455 Horsepower TV Build

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Bill Boyle
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455 Horsepower TV Build

Post by Bill Boyle »

This YouTube video was posted this past March 2020 and is from the old HorsePower TV series. "The guys" build a 455 to dyno over 600 hp. Butler machining, Edelbrock heads and Victor intake, Ross pistons and Lunati roller cam are key components. Interesting to watch but as usual, most of the details are left out...after all it's television and it's all done in 11 minutes. :lol:

https://www.youtube.com/watch?v=tFfT5pEaBAE

I would have like to have seen the dyno results...how about you? ;)
"Dedicated to keeping the classic Pontiac engine alive."
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1979 Trans Am: 400 bored +.030, forged TRW pistons, ported 62 heads, Hedman headers, Pypes 2.5 SS dual exhaust X pipe, Comp 276AH10 cam, Scorpion 1.65 RR, 800 Q-jet, stock intake & tuned HEI; original owner.

Steve C.
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Re: 455 Horsepower TV Build

Post by Steve C. »

Presuming Lunati hydraulic roller lobes it would be about 242/252 at .050".

Rocky Rotella built a similar 474 cid / 4.250" stroke build using ported Edelbrock cylinder heads rated 316 cfm at .700" lift. The compression ratio was 9.95. It used a Comp Cams hydraulic roller cam with 242/248 at .050 and 0.540/0.562 lift with 1.5 rocker ratio. But with a 110 lobe separation.  It also used a Victor intake with a 1-inch spacer and a 850 cfm carb. Headers were 1.750" diameter. This engine made 578 hp at 5500 rpm.
 
Now take this information and 'upgrade' to the 320 cfm head with similar 9.8 compression, higher valve lift at 0.640/0.648 with the higher rocker ratio and the larger 1050 cfm Dominator carb. The video engine made 34 more horsepower. Also note it's cam was ground with a 108 LSA.

JayS.
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Re: 455 Horsepower TV Build

Post by JayS. »

It didn’t appear they used a crank scraper or a windage tray on the engine? I would think that would have left some hp on the table.

With the 1050, the spacer and that Victor intake they certainly had the induction covered. Very respectable dyno hp.

Steve C.
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Re: 455 Horsepower TV Build

Post by Steve C. »

I can't find it online to view but I would be curious if this is related somehow......

Horsepower TV:
Season 2, Episode 12
Description: Building a 600-horsepower Pontiac 455 engine.
TV Air date: December 30, 2000

JayS.
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Re: 455 Horsepower TV Build

Post by JayS. »

They used a Lunati solid roller cam on this engine. Which is nice to see for a change for comparison. Most of the Lunati solid rollers have an intensity of 33*-36*, they lashed it a at .024”. There are a couple profiles they could have used. But that solid roller cam would be 265*-268* @ .050 on the intake and 273*-276* on the exhaust.

Steve C.
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Re: 455 Horsepower TV Build

Post by Steve C. »

I just took a cursory look and found some Lunati SBC hyd roller cams and found two listings for 300/310 advertised and they were listed as 242/252 at .050". I just presumed similar to Comp lobes being based on SBC journal size and also presumed hydraulic roller lobes. Do you have a link for lunati lobe specifications ? Their website is useless !

JayS.
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Re: 455 Horsepower TV Build

Post by JayS. »

I think it may be the 268D and 276D list here on a bb journal it would gain some lift and duration
5280BBFD-96C5-4B6E-B724-14CBD321B7DC.jpeg
Unless it is a street oriented cam, then it it likely on of these. I think they might be some of Brookshire’s profiles. A UR44 paired up with the same profile family, I think they have a lobe in between the UR41 and UR42 that isn’t listed.
D4B6F628-7EE9-4040-BC5C-EC77DA6CEC33.jpeg

JayS.
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Re: 455 Horsepower TV Build

Post by JayS. »

Here is the Lunati profiles link. I don’t remember exactly were the lobe start. Down around page 170-200.

https://www.jegs.com/VendorInfo/Lunati/ ... atalog.pdf

Steve C.
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Re: 455 Horsepower TV Build

Post by Steve C. »

Thanks.
As always good call on your part and starting to make more sense now. The valve lift should of been the tip-off. They noted the use of lifter bore bracing and that would not be necessary for hydraulic roller cams (and some solid rollers as well). Then it was stated 'able to use 'up to' a 1.65 rocker ratio, not specific. Also at the end he stated 'relashed the valves', which I spaced the first time.

JayS.
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Re: 455 Horsepower TV Build

Post by JayS. »

I spaced the solid roller off too the first time I watched the video. Most video builds like this we see hydraulic roller builds. Nice to see one that isn’t.

I think they could have found another 30 or 40 hp. They lost some hp on windage. They should have used a different type of spacer under the 1050. Probably something with more shear, plus just guessing an out of the box 1050 could probably use some carb work to. Just guessing here, I think they were happy with their results and called it good :D
Last edited by JayS. on July 25th, 2020, 9:31 am, edited 2 times in total.

Steve C.
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Re: 455 Horsepower TV Build

Post by Steve C. »

And makes use of a 320 cfm cylinder head, which I presume was rated at a higher valve lift. Overkill for the lower lift hydraulic roller lobes.

Steve C.
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Re: 455 Horsepower TV Build

Post by Steve C. »

473 CID Pontiac engine.
4.250 crank
Ross .060 flat top pistons / compression ratio is 12:1 
Comp Cams solid roller camshaft 4028B/4032B R108
274/281 duration at .050" tappet lift
.4200" lobe lift
108 LSA 
Crower solid roller lifters
Crower 1.60 ratio stainless steel roller rocker arms
318cfm ported E-heads with 2.11 int. 1.66 exh. valves
Ported Dominator Victor intake manifold with 1" spacer
Carb cfm not stated
Custom oil pan with kickout

687 horsepower at 6300 rpm

Dyno sheet:
http://forums.maxperformanceinc.com/for ... 1460651405

Steve C.
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Re: 455 Horsepower TV Build

Post by Steve C. »

Another example...

468 cid
4.190 bore
4.250 stroke
6.8 rod

Edelbrock Heads- Race ported and custom chambered by Dave Bisschop at SD Performance
323 cfm at 0.600" lift
332 cfm at 0.700" lift
Compression Ratio: 11.07:1
Intake size: 2.190"
Exhaust size: 1.770"
Bullet solid roller cam
Duration at 0.050: 263/271
Lift: 0.700/0.700
Lobe separation angle: 108
Harland Sharp 1.65 rocker arms
Manifold: Victor / SD ported runners, finished with additional flange to runner porting and installed Brodix turtle
Carb: Holley Dominator 8896 /1050 cfm
Headers: Primary tube diameter 2"
Pontiac oil pan with full-length windage tray

"We made a bunch of pulls from 3,000 to 6,500 rpm on the dyno that day, stabilizing oil temperature to 175 degrees each time, and the best one produced 644 hp at 6,300 rpm and 622 lb-ft of torque at 4,900 rpm on 93-octane fuel. The engine has seen 650+ hp but not on this day. Other pulls ranged from the high 630s to the low 640s. Average horsepower through the 644-horse pull was 512 and average torque was 564 lb/ft."

Steve C.
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Re: 455 Horsepower TV Build

Post by Steve C. »

Also keep in mind different types of engine dynos used, different dyno cell design, proper correction factor, etc.,etc .... and who is running the dyno.  All can affect the numbers.  Example, Rocky's engine mentioned here was tested on a Superflow 901 engine dyno and the Horse Power TV series used a DTS engine dyno system. The last engine example I posted used a Stuska model XS-211 TrackMaster LC dyno. 

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