Overated BOSS Mustangs?

Jaydee · 02-20-2001, 03:55 PM

lx mike is correct that the Boss 429 motors were detuned big time for the street, as the corporate mission for these cars was not to make them street terrors but to get enough of the motors built to satisfy the homologation requirement so that Ford could go nascar racing. The carb was changed to a smallish (for this engine)735 cfm Holly, the exhaust manifolds were very restrictive and a lot of the earlier cars had very mild hydraulic cams - later cars got a more aggressive soild lifter cam which routinely whacked a half second off of the ET's. The thermactor emissions system used by Ford was also not well suited to these motors. The 14.09 et you quoted was from a 1969 issue of car life magazine and this car had a trap speed of 103 mph (the solid lifter cars ran as fast as 107 mph), which is more than enough for a low to mid 13's - also, remember that these times were run on small (F-60-15) hard compound bias ply tires. With a decent cam, headers and tires this beast would wake up big time.

------------------
1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rare Mustangs....Got One?	1969Mach1	Blue Oval Lounge	22	09-25-2010 04:59 AM
Safety Issue 64 - 70 Mustangs	Mach1 Cobra Jet	Classic Mustangs	20	07-11-2005 08:06 PM
Boss Mustang	stacy's stang	Modular Madness	7	03-17-2004 06:27 AM
´68-70 mach I´s best vintage Mustangs? Or boss 302?	Racer	Classic Mustangs	11	08-04-2001 11:07 PM
Boss and shinoa mustangs?	stng87	Windsor Power	3	04-22-2001 10:32 AM

02-20-2001, 03:55 PM	#9
Jaydee Registered Member Join Date: Sep 2000 Location: Conn. Posts: 220	lx mike is correct that the Boss 429 motors were detuned big time for the street, as the corporate mission for these cars was not to make them street terrors but to get enough of the motors built to satisfy the homologation requirement so that Ford could go nascar racing. The carb was changed to a smallish (for this engine)735 cfm Holly, the exhaust manifolds were very restrictive and a lot of the earlier cars had very mild hydraulic cams - later cars got a more aggressive soild lifter cam which routinely whacked a half second off of the ET's. The thermactor emissions system used by Ford was also not well suited to these motors. The 14.09 et you quoted was from a 1969 issue of car life magazine and this car had a trap speed of 103 mph (the solid lifter cars ran as fast as 107 mph), which is more than enough for a low to mid 13's - also, remember that these times were run on small (F-60-15) hard compound bias ply tires. With a decent cam, headers and tires this beast would wake up big time. ------------------ 1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25