Why did GM make the 4 bolt main?
Why did GM make the 4 bolt main?
Over the years, GM used the 4-bolt main as a marketing strategy to convince consumers that it was the right choice and it was for blocks made in the 1970’s. As consumers fell in love with the idea, engineers understood the concept, and GM’s car sales improved. Everyone was happy until the 1980’s rolled around and here’s what happened…
Which is better a 2 bolt main or a 4 bolt main?
They’re a better design, lighter, the rear mains are stronger and less prone to leak, the cam designs are better. Overall, it’s the block we prefer to build our engines with that has brought us the most success and almost a zero-failure rate. The block you want is from 1987-2002.
Where did the 4 bolt main theory come from?
Where the Theory Came From… GM started making the 4-bolt main in the 1970’s because their theory was that as power increases the crankshafts would shoot out the bottom of the engine. They believed that when you increased the load on the crankshaft, you increased the load on the main caps.
What kind of engine does a Ford 351 have?
Only the Q-code 351 “Cobra Jet” (1971-1974), R-code “Boss” 351 (1971), and R-code 351 “HO” (1972) versions have 4-bolt mains although all 335 series engines (351C/351M/400) have space for them even in 2-bolt main form.
Over the years, GM used the 4-bolt main as a marketing strategy to convince consumers that it was the right choice and it was for blocks made in the 1970’s. As consumers fell in love with the idea, engineers understood the concept, and GM’s car sales improved. Everyone was happy until the 1980’s rolled around and here’s what happened…
They’re a better design, lighter, the rear mains are stronger and less prone to leak, the cam designs are better. Overall, it’s the block we prefer to build our engines with that has brought us the most success and almost a zero-failure rate. The block you want is from 1987-2002.
What was the are code for a 1971 Ford 351 Cleveland?
The 1971 R-code “Boss 351” used higher compression (11.7:1) with the quench head 4V heads, solid lifters, an aluminum intake manifold, and 4-bolt main caps. so It produced about 330 hp (246 kW). 1972 R-code The R-code 351 Cleveland for 1972 was considerably different.
