When did the AMC 258 come out in Wrangler?
The AMC 258 was introduced in 1971 in J-series pickups and Wagoneers and in 1972 in CJs. It continued to be used through 1990 in the Wrangler. It is basically a stroked 232 engine; some background about the AMC inline 6s (I6s) is given in the article about the 232.
When was the AMC 258 I6 engine changed?
The cylinder head was again changed in 1998 to a lower flowing, but more emissions friendly, design. The 258 used in ’82-’86 CJs used a computer controled Carter BBD. The computer controls mixture based on an O2 sensor and other sensors.
What’s the compression ratio on an AMC 258?
The 258 can be identified by the 4th character of the engine build date code (“A”, “B”, “C” or “M”), stamped into the engine block below and between the number 2 and 3 spark plugs. An engine stamped with “B” is an early 258 with a 7.6:1 compression ratio.
What was the length of the AMC 4.0 engine?
Connecting rod length was 6.125″ – similar to the discontinued 199 which was phased out in 1970. The 4.0 is one of AMC’s best-known engines. It was one of four AMC engines kept in production when Chrysler bought AMC in 1987. Chrysler engineers continued to refine the engine to reduce noise, vibration, and harshness.
Is there an AMC 258 engine for sale?
Looking for a Jeep 258 engine for sale? Look no further. We carry an assortment of Jeep 258 crate engine options, 258 long block alternatives and AMC 258 crate engine selections from premier brands such as Omix-ADA and ATK North America.
When did the 258 cu inline six come out?
The 258 cu (4.2) was produced from 1971 to 90 casting number cylinder head bolt diameter guide 1964-89 3.8 / 4.2 head casting 3227258 comes with 1/2 threads or 7/16 the oem 1/2 bolts are 3/4 wrenching / the 7/6 are smaller all bolts in both cases are the same lenght 1972-79 casting 809 & 490 1/2 head bolts
How to find a 258 inline 6 engine?
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When did the AMC inline six come out?
The AMC inline six was used to replace previous engines like the 225 dauntless when jeep merged with amc the 232 cu (3.8) was produced from 1964 to 79 The 258 cu (4.2) was produced from 1971 to 90