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Join Date: Jul 2000
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Re: ‘71 Chevelle 350, looking for direction
You said its been in your family since new,that's great.Is it a 2 bbl or a 4 bbl 350.It makes a difference in what you want to do with it. ----Copied & Pasted below ---
2 BBL would be the :
The 2bbl carburetor 145 hp (108 kW) version of the LM1 350. It was produced until the 1976 model year. It had 255 lb/ft (346nm) of torque.
4 BBL would be the:
The L48 is the original 350 cu in (5.7 L), solely available for 1967 in the Super Sport (SS) version of Camaro (1967-up) or Chevy II/Nova in 1968-1979. In 1969 it was used in almost all car lines; Camaros, Caprices, Impalas, El Caminos, Chevelles & Novas. The 1969 L48s use a hydraulic cam, 4bbl Quadrajet carburetor, cast pistons, 4-bolt main casting number 010 Blocks & casting number 041 or 186 heads. Power output was 300 hp (224 kW) SAE and 380 lb⋅ft (515 N⋅m) torque. Compression ratio was 10.25:1. The compression ratio of the L48 was lowered to 8.5:1 in 1971.
In 1972 the L48 (4bbl V8) option for the Nova was part of the SS Package. This is indicated by the fifth digit in the VIN being a "K". 1972 was the only year the SS package could be verified by the VIN.
The L48 engine was exported to Australia, where it appeared in the Holden Monaro from 1969 through 1974, and in the Statesman (automobile) from 1971 through 1974. Towards the end of the HQ series in 1973-74, due to US emissions regulations, the performance of these engines had dropped to the same or lower than Holden's locally manufactured 308 cu in (5.0 L) V8, which was not yet subject to similar regulations, so Holden's discontinued using the engine.
The L48 V8 was the standard engine in the 1975–1980 Chevrolet Corvette. The L48 V8 Corvette engine produced 165 hp (123 kW) in 1975. Power increased to 180 hp (134 kW) in 1976 and stayed the same in 1977. The 1978 saw 175 hp (130 kW) for California or high altitude areas and 185 hp (138 kW) for everywhere else. Power increased to 195 hp (145 kW) in 1979 and decreased to 190 hp (142 kW) in 1980.
C&P is done.
The best part is if its a 4 bbl it is probably a 4 bolt main making it an excellent basis for a strong running rebuild.If you're able to do most of the R & R yourself then $4K would probably get it done using good parts.Also if it is an L48, those engines almost always got 12 bolt rears from the factory.
71 El Camino SS
406 SBC M21 3.31 12 bolt
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