How much HP with this Combo?
 

Gen VI 454.
GM rectangular intake port heads with 2.25 and 1.88 valves.
9:1 compression.
Merc 500EFI cam shaft and associated roller valve train components.
AZ Speed and Marine EFI intake and plenum.
Merc 500EFI throttle body and injectors.
Stainless Marine aluminum exhaust manifolds.

Re: How much HP with this Combo?
 

I'm gonna guess 450 hp as the lowest number.

Re: How much HP with this Combo?
 

I would guess about the same.. Depending on the cam & actual heads you are running you may be able to get close to the 5's.. Some carbed 454's stroked to 496 & done right can get there. You have the added bonus & luxury of EFI.. :) Jamie / Lakeside

Re: How much HP with this Combo?
 

I think he needs more compression to get to 500.

Re: How much HP with this Combo?
 

My bad.. :chick: I didnt pay attention to the comp.. He could still raise the comp a bit if he can run 91/92 octane and he hasn't bought the pistons yet.. He will have to remap the PCM though to keep everything happy..

Pat, What type of fuel system & pump will you be running?? Are you planning to do any other head work? Or just bolt on & go??

I am a bit burned out after a long day, so please pardon me if I am statring to sound silly or a bit off of my game tonight.. The ol' ass is starting to drag :drink: :drink: :evilb: :D Jamie / Lakeside

Re: How much HP with this Combo?
 

Hey Pat, can I tag along on this thread? I'm probably headed down the same path.
Only 450hp from bolting on the most important 500EFI pieces? How different are those heads & comp ratio from the HP500 pieces? I guess the 48 ci are worth a lot of power?
I actually have in mind that 450hp goal for my project; wonder if I could save some $ by sticking with just the MPI system, and painting it blue :D
Thanks,
Michael

Re: How much HP with this Combo?
 

My guess is that if you loose the Stainless Marine and put some E Tops on and cut 30 thou off the base circle of the cam to crank the lift up some and add 7-8 degree of duration then you may almost make 500. You will have to set the cam up bang on and port match everything and turn to 5500 rpm as well. You will have to remap the computer and play with fuel preasure as well. Of course a nice air gap manifold and a stage 5 Bigs 750 carbon maker will give the same with a lot less agveration, oh and a lot less cash, you can use the saved cash to pick up a real nice MSD ignition. Now you can set the RPM and tune without giving Jim from AZ speed 500 a time. Just my thoughts. Jason

Re: How much HP with this Combo?
 

You're giving up 10% of the ci's and probably 10% of the hp as well.

Re: How much HP with this Combo?
 

Because Pat's using most of the parts that are used in HP500's but with smaller cubes, I would say about 500 hp but at a higher rpm than a HP500. Raise the rev limiter.

Re: How much HP with this Combo?
 

Hi Guys,
I have been collecting alot of parts over the last two years.

The base engine I will use started life as a 310HP/7.4MPI.

From this engine I plan use the following:
block
crank
flywheel
balancer
sheet metal
accessories ie. starter, alternator, water pumps, brackets...
EFI harness, sensors, and computer

Goodies in my stock pile:
GM rec port heads
500EFI cam and valve-train
500EFI injectors
500EFI throttle body
AZ Speed intake, plenum, and othe EFI parts from a Volvo Penta 7.4GSi
double fuel pump from Carter/Volvo Penta
Stainless Marine exhaust.

Items I still need to acquire:
piston (probably Keith Black)
rods (probably Scat)
gaskets

Then, of course, some machine work, balance the rotating assembly, assemble the engine, and have the ECU programmed.

I was messing around with Desk-Top-Dyno last night to see what numbers it would come up with.
I started by inputting everything I know about a Merc 500EFI and the puter spit out 500HP at 5000rpm.
Then I dropped the displacement from 502 to 454, raised the compression from 8.7 to 9, and went from open small tube header to small tube headers with mufflers.
The numbers I got were 465HP @ 5000rpm and 467HP @ 5500rpm. If I raise the compression to 9.5, the power goes up 10HP, but I'd like to be able to run 89 octane.
I would plan to run the engine at a max of 5200rpm with the rev limiter set at 5300 do to the cast steel crank.

Thanks for the input; we need something to BS about during the Winter months... :cool:

Re: How much HP with this Combo?
 

That cam is a little big for a 454 that will only see 5200. I would spend the extra $$ and get a forged crank and forged pistons. That way you won't have to worry when you spin it to 5500 +. Lots of used HP500 cranks around.

Re: How much HP with this Combo?
 

