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Author
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Topic: SRP or probe?
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indyphil
Gearhead Posts: 2690
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 10-15-2004 03:44 PM
   
Ok, after lots of stalling. Im on the verge of buying a rotating assembly to start the build up of my 331. Im choosing a SCAT rotating assembly from cnc-motorsports.comIm buying a cast crank but would feel more comfortable with H-beam rods for high RPM capability. After that my only choice left is Probe Vs SRP. I dont really know much about either company - can anyone shed any light on this?
Thanks for your help, and feel free to jump in a critique my selection of parts/vendor BEFORE I go ahead an spend the money!! Phil ------------------
'68 coupe, '66 289 C code
engine, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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indyphil
Gearhead Posts: 2690
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 10-15-2004 03:57 PM
I suppose (having looked at both companies websites) I need to call CNC, since Probe make different types and I dont know which they offer - im assuming SRS - since they dont seem to offer the cheap FPS in stroker combos.Probe SRS are made of 2618-T61 alloy
SRP are made of 4032 heat treated alloy. Which is best for a moderate naturally aspirated 400hp stroker? They both say about low 10's compression for 58cc heads (I plan on AFR185s) Thanks
Phil ------------------
'68 coupe, '66 289 C code
engine, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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indyphil
Gearhead Posts: 2690
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 10-15-2004 04:00 PM
Ok I might be answering my own question. The 4032 alloy has more silicon and has less thermal expansion, so theres less cold piston "slap"
The 2618 alloy is stronger but requires more clearance for expansion so its a little rougher when cold.Do you think I could tell the difference? The probe are actually about $50 cheaper, but ill spend the extra on the SRP if I think its worth it. ------------------
'68 coupe, '66 289 C code
engine, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-15-2004 04:05 PM
Phil,
The builder I used is also a Ford guy who racer. He told me to go with the SRP pistons. I had a few other builders tell me the same thing. So I spent a few more dollars and went with them. ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics [This message has been edited by Fastymz (edited 10-15-2004).]
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SundanceKid
Gearhead Posts: 1273
From: UT
Registered: Feb 2001
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posted 10-15-2004 04:24 PM
Hey Phil, where did you find the SRP pistons? What are their prices like? I've looked into this a while, and from the information I've read I rate it like this: #1 SRP
#2 KB
#3 Probe
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-15-2004 04:35 PM
http://www.jepistons.com/sportsman.asp
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kid vishus
Gearhead Posts: 6395
From: middle of NC
Registered: Oct 2000
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posted 10-15-2004 05:42 PM
I've heard some people have bad experiances with Probe pistons. I would go with the SRP pistons.
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Ryan Wilke
Gearhead Posts: 2265
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 10-15-2004 09:31 PM
Phil,
I'm with Kid Vishus on this one.... I too have heard bad experiences with Probe stuff. I'd recommend the SRPs. I like the idea that SRP is a division (?) of JE Pistons, whom we know has a good reputation. GOOD LUCK!
Ryan 
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n2oMike
Gearhead Posts: 2680
From: Spencer, WV
Registered: Jan 2001
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posted 10-16-2004 09:34 AM
SRP!!!------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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Dave_C
Gearhead Posts: 1046
From: Gadsden, Al
Registered: Aug 99
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posted 10-16-2004 10:36 AM
SRP is good, but I have to admit that I have been happy with the Probe pistons in my 557 BBF. No problems with fit or performance.David Cole ------------------
557 BBF Powered, alcohol injected rear engine dragster. 4.90 @ 143 1/8 mile. 1.09 60'. I've got to be crazy to drive this thing.
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cracing
Gearhead Posts: 428
From: Saltillo Miss. USA
Registered: Jan 2002
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posted 10-16-2004 01:40 PM
Just what exactly was the problems with the Probe pistons. The reason I ask is, I'm in the process of building a 351/427 for a co worker & it has Probe pieces. Sure would be helpful to watch for certain things.
