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I bought a set of L2443N Dome TRW 460 pistons for a very good price and will be using a set of fully ported D0OE-R SCJ heads with them and I'm wondering how durable these pistons are at 7000RPM and if the dome will clear the SCJ chambers without mods. It will be street and drag to get chassis ready to handle more power from the stroker going in next. I know they fit C8VE and D0VE heads without dome mods but what about the smaller SCJ chambers? Are these pistons reliable or do the skirts crack or ring lands break? This engine is temporary until the 557 is built so I'm not spending much money on just a 466 so I will also use my D6 truck rods also. It will be a solid flat tappet cam and 4000-4200 stall with C-4 in a 3700# '68 Falcon wagon and need to know about reliability and fitment of domes to chambers on those pistons with SCJ heads. It will be "0" deck and .042" thick head gasket if that helps with the dome fitting specs. Thanks...

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Mike R.
(no login)
209.244.123.68 pistons
No score for this post January 1 2002, 11:41 AM

Those should clear the D0OE-R chambers fine. I run a set of the L2443 dome pistons in my 460 with those heads. I even removed the head gasket and cranked it over when I was checking the valve clearance and it cleared fine. As for durability, I have had mine together for about 13 years now and I regularly turn it 6800. I also have the cj/truck type rods. I haven't had any type of piston or rod problems with it (knock on wood). My brother ran the exact same set-up for about 15 years and never a piston and rod problem either. I do plan on using steel h-beam rods in mine next time I do another short block, because I would feel a little safer that way. I also have not used nitrous at all, if you are planning for that.

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89 coupe
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63.20.87.25 What about nitrous?
No score for this post January 1 2002, 3:41 PM

Are those pistons able to hold up to some nitrous or are they not strong enough for nitrous and 7000RPMs? I know the rods are fairly strong but will they handle some nitrous too with 12+ to 1 compression? Thanks,

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Alan Casida
(Login AlanCasida)
65.193.82.175 Compression?
No score for this post January 1 2002, 6:57 PM

How much compression are you running with that setup?

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89 coupe
(no login)
63.20.85.221 Not sure what CC the domes are.
No score for this post January 1 2002, 9:59 PM

I am hoping for at least 12.5:1 compression but I have no idea how many CCs the domes on those pistons are plus I am doing a bit of chamber work to help unshroud the valves and perfectly match the bores. I belive 4-6CCs larger than stock chambers on the SCJ heads.

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Bob M
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63.25.252.21 Flat-top makes over 12:1 with your chamber...so...
No score for this post January 1 2002, 10:18 PM

I'm guessing you'll be well over 13:1.

I've been contemplating machining the domes off of mine for use with my D0VE heads, to both reduce compression, and lighten them up some, but after reading the above posts... I may just go for it since my chambers are slightly larger anyway.

Bob

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89 coupe
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63.20.85.221 Sure would be nice if that's true.
No score for this post January 1 2002, 10:32 PM

I like compression and if I can get over 13:1 with those pistons, that would be great. I will only be using a 250 horse shot until the 557 is done at which time all 350 from the Big Shot plate can be used without worry of piston or rod breakage especially with 13.5:1 with flat top pistons in the 557 but that will be later after the 466 is running.


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Dwyan
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209.34.34.2 compression with domes in 460
No score for this post January 2 2002, 7:24 PM

I run 466 cubes in a ' 69 block with .005 deck. I run c9ve heads with a tiny bit of smoothing in the combustion chamber and they have been surfaced about .010. My trw's are slighty massaged for larger valve relief and everything has been cc'd resulting in an actual compression of 12.25 to 1.dc

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89 coupe
(no login)
63.20.141.129 My calculations......
No score for this post January 3 2002, 2:00 AM

I calculated SCJ chambers after a little chamber work at 77CCs and +12CC piston dome with "0" deck and 4.50" diameter head gasket at .042" thick and came to 13.57:1 compression with 4.39 bore. If I had H-beam rods, I would stick the piston out .010" but since the stock rods stretch a little, I'm sticking to "0" deck. I also got 14.65:1 compression by using unmodified chambers at 74CCs and milling .030" off the heads to reduce volume by about 3CCs and 14.09:1 compression from chamber work to 77CCs and milling .030" for 74CC chambers and still at "0" deck. I will probably mill .050" off the heads but that is as far as I will go since I don't know how thick the decks are to begin with but should be fine since the small block heads I had in the past were milled .060-.080" without any problems.

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89 coupe
(no login)
63.20.85.221 What is the dome volume for L2443N Dome TRW 460 pistons?
No score for this post January 1 2002, 10:28 PM

I can't find that info out anywhere and Speed-Pro website is no help at all. Thanks...

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ken
(no login)
216.209.119.85 12cc's
No score for this post January 2 2002, 7:26 AM

Ran em for years in two motors. A good all around piston to 6800 daily

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89 coupe
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63.20.85.164 Thanks for info!
No score for this post January 2 2002, 5:54 PM

Thanks for the info. It looks like I don't have to worry about these holding up to RPMs and nitrous.

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randy598
(no login)
205.188.192.26 trw`s + nos = fun
No score for this post January 4 2002, 5:23 PM

ran ln2443n pistons with +.005 deck height (sticking out)and 75cc iron scj heads,stock cj rods, 4 bolt block,compression was 13.7.sprayed 250 shot for 2 seasons no problems till got greedy and leaned out gas and smoked 2 pistons (my fault).

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89 coupe
(no login)
63.20.119.148 What RPMs were you turning?
No score for this post January 5 2002, 2:16 AM

What RPMs were you twisting it to with that compression and nitrous? Sounds basically what I want to do with same compression, 250 shot nitrous, alum CJ heads, and solid roller. I don't know what RPM is within reason with truck rods and ARP rod bolts on 460s. I just made the switch from 351Ws and stroker 351Ws.

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randy598
(no login)
152.163.201.81 rpms
No score for this post January 5 2002, 3:31 PM

Ran 4speed liberty equallizer, left at 6000, shifted at 7100, whent through lights at 7200. Stock 460 crank,cj rods polished shotpeened arp bolts, as mentioned pistons, 4 bolt block half filled with blockfill, iron scj ported heads (342 in. 230 ex. cfm. at .700 lift @28" h20). T-ram with 2 660's. Made well over 100 passes with combo, extremely reliable motor.
 
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