I cant find a decent piston from either ROSS or JE that supportes a 3.75" Stroke + 6" Rod. Not without a Dome that is...

I did find one from TRW... its perfect... 9.2:1 compression with 68CC head, inverted dome for blowers. But guess what? Its special order!!

and on the CAMSHAFT note, I need a Hyd. Roller cam and im told i need to special order that too?! smaller base circle or somthing...

is my combo all that weird?

 

Call Wiseco or JE, they'd probably custom making you some.

Some places may have the small base dia cam instock. But yea, most have to be requested.

Or were you asking what places have these in stock.

However, your combo doesn't sound real weird to me.

 

We sell a few kits that you need:

STANDARD LINE:

-Reverse Dome
K264A3 -15cc 1.120 compression Height

-XLS Lightweight Flat-top
K261A3 -3.2cc 1.125 compression Height

-Standard Weight Flat-top
K116A3 -5.4cc 1.120 compression Height

PRO TRU LINE:

-Reverse Dome
P5009H3 -20cc 1.125 compression Height

-Flat-top
PT017H3 -5.4cc 1.125 compression Height


Wiseco Piston

 

Well Summit said that can have the special order pistons from TRW mid Feb. and they are only $399- which sounds like a decent price for some forged pistons.

I Would rather go with Wiseco or JE or somthing... But After looking at their "special" piston prices, the TRW's are looking better and better...

 

MJT I am interested in Wiseco pistons and will not order from summit until I have decided which is the best way to go.

Where can I get pricing for those pistons? I went to their site but cannot find anything except a catalog in acrobat format.

I tried jegs and summit but cannot seem to bring up those part #'s.

oh, and those are good for a daily driven car. right?

 

I have the PTO17H3 wiseco protru flat top pistons for my stroker,I'm using a scat 3.75 internally balanced crank with eagle 6" rods.There isnt anything wierd about the combo.My cam is the cc306 cam,no clearance problems... btw...I bought the pistons off of ebay new for about $100 less than what summit was charging. Do a search for 383 sbc and see what comes up.

 

here ya go...
http://cgi.ebay.com/ebaymotors/ws/eB...&category=6770

 

Call Probe Industries. I got flat top forged probe pistons for my 406 for $359.99. I got mine from raceparts$ on ebay. Here is the link. http://cgi6.ebay.com/ebaymotors/ws/e...d=raceparts%24

Also, I bought the 6" rods from them. They may have a phone number to reach them at or you can just e-mail them like I did.

You will have to use a small base circle cam. I have called almost all the cam manufacturers and they all agree with the small base. It is because the shoulder on the stock 400 rods were dropped down to clear the cam. I have heard of people making regular rods work by grinding on the rod bolts. Another advantage of having to use a small base cam is that since they will have to grind it anyway you can get custom cam specs for your particular application instead of just picking one out of a magazine. Hope this helps.

 

JE/SRP from www.flatlanderracing.com would be a good choice.

PN: 138093 for .30 over flat top 11:1 at 64cc. $484.00
Or 138103 for .30 over inverted dome 9.2:1 at 64cc. $530.00

The TRW flat tops I originally bought would not clear the throws on the crankshaft. Made several calls and was told to buy the SRP's and I wouldn't have any problems, and I didn't.

A custom cam from Comp. Cams is only $253 ordered directly from them. Most of the higher lift hydraulic roller cams are already small base circle. Such as the CC306 (8-306-8). If the base circle were any smaller you would have trouble with the lifters dropping too far into the factory link bars. (This is assuming you're using a factory roller block). If not you won't have any trouble with the retro-fit hydraulic rollers fitting anyway.

If you're careful on assembly you can clearance the rods to clear almost any camshaft.

Good luck and let us know what combination you end up with. It's hard to find this information without buying and returning parts.

http://members.sigecom.net/smaster/383parts.htm

 

Call Probe Industries. I got flat top forged probe pistons for my 406 for $359.99. I got mine from raceparts$ on ebay. Here is the link. http://cgi6.ebay.com/ebaymotors/ws/e...d=raceparts%24

Also, I bought the 6" rods from them. They may have a phone number to reach them at or you can just e-mail them like I did.

You will have to use a small base circle cam. I have called almost all the cam manufacturers and they all agree with the small base. It is because the shoulder on the stock 400 rods were dropped down to clear the cam. I have heard of people making regular rods work by grinding on the rod bolts. Another advantage of having to use a small base cam is that since they will have to grind it anyway you can get custom cam specs for your particular application instead of just picking one out of a magazine. Hope this helps.

 

What about part # SRP-138093????

Its for a stroke of 3.75", 6.00" rod length and is 030 over.

 

Sorry for the double post.

 

i just keep wondering why mine cleared and yours didn't........... maybe they found the problem and fixed it???

weird...

 

<b>Or 138103 for .30 over inverted dome 9.2:1 at 64cc. $530.00
</b>

I like those... From SRP... and the price isnt horrable....


Im worried about my crankshaft... I got the eagle 4340 3.75" Stroke crank, 6" SIR Eagle Rods, and im wondering will A machine shop have to balance these things together with the pistons / flywheel / damper?

 

i walked right into jegs and got my kieth black 6" 383 pistons. they sport a 9.5:1 compression with 64cc heads depending on gasket thickness and deck clearance. they have an 18cc dish btw. hope that helps.

 

Finding hypereutectic pistons for this application is no challenge at all...

and now comp cams says "sorry they dont make a hydraulic roller lifter that will work on a .9" base circle"

crap. now i gota run solid roller lifters on my stroker?

 

http://www.diamondracing.net/
I bought a NOS set of these pistons on ebay. They are 4.155 x 3.875 x 6.0. Forged blower pistons for chevy 400 +30 with 6" rods.

 

Im worried about my crankshaft... I got the eagle 4340 3.75" Stroke crank, 6" SIR Eagle Rods, and im wondering


will A machine shop have to balance these things together with the pistons / flywheel / damper?

Or can i just install the rotating assembly as it sits?

 

ok i just ordered #138103 from Jegs...


say do they come with spirolocks?

 

They should, mine did. There will be 32 of them. Two on each side of the wrist pin. Do a search online for directions to install them. It's kind of a pain the first few but get easy with practice. Actually, I think I read the direction on JE or SRP's website when you originally ask about getting some pistons.

Those pistons have an oil rail support. Be sure to read up on how to install those too.

 

i'm using Lunati lightweight racing pistons that I purchased from Dallas Export Sales. I have them hung on a 6.0 inch H-beam rod and an internally balanced 3.75" stroker crank. With the 9.005" deck height, (pistons down .005" in the hole at TDC), the engine will make 10.5:1 compression ratio with a #1010 Felpro gasket and a 68cc combustion chamber.



Hope this helps,
--Dan

 

<b>Those pistons have an oil rail support. Be sure to read up on how to install those too.</b>

WHAT is that? Whats it do? How hard is it to do? ????


<b> have them hung on a 6.0 inch H-beam rod and an internally balanced 3.75" stroker crank.</b>

DId you need to have everything balanced by a shop before installation?

 

It's a rail that goes into the bottom oil ring groove and is necessary because the wrist pin hole is so close to the bottom oil ring groove. It's nothing to worry about but you need to be aware of it.

YES! Your crank, pistons, rods, 1 set of rod bearings, 1 set of rings, 1 wrist pin and locks, flexplate/flywheel, and harmonic dampner, needs to be taken to a machine shop for balancing.

I'm no expert at building or writing so read up on it here. There's been several threads and there are many web pages that explain what to take to the machine shop and why.

Good luck, let us know how it turns out.