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Mpcoluv
Gearhead Posts: 1333
From: Charlotte NC usa
Registered: Apr 2001
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posted 10-17-2004 09:19 AM
Probe has a reputation for not supplying exactly what you ask and pay for.
A friend ordered pistons with TFS TW valve reliefs only, and got a set that had the overlapping normal and TW reliefs.
He specifically stated that he did not want the dual pattern.
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66-408-stang
Journeyman Posts: 60
From: lafayette, in usa
Registered: Nov 2000
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posted 10-17-2004 10:23 AM
Phil, if your intended use is mostly all street don't rule out KB. Most will say you need a forged, but for street the close fitting KB hypers will give you longer ring life, mimimize blowby, and reduce scuffing. They can be set tight, mine are under .002" (mim 0.0015)! I have them in my daily 408 that you saw, and it sees serious street fun. Some, like 89coupe, has used them with unreal amounts of nitrous (atleast 300) and still not had problems with them. He has had problems with forged! Just another thought...
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SundanceKid
Gearhead Posts: 1273
From: UT
Registered: Feb 2001
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posted 10-17-2004 06:43 PM
Even though I rated SRP's pistons over the KB's I too am going wth KB's. The cost to benefit ratio made the choice for me.
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Stephen & Horace Johnson
Gearhead Posts: 227
From: Gadsden, AL
Registered: Jul 2002
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posted 10-18-2004 01:56 AM
I have probe pistons in my 331, I havent had any problems... Good luck!!------------------
"Stand It Up" Stephen Johnson #2162
"Happy" Horace Johnson #2167
NHRA-IHRA SS/D 427 Ford Fairlane (Ex-Van Cleve)
National Record Holder
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indyphil
Gearhead Posts: 2690
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 10-18-2004 10:36 AM
I think I will go with SRP because of the material properties. The lower thermal expansion means less clearance and I dont need the outright strength of the Probe Material. I read a thread a while back attacking probe quality and the probe sales guy wrote a rebuttle on there. Also CHP make their engines with probe pistons and they have a great reputation. I dont think I can cut through the hype so Ill go with material properties as the decider.thanks for the input and Bill thanks for the KB input. I have thought long and hard about the KB pistons, but I would rather over build it with forged. ------------------
'68 coupe, '66 289 C code
engine, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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CometGT1974
Gearhead Posts: 412
From: Asheville, NC USA
Registered: Jan 2002
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posted 10-18-2004 01:22 PM
I run Probe pistons in my 347 and have had no problems, motor has been together 3 yrs and I spray a 250 shot on a somewhat regular ocassion.
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rdinmv
Gearhead Posts: 154
From: orange county CA
Registered: Feb 2004
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posted 10-18-2004 11:21 PM
I've been doing alot of looking at pistons myself for a 408 build, I've decided on mahle pistons, for a bit more than 500.00 you get a super lite (even lighter than most race pistons) forged piston with a set of low tension rings and to boot anti friction coating on the skirts and thermal barrier coating on the tops along with quality floating pins and wire locks. The pistons for a 408 weigh 337 grams complete, even a JE weghs more bare. If you have never heared of Mahle, they are a german co and make formula one pistons,OEM for mercedes,bmw,porsche and now for vettes,cobras and vipers. my 67 vert http://htwheelz.smugmug.com heres a link to one of the places to buy Mahles http://store.yahoo.com/hm-performance/mapoforsbfob.html
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91Stang
Journeyman Posts: 22
From: michigan
Registered: Apr 2004
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posted 10-19-2004 06:08 AM
SRP!!!!!!!!!
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indyphil
Gearhead Posts: 2690
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 10-19-2004 10:46 AM
I have heard of Mahle. We use them here very good supplier. In fact a friend of mine is the Piston engineer and he got a whole set of pistons for a 351 stroker motor for free! They are nice, and TMD sells them on Ebay. Im still open to them as an option but Im not sure I want to deal with TMD.------------------
'68 coupe, '66 289 C code
engine, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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