nice one.
Buddy ran 6X heads with 2.11-1.77 valves and 8 eyebrow pistons in his 400. ran a [email protected]
.050 cam .495" lift 110LSA 6 degrees advanced.
It pulled hard to 6500rpm.
But was not quick as he had a 3840 LB Trans am and 2.41 rear gears.
That same car today has a 350" chevy with flat tops .005 above the deck ported 993's and 268H cam.
It will run circles around that 400" pontiac engine.
I always told him Port the heads.
You don't want to be beat by a SBC ..Port the heads.
As far as paper specs the voodoo cam above does not look too bad.
But the added exhaust duration could cause more overlap than the 270H and hurt MPG..I could pull 15 MPG with the 270H in a 350" with spirited driving tossed in and it liked to be shifted at 6900rpm. Ported heads of course 1.94-1.50 valves.
I also think the Ram air heads in 1967 were 670 castings and the ram air heads had the 2.11-1.77 valves and screw in studs not pressed in.
Correct me if I am wrong.
You can still have 670 casting and pressed in studs but those are not "Ram Air"