Mustang Evolution Forum banner

331

2K views 25 replies 5 participants last post by  smurf stang 
#1 ·
Im looking into building 331 stoker engine. My question is if I run a flat top piston with 2 valve reliefs can I run a trick flow stage on cam?

Sent from my SM-G900V using Mustang Evolution mobile app
 
#2 ·
TFS1 cam is way too small for a stroker you should be looking at custom grinds honestly. Also depends on a lot of other variables than just "valve reliefs".

Hopefully you aren't looking at doing this with a stock block. Putting forged stroker internals into a stock block is pretty much like putting a Coyote motor in a Kia.

If you are looking to stay with a stock block, honestly I would just find a lower mileage 5.0 pushrod, preferably one with GT40 parts like form an Explorer or a Cobra if you can find one and supercharge it. You'll make more power, you'll retain stock street manners/gas mileage and it'll cost less.
 
#5 · (Edited)
With the On3, you'll make just as much power with a stock 302 with a OTS cam and a set of GT40s as you will with a 331 unless you go aftermarket block. The block is the weak point at 475-525rwhp which you can hit with the stock internals so there is 0 reason to stroke/bore/whatever a stock block unless you are staying NA and even then...

Been there and done this, if I sound discouraging or negative its because I've seen sooooo many ppl build up a stock block to a 331/347, throw a blower on it and then start a "how much power is the stock block good for" thread after they just got done with a $10k build. Which is how much it'll probably cost with the fuel/trans/suspension/motor work etc... to make it all happen if the car is stock.
 
#6 ·
Ya I had plans on doing the on3 and just started kicking around the idea of a 331. I know I can throw the on3 on have it tuned and be at 450rwhp for 2500 bucks. And not have to touch my stock motor other than the gt 40 heads.

Sent from my SM-G900V using Mustang Evolution mobile app
 
#9 ·
Yeah boss blocks aren't that expensive but machining them is. I hope you know that they do not come finished they still require plenty of work. Break open your piggy bank and start reading up as much as you can.

Sent from my SGH-M919 using Mustang Evolution mobile app
 
#14 ·
You could also build up the T5 with stronger guts and still have a butter smooth shifting tranny.
 
#17 ·
Astro performance

Sent from my SGH-M919 using Mustang Evolution mobile app
 
#19 ·
I had a 3550, they shift like a box of rocks and are heavy. Either go built AOD or switch to an Astro A5. The Z spec is not much stronger than a regular T-5. The A5 will be a direct drop in, nothing else needed, not even a new shifter or crossmember although you should make sure you have an aftermarket shifter with the stops properly set if you are going to get a nice trans .
 
#22 ·
New bell, new shifter, new yoke, new crossmember and shortened driveshaft too. Probably be closer to $3500 when all is said and done. Not to mention the T-56 weighs double what the A5 does. Unless you absolutely HAVE to have that extra gear in between 4th and overdrive, stick with the A5 in a fox or 94/95 or stick with a T-45 or 3650 if you have a modular.

If I ever get another fox or 94/95 and its a 5 speed I will for damn sure be going with the A5, it's a complete no brainer.
 
#24 ·
The top A5 is rated for 585 and that is conservative. The top of the line A5 will be fine behind a 408 but I'd do a Coyote drop in before I did a 408. Then you can use a bunch of different transmissions including the A5 since Quicktime makes a bellhousing that allows the T-5 transmissions to be used in any modular app.
 
#26 ·
My boy has a turbo 363 with a Astro t5 and I love it way better than my upgraded tko

Sent from my SGH-M919 using Mustang Evolution mobile app
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top