right now i have my stock 289 that is .30 over and built really well.

I am going to pick up some trickflow heads. However, next year i am going to build a 347 so i would like to get heads now that i can use on my 289 then also use them when i build the stroker.

Here are the heads http://www.summitracing.com/parts/TFS-51400004/

will these work well with both?

summit guy says they are great. may be a little sluggish at low rpms on the 289 but great at top end.

i have a really agressive cam by the way. it is a lunati 61003 with a .538 lift

 

IMO, the only issue I see might be your compression ratio (mostly for the 289). Do you know your piston cc's?

I built an application at work, I can run your cr on both motors if you post your piston size.

 

I love the TFS heads I recently put on my 331. I think they'd work fine on an aggressive 289, but like JMD said, CR may be a small issue.

You can do better than that price, though. I'll PM you a contact when I get home.

 

starfury

deffinatly send me the info. i found them for $1095 including shipping so far.

I will get my current parts list together and posted tomorrow

 

I agree.

 

Hm, apparently the company I bought mine from doesn't exist anymore. Nevermind...

 

Here is a demo of the CR...

same -5cc pistons, both 4.030 bores, same .03 thick head gasket, same 61 cc head.

289 = 8.3 to 1 CR. (a .030 over 289 is a 293)

347 = 9.83 to 1

This is a case where the pistons will really make a difference, if your 289 has 15 cc dish pistons you cr will be 7.29 to 1, if you 347 has 15 cc dish pistons your cr will be 8.64 to 1.

5cc and 15cc should be expressing the edges of what is typical.

 

thank you JMD. i called the dude for my part #s and i am waiting a call back. i will post my info as soon as i get them.

 

Those heads will be too small on a 347, but great for a 289/302. The 170's won't be sluggish at low rpm on a 289 unless you have a crappy cam profile. The TFS FAC 190 would be what you want for a 347, but on a 289 with a big cam, it'll need a lot of gear and rpm to run well. Really, what's good for the goose is not for the gander, what works well on one engine won't work well on a different one.

It also depends on what you plan on doing with it. If it's a weekend warrior/cruiser drag race setup, then the FAC 190 on a 289 with a large cam and lots of gear would work quite well, but if it's a road racing type 289 that needs broad power with good response at lower-mid rpm, it's highly unlikely the same setup would run well. You'd need a crapton of gear to make it work on a road course, and then it's unlikely that you have the driving skill to keep the rpm where it needs to be.

Also keep in mind that large heads/cam needs large compression. Fitting large heads like the FAC 190's with a large cam on an engine with 8.5:1 compression is gonna run like crap, unless you use boost.

That cam you listed with the heads you listed would work great on a 289 with minimum 9:1 compression, 9.5 or 10:1 would be best. Running under 9:1 is starting to get into the "less than optimal" range. But that cam head setup is way too small for a 347, it'll basically make the same power as the 289, just at a lower rpm.

 

right now i am running 373s in the rear end. my car already needs a lot of rpm. it had decent pull at low revs but if I want to get on it and make it move the sweet spot is 4k-6k rpms.
67 your post has me thinking now! i am wondering what is most important. keeping it strong and optimal now, or planning for the future and sacrificing a little until that time.