67 GTO 3" exhaust w/ Dynomax Super Turbo mufflers

Test run of the new 3" exhaust kit on my Goat. If anyone is interested, the set up here is a '73 SD 455 bored .60 over, .502 lift cam, factory 400 heads, an air gap style intake, Holley 600 cfm marine double pumper carb, headers, and Dynomax Super Turbo mufflers.

Category:

Autos & Vehicles

Tags:

• 67
• GTO
• Pontiac
• SD 455
• 3 exhaust
• A body
• Super Turbo mufflers

[dadstsi]

had the same mufflers on my 70 lemans w/ a 400,670 heads and a isky cam.man these pontiacs sound awsome with super turbos mufflers.

[jhamilton07]

@dadstsi Those are some nice heads. I still have a pair of 670's that came off an old 67 400 we built for this car (cam broke and knocked 3 lifters right out of the castings, block was junk). I wanted to put them on this engine, but my Dad talked me out of it. Good thing too. With stock 400 heads I'm running a calculated 12.5:1 compression. The 670's would have put it closer to 14:1. I'm right on the edge of needing race gas as it is.

[jhamilton07]

@dadstsi I have a new video with better sound quality up from after i finally got the idle right. Sounds much better now.

[dadstsi]

@jhamilton07 sweet! i have a 71 chevelle now,and i am regreting selling that old poncho.good luck on your goat she's awsome!

[marcoelisabethflores]

it is