CLASS RACER FORUM - View Single Post - 1969-1970 Boss 429's

Paul Ceasrine · 11-10-2011, 05:52 PM

Though a beautiful car,,,,,,,
The Boss 429 'Shotgun' did not arrive without it's problems.

The 1969 Boss 429's (first ones out) were 'slugs'.

Engine problems;
Valves too big
Cylinder head port passages 'monster size' worked against the flow
Weak valve springs
Hydraulic lifters
Connecting-rods too heavy
Holley 735 CFM carburetor undersized

* The engines could not rev above 4800 RPM's

Despite claims of 13.50's @ 107 MPH,,,,
Car Life Magazine tested one with 3.91 gears, in July 1969.

Performance Results; 14.09 @ 102.85 MPH.

1969 NHRA Classes; C/S or SS/F.

11-10-2011, 05:52 PM	#2
Paul Ceasrine VIP Member Join Date: Apr 2009 Posts: 2,546 Likes: 0 Liked 10 Times in 10 Posts	Re: 1969-1970 Boss 429's Though a beautiful car,,,,,,, The Boss 429 'Shotgun' did not arrive without it's problems. The 1969 Boss 429's (first ones out) were 'slugs'. Engine problems; Valves too big Cylinder head port passages 'monster size' worked against the flow Weak valve springs Hydraulic lifters Connecting-rods too heavy Holley 735 CFM carburetor undersized * The engines could not rev above 4800 RPM's Despite claims of 13.50's @ 107 MPH,,,, Car Life Magazine tested one with 3.91 gears, in July 1969. Performance Results; 14.09 @ 102.85 MPH. 1969 NHRA Classes; C/S or SS/F.