[68WarDog]

Recently I have purchased a Pontiac 455 engine built by Buck Racing Engines in King NC. Parts were sourced from Kaufman.

Engine is a 72 Pontiac 455 with a .060 overbore, compression is 11.57 per Wallace racing calculator.
Carb is a Shaker custom 9380 annular Holley 850, jetted 78 prim. 88 sec. Wilson 4 holes taper spacer. Torker 2 port matched to 290 Kaufman 72cc Eheads. Cam is an UD solid roller, 243/251@ .050 . 640 lift with scorpion 1.65 roller ockers Eagle stroker kit, crank, stock length forge rods. 4.211 Ross pistons. MSD R/R distributor,.Will start with 12/14 initial , 32/34 total..Will be using 110 fuel .
So guys what's your guess? Hopefully gets to the dyno in a month or two.

Roger

[77 TRASHCAN]

580 HP, monster torque!

[ta man]

Originally Posted by 77 TRASHCAN

580 HP, monster torque!

X2

I like that build.

[25stevem]

Key to making a good in the ball park guess is which KRE heads you have, D port or round port, and if your running headers or not?

With what I am posting here in reply to you I am assuming round port.

Also needed is the intake valve lift those KRE heads hit the 290 cfm mark at?

Also if that .640” intake ift is minus lash?

If we assume two things we can get a maximum hp number.

1) that the T2 intake has been heavily ported to flow over the 290 cfm that the heads do.

2) that your running enough lift at the intake valve to attain that 290 cfm , then your motor has the potential to max out at 596 HP.

With the info you have provided by my math come up with a number of 565 HP.

PS.
With the needed solid roller cam spring pressure needed you will want to keep a close eye on those Scorpion rockers.
A lot of folks have had issues with them!

If these are your first set of Aluminum heads running a can that needs lash, you will find that when you set the cold lash you can go .006” tighter then the cam cards hot lash setting .

[chuckies76ta]

Definitely close to 600 h/p 600 torque. Let us know what it does on dyno day. Thanks

[68WarDog]

Originally Posted by 25stevem

Key to making a good in the ball park guess is which KRE heads you have, D port or round port, and if your running headers or not?

A) 72 cc Kauffman 290 Eheads @ .700 lift.

With what I am posting here in reply to you I am assuming round port.

Also needed is the intake valve lift those KRE heads hit the 290 cfm mark at?

Also if that .640” intake ift is minus lash?

B) .640 lift with .022 cold lash setting

If we assume two things we can get a maximum hp number.

1) that the T2 intake has been heavily ported to flow over the 290 cfm that the heads do.

C) Port matched per builder.

2) that your running enough lift at the intake valve to attain that 290 cfm , then your motor has the potential to max out at 596 HP.

With the info you have provided by my math come up with a number of 565 HP.

D) That's close to what I was guessing. Although I've never dynoed the 470 in the GTO, the cam in the Bucks engine has the exact same UD lobes,(.3883). But the 470 is 254/262 @.050 .582 lift with the HS 1.5. I removed the 1.65 during the engines refresh. And add installed 20cc dish pistons vs the 16cc.( 10.8 to 10.4 compression). Also this Bucks engine is 11.8 :1).

PS.
With the needed solid roller cam spring pressure needed you will want to keep a close eye on those Scorpion rockers.
A lot of folks have had issues with them!

E) I have heard that too, and will be changing them over to HS.

If these are your first set of Aluminum heads running a can that needs lash, you will find that when you set the cold lash you can go .006” tighter then the cam cards hot lash setting .

F) Will post some of the paperwork to give as much details as possible.
Let me emphasize, I did not have this engine built. I acquired it after the party developed " payment issues "

[OCMDGTO]

Really cool build and I'd guess high 500's hp/tq. Mine made 10 or 15 more hp with a 1" open spacer vs a Wilson 1" 4 hole. Is this race gas only? Definitely interested in results

[68WarDog]

Originally Posted by OCMDGTO

Really cool build and I'd guess high 500's hp/tq. Mine made 10 or 15 more hp with a 1" open spacer vs a Wilson 1" 4 hole. Is this race gas only? Definitely interested in results

OCMDGTO, The builder is saying it'll be fine on 93 pump gas, but the day of the dyno. I'll be using 110 fuel.

