I don't know the cam specs except for the 0.050" duration, which at 218/223 is right in the ball park for a hp street blower cam. What's the LSA and the lift for this cam?

You can't make huge gains in chamber size by hogging them out, but it may still be worthwhile. But you need to call JE or Ross and them them what you need. You can often get a "custom" version of an off the shelf piston for essentially the same cost as a stock configuration. If they can make you a set of -31cc dome pistons in the correct compression height, I think that would work well.

When ordering a "custom" piston or rod it's smart to buy a set of 10 rather than 8 pieces. The "custom" pieces often have a lead time associated with them and single pieces may be 30-50% more expensive than the unit price for a set due to setup costs, etc.

Rich Krause

 

rich thanks for the advice...i'll work the phones and see what i can come up with....ideally i was hoping for 9.5 to 1 compression.. or do you think i should go lower...at 9.0 to 1..just to be safe or to be able to ramp up the boost at a later time..? again thanks for the help






Steve

 

SteveLT1,
I assume you got the srp flat tops. If you are going NA, these would be fine. But you're not, you are bolting on a blower. So I would return those and get the dished ones.
It'll run better with the lower compression.

Oh and on the rods, I would go with H-beams. They are very strong and you can get them for around $400/set. You can get the traditional forged I-beam rods for around $250/set, but once you see an H-beam rod in comparison, it is worth the extra $150.
There have been a few rod failures on the stockers. I haven't heard of an h-beam rod failing yet.

 

eds i got a set of 5.700 eagle h beams off the net for 389.00 the pistons i got were low compression pistons supposedly..its the 58cc head that makes my compression crap..ive been trying hard to find an off the shelf piston as good as the srps that would give me a 9.0 to 1 or 9.5 to 1 compression and have yet to find em....im still lookin...this ****s stressin me out heh





Steve

 

Speed Pro and Wiseco both have pistons for a 3.48 stroke with 5.7 rods that come out around 9.5-9.6 with 54-58 cc chambers. They are listed as 8.9 with 64 cc. I am pretty sure the JE makes some also.

 

tex thanks for the info the speedpro ones i found werent forged with that compression they were cast...i'll prob end up sending these pistons back to jegs..see if they carry pistons that will work for me










Steve

 

tex are speedpro powerforged pistons real good?.reason i ask is i found the pistons you were referring 2 for around 40 bucks a piston ..so 320.00 for a set...the srp's i got were 515.00 bucks a set....the speedpro pistons were 8.35 to 1 compression with a 64cc head.... at least the ones i saw at jegs...srp makes a good piston but..its for a 6.00 rod... they didnt have a piston at 9 to 1..with a 5.700 rod standard stroke at least..not at jegs..






Steve

 

Speed Pro is the old TRW. They are plenty strong, and a little bit heavier than the JE, pretty close to the SRP.
Wiseco pistons with rings come in around $500 also.. I don't think Summit lists the combo you need, but you can call and ask for them.
The Speed Pro is what I plan to run in my turbo motor.

 

I run the Speed Pro Forged Dished pistons in my car, and i know of 2 others as well. No probs with bottom ends.

Bill

 

guys thanks a ton for the help.....i'll call jegs..and tell them i got the wrong pistons for the application..when i orderd them, i asked them if they thought these would be good pistons for my setup...i should of known better......i'll get the speedpro's tomorrow...if jegs carries the speedpros that i need, i'll just get em from jegs..when i call in to have my other pistons returned for refund...again thanks for the help...cant say that enough lol






Steve

 

Rich i reordered pistons...the setup will be a 355 with stock stroke and rod length, 3angle valve job on the heads..with speedpro pistons here are the specs

SB-Chevy: 350
Supercharger or turbocharger piston with 21cc D-shaped cup and floating pin. Compression ratios:
8.35:1 w/std. stroke & rods, 64cc head
7.55:1 w/std. stroke & rods, 76cc head

844-L2441F30 +.030'', Each $38.99

the dude i talked 2 said...with a 58cc head id be at 8.8 to 1 compression or so........now id like to pick your brain about a cam selection..and call comp cams with the specs you provide..if you have the time..of course....also with that low of a compression should or could....i run 12 lbs of boost...its an ati p600b with a 2 core intercooler that will be front mounted...and...lastly what are the negative issues in reguards to running such low compression? will the car be a slug gas wise? id like to keep it as streetable as possible...ie..if i wanted to take a long trip..without driving from mobil to sunoco to hess every 150 miles etc lol again..guys thanks for all the help theres no way i would of done this without it...





Steve

 

Comp Cams XE lobes #3192/3196 on a 116LSA with a 112 intake center line. Set up the blower pullies to max out at the blower at ~6,200rpm.

You will like it.

Rich Krause

 

rich you are the ****..i cant thank you enough...serious....1000 thanks...if i can order ya a lunch and deliver it to do your door let me know lol















Steve

 

ok rich....he said..about the cam..... piston to valve clearance may be an isssue..and he stated the cam was quite radical...with 1.6 rockers im lookin at.... .606 intake and .626 exhaust lift..also...suggested for sure i get new lifters at around 230.00 bucks or so....asked me to call him back after i made contact with you in reguards to this cam..thanks for your time







Steve

 

Steve,
If you run a 12-rib belt setup on the P600B, you can either run a 12 psi pulley or a 15 psi pulley on the blower. I run the 12 psi blower pulley and see around 10-11 pounds on the gauge. I do have the twin intercoolers though-there would probably be a pound or two more of a loss of boost thru the smaller 2 core. You may want to check with ati on this one. The 2 core is supposedly only good to 500 hp. The fan shroud will have to be modified for the 12 rib setup to work, no biggie and well worth it.