Dumb question here

[OMS]

"The 351C initially came out in 1970 in two (2) versions, the 2V and a 4V. The 2V had open chamber heads while the 4V had quench chamber heads. I believe that both versions had 2-bolt main caps.

In 1971, every 351C that received a 4V Carburetor received 4-bolt mains. The 2V and the 4V headed motors were continued. In mid-year (May 1971), the 351CJ was released. It had open chamber heads and 4-bolt main caps. It also had a hotter hydraulic camshaft than the standard 4V motor. There were approximately 144 Mustangs built with 351CJ engines in 1971."

I think only Boss 351's and the 144 CJ motors had 4 bolt mains in 71

Don

 

[cobra3073]

You are apparently correct Don!

I checked my "Hollander" and it would appear that the "Peterson Publishing" document from which I took the information might be in error as it relates to ALL the 4V having the 4-bolt mains.

GREAT catch!!

BT

 

[Bill73Ragtop]

"n 1971, every 351C that received a 4V Carburetor received 4-bolt mains. "

I have a '71 M code 351c with 2-bolt mains. Actually, - I always understood it was hit or miss and did not make much difference in the end.

 

[c9zx]

"The 351C initially came out in 1970 in two (2) versions, the 2V and a 4V. The 2V had open chamber heads while the 4V had quench chamber heads. I believe that both versions had 2-bolt main caps.

In 1971, every 351C that received a 4V Carburetor received 4-bolt mains. The 2V and the 4V headed motors were continued. In mid-year (May 1971), the 351CJ was released. It had open chamber heads and 4-bolt main caps. It also had a hotter hydraulic camshaft than the standard 4V motor. There were approximately 144 Mustangs built with 351CJ engines in 1971."

I think only Boss 351's and the 144 CJ motors had 4 bolt mains in 71

Don

+1 for Don on the 4 bolt mains in 71. To my knowledge every 4V 351C from 72-73 Mustangs and 72-74 for torino/montego etc had 4 bolt mains.

 

[FastE]

"The 351C initially came out in 1970 in two (2) versions, the 2V and a 4V. The 2V had open chamber heads while the 4V had quench chamber heads. I believe that both versions had 2-bolt main caps.

In 1971, every 351C that received a 4V Carburetor received 4-bolt mains. The 2V and the 4V headed motors were continued. In mid-year (May 1971), the 351CJ was released. It had open chamber heads and 4-bolt main caps. It also had a hotter hydraulic camshaft than the standard 4V motor. There were approximately 144 Mustangs built with 351CJ engines in 1971."

I think only Boss 351's and the 144 CJ motors had 4 bolt mains in 71

Don

+1 for Don on the 4 bolt mains in 71. To my knowledge every 4V 351C from 72-73 Mustangs and 72-74 for torino/montego etc had 4 bolt mains.

+2 on the 4bolt mains and the 72-74 4V's.The CJ's also got some bracket upgrades on the PS / AC brackets,a bigger drive pulley on the Alt. and a few other things,distributor,torque converter etc....

 

[goodnigh]

Great info with one minor exception. Only the Boss came with four bolt mains.

There was room on the block to drill and tap holes for a four bolt cap, problem being Ford never sold after market four bolt caps. Unlike GM products, Ford engines don't really need four bolt main caps. Go figure.

mike

I will give it a "shot."

The 351C initially came out in 1970 in two (2) versions, the 2V and a 4V. The 2V had open chamber heads while the 4V had quench chamber heads. I believe that both versions had 2-bolt main caps.

In 1971, every 351C that received a 4V Carburetor received 4-bolt mains. The 2V and the 4V headed motors were continued. In mid-year (May 1971), the 351CJ was released. It had open chamber heads and 4-bolt main caps. It also had a hotter hydraulic camshaft than the standard 4V motor. There were approximately 144 Mustangs built with 351CJ engines in 1971.

Also released in 1971 was the Boss 351 which was essentially the same as the 351 4V except it had solid (mechanical) lifters and camshaft. It also received the quench chamber heads and 4-bolt main caps.

In 1972, the 4V designation was dropped and all 10,249 4V Mustangs produced were actually Cobra Jets. These motors were essentially the same as the 351CJ that were released in 1971.

Also released in 1972 was the 351 HO (398 Mustangs) which replaced the Boss 351. It differed from the Boss 351 primarily with the use of open chamber heads. It also had a milder camshaft with less duration and a little more lift.

In 1973, the 351CJ continued as a 266HP (Net) unit in the Mustangs.

Hope this helps.

BT

 

[Widowmaker00]

Great info with one minor exception. Only the Boss came with four bolt mains.

There was room on the block to drill and tap holes for a four bolt cap, problem being Ford never sold after market four bolt caps. Unlike GM products, Ford engines don't really need four bolt main caps. Go figure.

mike

I will give it a "shot."

The 351C initially came out in 1970 in two (2) versions, the 2V and a 4V. The 2V had open chamber heads while the 4V had quench chamber heads. I believe that both versions had 2-bolt main caps.

In 1971, every 351C that received a 4V Carburetor received 4-bolt mains. The 2V and the 4V headed motors were continued. In mid-year (May 1971), the 351CJ was released. It had open chamber heads and 4-bolt main caps. It also had a hotter hydraulic camshaft than the standard 4V motor. There were approximately 144 Mustangs built with 351CJ engines in 1971.

Also released in 1971 was the Boss 351 which was essentially the same as the 351 4V except it had solid (mechanical) lifters and camshaft. It also received the quench chamber heads and 4-bolt main caps.

In 1972, the 4V designation was dropped and all 10,249 4V Mustangs produced were actually Cobra Jets. These motors were essentially the same as the 351CJ that were released in 1971.

Also released in 1972 was the 351 HO (398 Mustangs) which replaced the Boss 351. It differed from the Boss 351 primarily with the use of open chamber heads. It also had a milder camshaft with less duration and a little more lift.

In 1973, the 351CJ continued as a 266HP (Net) unit in the Mustangs.

Hope this helps.

BT

4v's defenitly came with 4 bolt mains in 72-73.