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#21
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If I had a "real" 455 laying around I would never consider building a stroker. OEM parts are far superior to the aftermarket stroker cranks...... Go big or go home!
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************************************* 1968 Lemans. 37,000 original miles. GTO clone. 462ci/KRE 290 heads. UltraDyne 280/288 Solid/850 Qjet by Cliff/Performer RPM/TSP 9.5" in TH400/8.5" 3.42 gears/3950# Race weight/12.58@106 at Bandimere speedway high altitude |
#22
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How much power do you want and what is your budget?
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#23
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Store the 389. Build up the 455. Two bolt mains good up to 600HP. Good advise from previous post.
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#24
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NOPE. Useable 400 blocks are far more common than 455s these days. ALL stroker cranks will fit in a 400 block with minimal grinding. What you will have is a 3” main 455 with far lower bearing speeds, which is an Achilles’ heel of the 3.25” main Pontiac engines.
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
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#25
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Quote:
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
#26
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Forged 4340 is superior to cast iron in every way. That said the Scat and Molnar are the only ones I would buy. Have had 3 Scat forgings and all were right within spec. Still have 2 and wish I never sold the other 4" unit. One Eagle cast and stroke was off and .001 tapper on all journals. Had to be re ground NEW. Molnar- Scat 4340 best. Molnar will send you a call tag to pick up your crank or rods if off spec any at all. Stand behind their stuff.. Then Eagle forged Ohio forging. RPM forging. Had one of those and sold it. Wish I still had it too. You can push a Scat 4340 crank to 1000 HP. Try that with any OEM cast crank and you will have a lot of scrap metal in short order. |
#27
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I believe a factory 455 crank will last up to the power limits of the 455 block.
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#28
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If you are big time drag strip or roundy round racing sure. I have a 455 over 500 HP for years and years. One of the reasons it has lasted is I have refused to use any main bearings with only the single round oil hole in the middle. The shot of oil comes from the tab side of the 3 holes that intersect and if you do not drill a hole in your main bearing that oil has to hit the back of the bearing, mover over and go through the stock hole location. By that time the crank oil hole has gone by. Fine if a stock grandma,s station wagon but in a performance use you will starve your rod bearings at high RPM. I even drill our the race bearings with a oil slot vs round hole on 3" main bearings. |
#29
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CNC chamber only comes in 72 cc so you will need to buy dished pistons which adds a small cost but worth it. You can run 10.5 CR no big deal. Even more but you will need the right camshaft, tune is critical. You can run the 80 cc High Port like I have but for what you are doing no need for raised port. You best bet might be a nice used set of 87 cc E heads. They are around. Old school chambers, so what. Will get it done. |
#30
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The engine now has aluminum heads on it vs the factory heads. I am going away from the solid lifter stuff and will run a flat tappet Hydraulic cam with Rhoads lifters otherwise I would leave it alone. . The engine has HO Try-Y headers. Remove the early engine and oil it up and store it away and go with the basic 455 engine. The car will be a enjoyment to drive and still perform a lot better vs the 389 engine. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#31
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I hope we get to hear about you driving the GTO, here one of these days!!!
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#32
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The Virus threw off my timeline for firing the engine.
I want to test the engine on my engine run stand first and make sure all of the systems and gaskets are working fine. The welder, I contracted with, normally would have had it built at the beginning of the year. He is actually barely started on the "run stand"project due to the virus and other $$$ projects at his job. So it will be a this fall fire-up hopefully. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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