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Project Torque Monster

Project Torque Monster

Old October 28th, 2018, 07:35 AM
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Project Torque Monster

Looking at making a high torque 455 based engine for towing. I have a 1 ton dually 2 wheel drive truck that needs a engine and I want to install a high torque Olds in it. Now to the proposed build....

455 F block bored .060 over
N crank stroked to 4.500
scat 7.1Ē rods
9.0:1-9.5:1 compression stroker pistons ( I want 87 octane)
Lunati Hydraulic Roller
  • Advertised Duration (Int/Exh): 262/270
  • Duration @ .050 (Int/Exh): 211/219
  • Gross Valve Lift (Int/Exh): .541/.549
  • LSA/ICL: 112/106
  • Valve Lash (Int/Exh): Hyd/Hyd
  • RPM Range: 1400-5400
Double roller timing chain
MSD Pro billet distributor with 6AL ignition and adjustable timing adv/retard ****
C heads ported and polished with Manley severe duty 2.07/1.72 stainless valves (crossovers left intact)
Harland Sharp 5016 Rocker arms
edelbrock performer intake
Quick Fuel Brawler 750 cfm with vacuum secondary

Overall I want 625-650 torque if I can! Horsepower is secondary but Iím curious how much it might make!
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Old October 28th, 2018, 08:06 AM
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A few things.
For max torque donít use a 1.72 exhaust, 1.68 max.
Next a single pattern cam around [email protected] on a 110 or even a 108 would be better.
Dont waste your money on porting stock heads, buy aluminumís. Better chance of being able to run 87 with this combo.
And if you really wanted to go the extra mile, use a shorter rod. Harder on the walls but itíll automatically lower the power peak.
Hope this helps.

Last edited by cutlassefi; October 28th, 2018 at 08:08 AM.
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Old October 28th, 2018, 08:15 AM
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Mark I already have the heads and am using what I got as I have the valves already as well. Being that this is such a big engine I’d think it could handle the duration on this cam won’t it?


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Old October 28th, 2018, 09:42 AM
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Originally Posted by madmax442 View Post
Mark I already have the heads and am using what I got as I have the valves already as well. Being that this is such a big engine Iíd think it could handle the duration on this cam wonít it?


Ported factory heads with good machine work will easily deliver good performance. I'd use a BIG pan with that stroke.
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Old October 28th, 2018, 10:14 AM
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Oh yes I definitely will! Big pan is a must!
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Old October 28th, 2018, 03:40 PM
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Originally Posted by VORTECPRO View Post
I'd use a BIG pan with that stroke.
Actually with less rod journal diameter your oil supply requirements decrease. However with a larger pan you can keep the level lower and away from the crank.
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Old October 28th, 2018, 06:33 PM
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What are you.going to be pulling with this? I swapped a 455 in my dads 81 GMC half ton truck, people are amaze how well it runs and drives. Other than the engine swap, I changed nothing from the 350 Olds diesel that the truck originally had. Iím getting ready to swap in a limited slip rearend with 3.73 gears and a 700R4 trans, should be a major improvement over the TH350C and the 3.08 gears. The stock diesel is TIGHT, Iím hoping the remanufacted corvette torque coverter works well.
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Old October 28th, 2018, 07:16 PM
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I’ll be pulling a 28’ enclosed pace trailer with one of my cars, tools, parts, gas etc. My 71’ is about 3400 pounds. Torque is King!
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Old October 29th, 2018, 01:17 PM
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Originally Posted by matt69olds View Post
What are you.going to be pulling with this? I swapped a 455 in my dads 81 GMC half ton truck, people are amaze how well it runs and drives. Other than the engine swap, I changed nothing from the 350 Olds diesel that the truck originally had. Iím getting ready to swap in a limited slip rearend with 3.73 gears and a 700R4 trans, should be a major improvement over the TH350C and the 3.08 gears. The stock diesel is TIGHT, Iím hoping the remanufacted corvette torque coverter works well.
Even the 305 gas TH350C converter stalls around 1600 rpm. That should launch very nice, my 94 Z71 with that combo except an Olds 350 was nice. Of course you know transmissions and know that the 700R4 is not the greatest transmission behind big torque. Madmax442, if you have those current parts it should work Ok and have plenty of grunt for what you need it for. A body headers should work in the 73 through 87, 91 in some body style. They worked on my 78 1/2 ton with an Olds 350.

Last edited by olds 307 and 403; October 29th, 2018 at 01:20 PM.
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Old October 29th, 2018, 06:50 PM
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Originally Posted by olds 307 and 403 View Post
Even the 305 gas TH350C converter stalls around 1600 rpm. That should launch very nice, my 94 Z71 with that combo except an Olds 350 was nice. Of course you know transmissions and know that the 700R4 is not the greatest transmission behind big torque. Madmax442, if you have those current parts it should work Ok and have plenty of grunt for what you need it for. A body headers should work in the 73 through 87, 91 in some body style. They worked on my 78 1/2 ton with an Olds 350.

i got a smoking deal on a 9C1 cop car 700r4 (it was given to me &#128526 there have been lots of parts I have wanted to try Raybestos makes a special clutch pack (called the Z-Pac) itís single sided clutch discs for the. 3-4 clutch pack which has ALWAYS been a issue with the 4L60. Iím also useing Sonnax smart shell (in place of the factory drive
shell) it appears to be stronger than the Beast drive shell. Wide 2-4 band, super servo, big boost valve, 5 pinion planetaries from the 4L65-4L70E, etc. Obviously Iím not settikg it up with really hard shifts. Iím planning to work it pretty hard. If it breaks, it will be interesting to see what the next weak link is. If it doesnít, Iíll do a tear down sometime in the future to see how things are holding up.
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Old October 30th, 2018, 12:41 AM
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I’ll be using a Th-400 and going the way of a gear vendors as well. As far as converter I’ll probably have one custom built after the engine is done.
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Old October 30th, 2018, 11:10 AM
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I have a gear bender in my 69, itís the only thing I have ever successfully bid for on eBay! If I was starting with nothing, and buying everything new, and had to do it all over again Iíd probably do a 4L80E. The price of the controllers have come way down in price, and the lock up converter would be nice, especially towing.
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Old October 31st, 2018, 03:29 AM
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I’d rather just keep it simple with no sensors or electronics on it to make it run.
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Old October 31st, 2018, 05:02 AM
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Originally Posted by madmax442 View Post
Iíd rather just keep it simple with no sensors or electronics on it to make it run.
Yes.......Turbo 400
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Old October 31st, 2018, 08:57 AM
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Yup I have a TH-400 for it!
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