I see everyone looking for the performance of the TF270 heads. I figured I would post real life side by side comparisons for everyone to see. First, I will list the car and engine combo.

The car, 225" slip joint dragster, 4.10 gear, PG w/1.80 first gear, Coan 5800 converter, 2 1/8" tube headers and total weight is 1770.

The short block is one I built 19 years ago for my 1970 Cuda. This engine has about 2000 street miles on it and I have no clue how many 1/4 and 1/8 mile passes it has...a lot though! I love it because I put gas in it, cool it off an hit the start button and go again, virtually zero maintenance between rounds or races!

The engine: (With E-Heads)
451CI - .055 over stock stroke
10.7-1 CR (0 Deck)
Cam - Comp Cams 258 and 262 @ .050 631/631 lift, spec'd by Dewayne Porter for me in 2005.
Heads E-heads ported by Dewayne Porter, 303 flow @ .600
Intake was a box stock Holley Street Domination
Carb was a 4150 1000cfm Holley

The Engine now: (TF270)
451CI - .055 over stock stroke
11.0-1 CR (0 Deck), this is because the CC is smaller
Cam - Comp Cams 258 and 262 @ .050 631/631 lift, same cam Dwayne Porter cam, no changes.
Heads out of the box TF270's
Intake Indy MW tall manifold (box stock)
Carb - Gen 3 1050 Holley Domination

So far I only have four runs on this new combo, still fine tuning it. Below are side by side comparisons with almost identical weather.

No clue how to load a chart, this took forever to get right (formatted in a legible format!)

I believe with a little more tuning and the right air, low 7.9's or high 7.8's are very possible with this current combo.

Dewayne, if you read this, that little street cam you spec'd for me years ago has been amazing!! However, I think a new one might be in order now for the new combo as this one just doesn't have the higher RPM range this set up needs now. With the e-heads, I was trapping at 6800, now I am trapping at 7300 and I have to much converter slippage too, not because of the cam...just because I do, for now .