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#1
10-10-2017, 12:23 PM
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Piston selection for street 455
I am getting ready to order pistons for my 455 and found these;
http://www.jegs.com/i/Sealed-Power/8...9NF30/10002/-1 They are forged, have a pressed pin and price looks ok. Is the pressed pin a concern? Are there advantages to running floating pin pistons, do they cost more? What piston do you street guys run in your 455? bt
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#2
10-10-2017, 12:48 PM
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You can get them on EBay for 336.00
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#3
10-10-2017, 11:17 PM
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Pistons
Autotec pistons from Paul Knippen Muscle Motors. Forged, floating pins, and custom size no charge.
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#4
10-10-2017, 11:57 PM
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Having just assembled an engine using the typical Sealed Power forged pistons with pressed pin....
If I had to do over again ... would have gone with floating pins. Not because in my application they are any more likely to last, but because of ease of assembly, ease of disassembly, less for a ham handed guy at a machine shop to mess up. But bear in mind you will need rods suitable for use with floating pins. In any case your rod small ends will probably have to be sized/bushed for the pins. |
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#5
10-11-2017, 01:01 AM
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Quote:
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71 Formula 433, Splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, Torker II, Holley Sniper Stealth, Tribal Tubes, TKO 600, 3.73 Eaton posi. |
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#6
10-11-2017, 02:03 AM
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"...Are there advantages to running floating pin pistons, do they cost more?..."
Yes to both questions. Summit usually has the best price on the SP 455 pistons. Right now they are $312 shipped. They're plenty strong, but are heavy, have press pins, and a wide top ring. https://www.summitracing.com/parts/slp-l2359nf30 Here's a .040 over set for $300 shipped. https://www.summitracing.com/parts/s...BoCJ4AQAvD_BwE The AutoTec pistons will cost around $200 more. I'd say the cheapest good rods are the RPM H-beams. They're $400 direct, and come in both press-pin & bushed versions. http://www.racingpartsmaximum.com/sa...elhbeam-2.html Eagle H-beams are usually about $75 or so higher. https://www.nolimitmotorsport.com/prod/EGL-CRS6625PP3D http://www.ebay.com/itm/Eagle-CRS662...75.c100623.m-1 Last edited by ponyakr; 10-11-2017 at 02:33 AM. |
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#7
10-11-2017, 06:28 AM
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If your building the long stroke 455 with asperations of making peak power above 5400 rpm then you should not use Pistons that call for 5/64" compression rings, and these size ring grooves seem to go hand in hand with non floating pins!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#8
10-11-2017, 06:41 AM
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We've been using a good many Icon forgings here, full floating and hanging them on "H" beam 4340 rods, zero issues with any of those items to date.
There are other good forged pistons out there as mentioned, Ross, JE, etc, and I would not even look at a "generic" forged replacement piston and never go pressed pin either. For decades we asked for better parts and now we have them. Using the heavy TRW/Speed Pro style forgings and pressed pin just isn't a good way to go with these engines....IMHO......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#9
10-11-2017, 08:13 AM
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Are the Ross Pistons in the butler kits full floating or press fit
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
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#10
10-11-2017, 08:22 AM
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Maybe you should call them?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#11
10-11-2017, 08:50 AM
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I thought someone might know off hand
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
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#12
10-11-2017, 09:28 AM
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I've read that pistons made with the 4032 material require less piston to wall clearance than those made with the 2618 material.
So, would the 4032 pistons have any advantages over the 2618 pistons, for street use ?  Just wondering if that, for this reason, the 4032 AutoTec pistons might be better for a Pontiac street build, than the Ross or Icon pistons. One BIG advantage I see for going with the AutoTec pistons is the pin location option, for no extra charge. This can reduce the amount of block machining needed to achieve zero deck height. This savings can be subtracted from the price of the pistons. Therefore, I'd guess that the AutoTec pistons are the best piston value, for a mild to moderate Pontiac street engine. http://racetecpistons.com/pages/autotec.php Some guys wanna support the Pontiac vendors. Some low buck guys just want the best price they can find. The best price I found for the Icon IC888-030 pistons was from CNC Motorsports, for $499.95 + $19.95 shipping. I assume the AutoTec pistons are about the same price. Anybody know, for sure ? http://www.cnc-motorsports.com/icon-...ntiac-455.html Butler has the best price for Ross 455 flat tops, that I know of. Right now they are $549.95 + shipping. And that includes the pins. http://butlerperformance.com/i-24624...tegory:1234850 Last edited by ponyakr; 10-11-2017 at 10:21 AM. |
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#13
10-11-2017, 09:30 AM
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All Ross pistons have provisions for pin locks. The rod is either floating or pressed pin.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
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#14
10-11-2017, 09:32 AM
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I use Ross for street applications, 2618 and no problems. I'm building a motor for my brother right now with ICON forged and they are 2618 forged aluminum, just need the correct P/W clearance.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
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#15
10-11-2017, 10:27 AM
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Quote:
Weight? |
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#16
10-11-2017, 10:29 AM
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Quote:
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#17
10-11-2017, 10:51 AM
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OK people lets be better at not using what some consider profanity. We are all adults here. I removed the words and reply. Carry on...
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Try calling CRUSHPROOF! 512-386-9889 |
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#18
10-11-2017, 11:52 AM
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Thanks guys this a lot of info to digest but I have decided to go with Autotec pistons. My 455 block is in the shop being magna fluxed and I keep my fingers crossed for no cracks.
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#19
10-11-2017, 12:12 PM
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Quote:
I think the weight is 760gr. That's quite a bit lighter than cast or the 5140 rods. I think I remember Cliff posting that he has used several brands of Chinese H-beams, and all were very close to spec. The Scat rods are popular, and there are some no name rods on Ebay. http://www.ebay.com/itm/Pontiac-Scat...4383.l4275.c10 http://www.cnc-motorsports.com/2-455...ntiac-455.html http://www.ebay.com/itm/PEP-Falcon-H...hWk86C&vxp=mtr Butler also sells the Eagle & Scat H-beams. And I assume several of the guys here can order 'em also. http://butlerperformance.com/i-24453...tegory:1234853 http://butlerperformance.com/i-24453...tegory:1234853 Paul Spotts shows the Eagle rods for $479 + shipping, as does Paul Sandoval. http://www.spottsperformance.com/rods.htm http://www.sandovalperformance.com/_...onnecting-rods KRE shows 'em for $489 + shipping. http://www.krepower.com/Pontiac%20Cr...and%20Rods.htm Right now, Amazon has the lowest price I know of for the Eagle rods. But that won't help any of the Pontiac vendors. https://www.amazon.com/Eagle-Special.../dp/B000CN7ULM Last edited by ponyakr; 10-11-2017 at 12:49 PM. |
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#20
10-11-2017, 12:26 PM
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When I was researching pistons, Icon and AutoTech were the best bang for the buck out there. I looked at a bunch of different pistons and what they had to offer. Forge material, valve relief, ring packs, weight and price. There is HP to be gained with the smaller ring packs. I would do a hard block fill on a 455 though myself.
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