Hi guys,

Has anyone seen or done any type of comparison of the 1970 Chev LT1 intake compared to say Performer or RPM performer intakes.

These engines were factory rated at 370 horsepower at 6000 RPM and 380 lbs-ft or torque at 4000 RPM, I know they had 11.1 and other good engine bits but only had unmassaged factory heads and to make that power at that RPM they must at least be comparable to other perfomance dual planes? :)

The stock 1967-1972 Z/28 (LT-1) intake is a quality piece and I've tested it VS the Vic JR and the Holley 300-25 and found zero ET or MPH differences between the three. Each intake lived on the car for months.
The Z/28 intake VS the Torker (original design, not that JOKE Torker ll) also showed zero performance differences when it was on a street vehicle that saw strip duty on the weekends.

A DYNO may have shown smidgens of differences between those intakes, that makes for Magazine sales, Ad sales, and has NOTHING to do with what happens between the start line and finish line.
If you have a Performer RPM, the Z/28 , or Holley 300-36, you have one of the best Hi-Rise intakes out there.

Thanks for confirming what I have always believed, Tom:
1) That which intake you use doesn't have as much bearing as the hype says, and
2) that the old Z/28 design rocks.

The stock 1967-1972 Z/28 (LT-1) intake is a quality piece and I've tested it VS the Vic JR and the Holley 300-25 and found zero ET or MPH differences between the three. Each intake lived on the car for months.
The Z/28 intake VS the Torker (original design, not that JOKE Torker ll) also showed zero performance differences when it was on a street vehicle that saw strip duty on the weekends.

A DYNO may have shown smidgens of differences between those intakes, that makes for Magazine sales, Ad sales, and has NOTHING to do with what happens between the start line and finish line.
If you have a Performer RPM, the Z/28 , or Holley 300-36, you have one of the best Hi-Rise intakes out there.

Hi Tom,
When you compared the intakes what sort of ET and speeds were you running @ roughly what weight and to what Max RPM.

Thanks Again:)

And don't forget Holley's old 300-36 intake here too!

pdq67

Current times are in the SIG.
Weight,,, I keep gaining, the car 3100 lbs.
Rpm's between 3500-6500 or so.
Would the X-planes shine better than the H-planes above 6500RPM, Probably.
But why bracket race an 8,000 RPM motor when 6500 will get you in the low 11's. Quicker if I wasn't so fat or had more cubes.