I have a 92 gt with highly ported gt40ps, ported explorer intake, ecam and all the boltons.... it put down 250/275 rwhp thru the aod. How much power improvment would I be looking at with a 347 chp stroker kit? I think my heads and intake being ported flow a little too much for this cam/stock motor and it needs more room to breathe. I'd like to make somewhere close to 300rwhp would a 347 get me there? I'd also switch to a tfs stage 1 cam..... opinions?
Stroke it?
- Thread starter Nottoofast50
- Start date
FiveLtrRiceEatr
New Member
go with a CHP 331 Pro-Street, Ya you would most likely make 300 rwhp with that because you atleast (normally) get the +29 hp (1 cid = 1hp)
FiveLtrRiceEatr
New Member
Nottoofast50 said:
No you will need a few other things
-Haramonic Balancer (go with a Romac if you have the money, you wont reget it)
-Flywheel that is matches your haramonic balancer
-A new oil pan 7 quart, is a good idea but you dont need it but longer stroke requires more oil...(canton moroso, etc are good companies)
331 Street Fighter-Pro Street
Kit 9605-12073 $1,299.99
thats the kit I would recomend (I am getting it in about year, i dont have the funds right now
) with because everything is forged, in my opinion going with all forged is the best bet just incase you decide to get a power adder 
PlayboyRacer
Member
Nottoofast50, I asked the same question on a different forum and recieved the same advise from quite afew different people. I was told that the 331 is more durable and reliable than the 347, due to the less probablity of the common 347 oil issues. CHP and DSS have claimed to fix this problem, but for engine londevity that you cant beat, the CHP 331 won hands down. This is the kit that im gonna get, but like FiveLtrRiceEatr said earlier, my funds arent right. So right now, its now my wish list. My only question now is the machining & installation cost. Good luck, let me know how your stroker endeavor works out. I think im gonna go wash my car now, im jealous...
I have an auto so i dont see how i need a new clutch.... i do plan on going blown thx for the suggestion on the forged stuff. I've got a friend that owns a machine shop i'm going to see what he says about costs. I'm still trying to decide 331 vs 347. 
My friend is trying to convince me 347 will work great that it's all in the build and more power.
My friend is trying to convince me 347 will work great that it's all in the build and more power.
Legendary
Founding Member
FiveLtrRiceEatr
New Member
playboyracer said:
o ya block machining! thx for putting that in. Block machining i priced out for my self was over 1000, so im gonna get one of those level 20 cnc DSS blocks for 925. But since you want to get 300 rwhp you could always go with a dss level 10 block for 625 will all new bearing STROKER CLEARENCE READY. just my .02
The 331 will work better when forced induction is added. It's true that more cubes often means more power, but in this case it’s all about volumetric efficiency. Also keep in mind....although your horsepower goes up a fair amount with the larger displacement small block, it's the torque improvement that's really gonna make you smile.
cobradvm
New Member
I'm getting ready to drop in a 331 stroker with the Trickflow HCI combo. It ain't real cheap. Since all you need is the bottom end, I put in a cast Scat 9000 crank, Scat I beam rods, and Probe pistons. That was probably about $900 from Brian at www. adperforance.com Forged crank is overkill for a stock block - the block will fail first. The machine work was about $1200 - this included installing the heads, cam and degreeing the cam, balancing etc etc. Also put on BBK equal length shorties, Magnaflow catback, 255lph pump, AFPR, 30# injectors, 75mm ProM, new water pump, new oil pump, and so on and so forth. It all adds up - also throw in all new ARP 12 point stainless steel fastners, an Accufab 70mm TB/EGR.
Hmmm - I better go check my credit card statement - I think its on fire......
Howard
Hmmm - I better go check my credit card statement - I think its on fire......
Howard
I understand the 331 has a better rod ratio and is less stressfull on cylinder walls and such, but on the other hand, that is about it. Like said before, with forced induction or a high revving engine, maby that would be better but lots of people are taching 7K+ with 347's on stock blocks. The 347's generally put down more power all around, especailly in low end tq. Many feel that due to newer piston technology, the 331 is outdated, I don't think that is true though because it seems the "big boys" with poweradders that are running 302 based strokers with big poweradders are all running 331's, but the N/A, smaller power adder people are making the most power with the 347's.
About the forged crank being overkill on a stock block, that may be true but then agian if your block cracks you can always get a stronger block and reuse your crank w/o having to worry about your new crank being the weak link.
About the forged crank being overkill on a stock block, that may be true but then agian if your block cracks you can always get a stronger block and reuse your crank w/o having to worry about your new crank being the weak link.