You may be right, but unless there is a great deal to be had, I'll be using the crank I've got.
Hell, I'd love to buy a stroker kit so it would make even more power.
Just don't have the extra $$... :rolleyes:

Re: How much HP with this Combo?
 

For guessing, I'm with the answers already posted.

500hp / 502cid's = .996 hp per cid

.996 x 454 = 452.184
.996 x 468 = 466.13

==============

Now, add a few for slightly more compression.

Big ? is what that big 2.25" intake valve will do for you - which includes how the cyl head person cuts the seats and if any bowl work and if correct/good bowl work is done.

Also, the 4.25 bore will shroud this intake valve a good amt. It even somewhat shrouds the 2.19 valve.

So, as others have said, a decent GUESS is 450-465hp or so. Any more, will be icing on the cake.

Re: How much HP with this Combo?
 

Pat, If you are looking to buy pistons and rods anyway and your weak link is the Crank. Why not just go with one of the budget stroker kits on Ebay and have a 496?

Re: How much HP with this Combo?
 

Pat I have a nice kit to build a 575 - 600 hp blower motor out of your 454

Here is a link , http://www.offshoreonly.com/esvon/page-13153.html

I also have my un cut steel crank balanced with new balancer and flywheel , worked dimple rods glass beaded, balanced with arp bolts, 7 pistons ( #8 is no good ), . I will also give you the block ( needs to be decked). All this and The blower kit I have listed in the classifieds for $3600 delivered to your house. I have more photos if your interested.

Paul

Re: How much HP with this Combo?
 

About the same horsepower it took you a year to make.
Course you could look at Scoggin-Dickey's website and find that a 454HO makes 425 HP, and a 502 HO makes 450 HP Same idential parts except CID, so your math doesn't work.

Thats why they bore notch the block.

Re: How much HP with this Combo?
 

Speaking of which, I forgot to show the 500EFi cam specs.

Here is what I have in my notes:


Merc 500EFI
Gen VI #169621 Grind#HR-292-2S-14 IG
292,298 at .004” Lift with 1.7 rocker .598” , .610”
230, 236 at .050”
ICL 109 , ECL 119
LSA 114


Part Number: 169621 Grind Number: HR-292-2S-14 IG
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1996 Up CHEVROLET 8 HYD. ROLLER WITH CAST IRON DISTRIBUTOR DRIVE GEAR
Engine Size Configuration
454-502 C.I. V

Valve Setting: Intake .000 Exhaust .000 HOT

Lift: Intake @Cam 352 @Valve 598 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 359 @Valve 610
Rocker Arm Ratio 1.70

Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 33.0 BTDC 79.0 ABDC 292.0 °
Exhaust 84.0 BBDC 34.0 ATDC 298.0 °

Spring Requirements: Triple Dual Outer Inner
Part Number 99896
Loads Closed 150 LBS @ 1.900 or 1 29/32
Open 454 LBS @ 1.310
Recommended RPM range with matching components
Minimum RPM 3000
Maximum RPM 6500
Valve Float 6800

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 6.0 BTDC 44.0 ABDC 109 230.0 °
Exhaust 57.0 BBDC (1.0) BTDC 119 236.0 °

Remarks:
CRANE 16535-16 LONG TRAVEL HYDRAULIC ROLLER- LIFTERS MUST BE USED WITH GREATER THAN .570 LIFT CAMSHAFTS TO PREVENT ALIGNMENT BAR DISENGAGEMENT.

Re: How much HP with this Combo?
 

Believe me, I would love too.
It would seem that most of the stroker kits I have found are for Gen IV engines.
I have found stroker cranks for the single piece rear seal Gen V and Gen VI engines so I'm sure kits can be put together for less $$ than buying the parts separately.
Either way, I simply don't have the extra $$ and it's not necessary to reach my goal at this stage of the game.

Re: How much HP with this Combo?
 

Great Info and I thank you.
RM Builder was nice enough to give me the cam spec a while back.

Re: How much HP with this Combo?
 

The heads that I acquired are off a HP500 carb engine so I am assuming they already have 2.25 intake valves. Being that the engine is a 454, the larger intake valves may not matter...

Re: How much HP with this Combo?
 

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.

Re: How much HP with this Combo?
 

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

Re: How much HP with this Combo?
 

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

Re: How much HP with this Combo?
 

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

Re: How much HP with this Combo?
 

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.

Re: How much HP with this Combo?
 

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.

Re: How much HP with this Combo?
 

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

Re: How much HP with this Combo?
 

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...

Re: How much HP with this Combo?
 

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! :D

Re: How much HP with this Combo?
 

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