yeah my next build is going to be a 331 or 351 base. Talking to this guru he said with a 302 or 331, going with the 165's will be wayyy more torqy down low. He asked me what my target rpm range is and I said at least up to 6500 but then again the car will be a wknd driving , non track car so might be satisfied up to 6000 rpm. He said anything that produces power over 6 is going to eat lower end torque. So I really need to decide which way i want to go. If i go up to a 351 I still want it nice and torqy down low too
AFR 165 and 185 differences on a stock 302?
- Thread starter Chowder Head
- Start date
-
Sponsors (?)
yeah i'm going to to a 331 or 351 base motor next so that figures into the equation. I still want good low end torque and a guy I have been talking to for over 6 months and helped me fix my car and helping me with future stuff said any intake that's going to make power over 6500 is going to eat lower end torque. Even the performer 2 i have now is 1500-6500 rpm
I personally would refrain from reving a stock block to 6,500rpms. In my opinion, the durability is significantly reduced in these engines at that kind of RPM. With 331 or even a 351, you can make enough usable power below 6,000 rpms that you may not make huge gains there anyway.
There's some truth to what he's saying, but 6500 rpm is not too much to ask for, and you really shouldn't go much higher on a stock 302 block, anyway. There's just no way to keep the main caps from walking. A guy named Marc Arnold, no relation to me, put together a '93 Cobra with an unconventional high RPM hydro-cammed 302 build. When he pushed over 7k, even on neutral balanced, forged, and girdled internals, there were clear signs that the mains were walking around - bad juju.
6500, though, is not a big deal, and I used to run my n/a 302 combo to that RPM. It was still pulling strong, and I had no issues to speak of. Low end torque was excellent, and the mild cam meant pretty nice street manners. I think it made a bit over 330 lbs-ft at a bit over 4k rpm, but was way stronger than stock at low RPM, too. Plus, if you don't like the low-end, you can always gear up. 1st gear with 4.10s will always put some crazy torque to the pavement. You'll probably realize that it's hard to keep traction, and high end power becomes more interesting, at that point.
I run a 331 for IMO correct reasons, but 95% of guys considering a stroker should be looking at a 3.40" stroke crank for a 342/347 instead of the 3.25" for the 327/331. Do some searches here if you want more info. I, for one, will not delve back into that particular subject unless the unlikely event of something new comes up, but there's a ton of threads here that cover the subject comepletely. Check 5.0 Tech's common threads index. It should be stickied at the top of the forum.
6500, though, is not a big deal, and I used to run my n/a 302 combo to that RPM. It was still pulling strong, and I had no issues to speak of. Low end torque was excellent, and the mild cam meant pretty nice street manners. I think it made a bit over 330 lbs-ft at a bit over 4k rpm, but was way stronger than stock at low RPM, too. Plus, if you don't like the low-end, you can always gear up. 1st gear with 4.10s will always put some crazy torque to the pavement. You'll probably realize that it's hard to keep traction, and high end power becomes more interesting, at that point.
I run a 331 for IMO correct reasons, but 95% of guys considering a stroker should be looking at a 3.40" stroke crank for a 342/347 instead of the 3.25" for the 327/331. Do some searches here if you want more info. I, for one, will not delve back into that particular subject unless the unlikely event of something new comes up, but there's a ton of threads here that cover the subject comepletely. Check 5.0 Tech's common threads index. It should be stickied at the top of the forum.
We disagree on that. 6,500 was not a problem in my experience, but for several reasons (regarding mechanical, powerband, and transmission shifting issues), I wouldn't go higher. I'd caution anyone going that high to set the limiter just above it, though.
cool man sounds good, I will definitely be doing some more researching and probably asking you guys more questions
and on the rev limiter thing, that's why i miss my msd box because of being able to put that 6k rpm chip in. I'm going to plug back up soon though and see how it does
