TF270 vs. Indy 325 Big EZ1.....on a 512/400 ......B1's are not being considered due to special pistons required.
What's your thoughts? Which will make more HP? About to pull the trigger here.
Respectfully, for sure you are dedicated to this hobby and you get things done! You are asking for thoughts. Are these thoughts to help you best achieve your new goals? I'm eager to offer some suggestions based on your responses. For posterity, we should consider the last motor you built (which i would need a refresher on details) and how it ran. Other than the heads, what are you changing? Where you happy with what it ran before or is your plan to step things up everywhere?
MY thoughts are to ask some relevant questions:
1) What's wrong with the heads you had before?
2) What are your goals? (HP/ET?)
3) Are you imposing any limits to what parts to use? Are you imposing limits to how much you want to spend?
Ok so you bring up some questions....I figured I would keep it simple to see if one had a major advantage over the other....So a little background:
Last engine was a beast. It went 6.02 at 115mph on probably its third or forth outing with slicks that had two seasons on them. Had a guy make me an offer on it, I could not pass up. Sold it. It was a 543/440 with Indy Big EZ1 heads switched to 2.25 intake valves. Fully ported, and a .680 lift cam and nearly 14:1 compression.
Also had a 512/400 with those heads and it also went 6.00 in that combo...
Now building a very similar engine 512/400 block, now with a .713 lift Bullet cam and same duration, different Centerline I think, fresh slicks, and only 10.7 compression.
Same everything else....Goal 5.90 again....now with a little smaller engine.
PS....I had multiple buyers for the car drop out, so I did not expect to be doing this again with this car, and got a late start on it. Its well built and with the right parts, it should achieve my goal. Or sell this shortblock at the end of the season and build another 543...I probably should have one as a backup anyway.
