Pat McPherson

Hey Guys,
I appreciate all of the comments and advise, please do keep them coming; it's a long winter...

Some new info:
I spoke with Tyler Crockett about this engine combo as I'm likely going to ask him do the programming of the ECU.
He told me that a 9:1 compression 454 does have the potential to make 500HP with the GM Heads, 500EFI cam, and headers. Mine will likely make 20HP less with the aluminum manifolds.
On the question of the crank, Mr. Crockett said the crank should have no problems with 500HP if the rotating assembly is balanced properly. He did agree that I should replace the 3/8" bolt rods.

Smitty

Pat
Make sure to do the relief in the block that will unshroud the valves and helps with power.

AIR TIME

Aren't the heads gen 5 on the 500efi,you have gen 4 block?? I though the water jackets did not line up??

BY U BOY

WATER PASS SHOULD NOT BE A PROBLEM. HE WILL NEED PISTONS WITH MORE VALVE RELIEF.

PatriYacht

Hp isn't the problem with that cast crank. Rpm is the problem. There is no way your engine will make 500 hp or even close to 500 if you redline it at 5200. If you want to redline it there, use a smaller cam. It will idle better, be easier to dock, and it will make just as much hp with more low end torque.

Pat McPherson

I do remember reading about notching the bores on 454s. Once I get the engine torn down, I ask you guys how to do it then. I'm assuming I'll have to go with pistons with a little more bump to keep the compression up.

Pat McPherson

I have a 1999 Gen VI 454 block.
The heads are from a 1996 Gen VI HP500.
There should be no mismatch issues...

Pat McPherson

I have two roller cams in my stock pile that can be use on an efi engine. A 454mag cam or a 500efi cam. I suppose I could have the 454mag cam reground to add lift but I'm not sure how much can be added. I have asked about regrinding in the past, and it's about $120. I'm not buying another cam so it's likely going to be the 500efi cam.
My goal is to make at least 1HP per cube and I think a 454 can make 454HP at 5200rpm...

KAAMA

JimV says that bore notching alone will bring about 30hp on a 454cid engine. He has done severl bore notching jobs on 454's. He has tested it on the dyno----hey, he's an airflow man and says it works!

the duke

You should be able to do this with no problem.

The last slightly modified 454 we built made right around 480 HP at 5500 RPM. It had
GM 049 heads with 2.19 intakes
bore notched
9-1 CR
victor Jr intake
850 Holley
Crane 731