Thoughts on a 355 stroker kit

[Purple-Headed Love Truncheon]

theres a thread on sc about pro comp.
need to be a mamber but
http://forum.streetcommodores.com.au....php?t=8552511

[hsv_wagon]

I'm not about to disregard the good advice given here, but that whole ebay kit appears half the price of a decent 355 crank alone. Are those cranks really that fragile even for a lower powered engine that's not going to get a real hard time?

I suspect the answer is then for a lower powered application the money would be better spent on building a stock cranked engine?

i paid $375ea for the last 2 scats i bought.that was dodgy deals though :wayned:

[Mighty Mouse]

soo.... whats the concensus on the COME cast stuff? better than eagle?
their kits seem pretty reasonable considering they are already balanced, etc.

Has anyone used their LS motor stroker kits? $3.8k for a balanced 427ci rotating assem?

[goose]

wildss - Right, that's what I'm getting at. But there's a difference between an engine build for track days vs one for the occasional WOT run on the street. I get the impression that that ebay kit isn't really even up to the latter.

[Purple-Headed Love Truncheon]

read the thread on sc

[HoonBoy]

I have for sale some very low km's 355 stroker parts, less than 2000 ks. These parts have been replaced over several removal and tear downs of my motor.

Brought as a PROCOMP 355 stroker kit and head, manifold, cam kit from Sydney Speed supplies AKA at racing world.

First up is a wonderfull set of valve springs that went soft within 400 ks, next is a set of 7/16 screw in studs 1 is sheared off 2 are bent other than that they are in perfect condition.

I also have a set of big end and main bearings that I never used as the brand new crank needed grinding, It had a 1thou taper and was also barrelled from over polishing, This kit was ordered balanced for the cost of $250 extra and was so out of balance it shook the car severly at 2800 rpm, I thought the needles on my dash were going to shake off.

Up next is a set of pistons and rings, these items have about 1200 ks on them, the rings failed to seat and created a nice smoke haze behind me, they would suit a buyer looking for a unique look to there car SMOKE. 1 piston has a small crack, nothing to worry about as it is barely visible, the teflon coating (or as I call it paint) is worn off, this happened in 2 hours while running in the cam and tunning. These pistons have had 27 thou taken off them as they stuck out of a non decked block that far, they have also had the gudgeon holes honed to alinge them as the pin was very tight in these full floating pistons.

Next is a cam shaft, I was sold it as a solid but its either ground wrong or a hydraulic it is very noisy at the 22 thou clearence as on the cam card, A copy of a camtech cam with a camtech box and cam card. On talking to camtech they DONOT and will not have any thing to do with procomp. This badly made cam also damaged my valves where the collets seat so I also have these up for sale sizes are 2.02 inlet 1.6 exhaust.

OK this was the final straw that made me write this, I was putting the head back together after getting them back from the machine shop, seats cut and new valves, I put the valve stem seals on and realised I had to put the spring seat washers on before them. so i had to remove the seals. I PULLED UP ON THE SEAL TO REMOVE IT AND PULLED THE TOP CEAN OFF THE VALVE GUIDE NOT ONCE BUT TWICE. Im not quite sure whats going on there, either I have super human strenght or these items are super weak, Ill let you be the judge. So I am also selling these there seems to be at least 10 good ones.

By buying my items that are already broken you can save yourself the heart ache of buying off sydney speed AKA at racing world and you will know you are buying rubbish, better still just put the money in a pile in front of you and set it alight where at least you will get some thing usefull out of it, WARMTH

I also have other item from the kit that are just as useless as the rest please contact me if you are interested in any thing. LOL AS IF.

The buy now is a rough estimate of what I have spent to fix every thing so far, its getting close to the $4000 I payed for the kit in the first place, I could have brought a C.O.M.E 355 stroker and head kit for that. And they may have cared if I had a problem.

From the thread

[goose]

Right. That's settled that then. Also http://www.performanceforums.com/for...php?t=67250113
And this: http://www.performanceforums.com/for...php?t=67246921

[Shifty]

how do these cranks break at like 40hp per cylinder?

[ChrisS]

Not much meat there...

Holy shit balls, that's one nice tidy break there.

C.O.M.E has been doing Holden Stroker kits for years now and they are not cheap but from the lack of bad feedback I have heard about them I'm guessing they make a good kit.

I almost bought a Eagle stroker kit for my SBC, glad I didn't now!!

[gmh265]

i paid $375ea for the last 2 scats i bought.that was dodgy deals though :wayned:

ha i got mine for $342

[hsv_wagon]

thats what most retailers seem to pay if they have good buying power

[BRK50]

so how do you guys get onto these cranks that cheap? i want a scat one holden journals. dont care what truck it falls off.

[hsv_wagon]

i know people that know people haha :knock:

[gmh265]

Here is a few photos of my scat crank. Apparently the newer ones are a bit different that make them easier to balance (less mallory) with a heavy piston, but also take more material out of the front web area that is broken on the crank in the photos above.

The casting of the scat looks much nicer, the lightning hole up the middle of the journal looks smaller and more in the middle of the web, where the crank above the hole looks like its on the piss.


I thought I would throw in a few photos of the forged SRP LS2 piston I am planning to use in my 355, it is under 400 grams so should almost balance up with my older model scat crank with little to no mallory.

[endlss]

about 4 - 5 years ago i had a come 355 motor built for my SS, i think it was about 6k all up including parts and labour installed and running....

made just on 300hp and 890nm (thats with a 5 speed)