[68WarDog]

Originally Posted by 68WarDog

Recently I have purchased a Pontiac 455 engine built by Buck Racing Engines in King NC. Parts were sourced from Kaufman.

Engine is a 72 Pontiac 455 with a .060 overbore, compression is 11.57 per Wallace racing calculator.
Carb is a Shaker custom 9380 annular Holley 850, jetted 78 prim. 88 sec. Wilson 4 holes taper spacer. Torker 2 port matched to 290 Kaufman 72cc Eheads. Cam is an UD solid roller, 243/251@ .050 . 640 lift with scorpion 1.65 roller ockers Eagle stroker kit, crank, stock length forge rods. 4.211 Ross pistons. MSD R/R distributor,.Will start with 12/14 initial , 32/34 total..Will be using 110 fuel .
So guys what's your guess? Hopefully gets to the dyno in a month or two.

Roger

A picture of the new family member

[tom s]

For grins take some 93 and compare some pulls.Might learn something.Tom

[68WarDog]

Originally Posted by tom s

For grins take some 93 and compare some pulls.Might learn something.Tom

Tom , yes that's a good idea. I saw an episode of Engine Masters where they compared an engine that didn't need the additional octane, and saw no significant gains in hp or torque. Is that your thinking?

[25stevem]

Just keep in mind that different fuel octane’s / blends may call for different jetting changes to be made to show if there usage is better or not.

[68WarDog]

Originally Posted by 25stevem

Just keep in mind that different fuel octane’s / blends may call for different jetting changes to be made to show if there usage is better or not.

Got it.

[tom s]

I had a RA V on the dyno and the operator put in race gas and it ran like crap,put 91 in it and all was good.Tom

[68WarDog]

Originally Posted by tom s

I had a RA V on the dyno and the operator put in race gas and it ran like crap,put 91 in it and all was good.Tom

Wow, that's interesting? Would think no significant difference. So may try the 93 non-ethanol first, and then the 110. The dyno operator ( Joey Arrington Speed Sport) should note any issues.

[25stevem]

See if the dyno your taking the motor to can measure the specific gravity of the fuel you swap to once you get a baseline pull done.
This testing will tell you which way your jetting needs to go even before the next pull is made and save time.

In most cases once you get a baseline in you will not find more then a 4 hp gain, but most importantly you will find out the absolute minimum octane you need to keep the motor safe long term.

Also be sure to do a hot cranking compression test so you have these important numbers for your records .



Are you taking just the motor to a dyno, or will this testing be done on a chassis dyno?

[Tom Vaught]

Originally Posted by chuckies76ta

Definitely close to 600 h/p 600 torque. Let us know what it does on dyno day. Thanks

AGREE! I will post 613 hp. 580 torque.

Tom V.

[blueghoast]

My guess-550 HP 610 LB

GT

[Dragncar]

Originally Posted by 68WarDog

Wow, that's interesting? Would think no significant difference. So may try the 93 non-ethanol first, and then the 110. The dyno operator ( Joey Arrington Speed Sport) should note any issues.

Pump gas engines always run worse on race gas. You are close to the edge at 11.57-1 but you should be fine. Do you know how much overlap the cam has ?
I am building a 11.50-1 stroker and all it will see is 92 all gas, or plain unleaded 91.
But the cam is very specific for pump gas.
Years ago a very good bracket racer at my track always mixed his gas. 10-5-1 iron head sbc. He ran out of 110 to mix one day. I told him he was fine, he ran straight 91 but was worried. Ran his best time to date and won his class that day.

[68WarDog]

"But the cam is very specific for pump gas.
Years ago a very good bracket racer at my track always mixed his gas. 10-5-1 iron head sbc. He ran out of 110 to mix one day. I told him he was fine, he ran straight 91 but was worried. Ran his best time to date and won his class that day."[/QUOTE]

Heres some information on the engine. Hopefully it's readable
Steve it will be engine dyno.