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#6048 01/03/2002 11:44 PM | Joined: Oct 2000 Posts: 108 Shop Shark | | Shop Shark Joined: Oct 2000 Posts: 108 | OK, I've heard in the past people talk about a 235 cyl. head with an "848" ending on it's casting # (carb. side) I've got one for a short block I'm rebuilding. What (if anything) is so special about them? Thanks. | | |
#6049 01/03/2002 11:52 PM | Joined: Aug 2000 Posts: 587 Shop Shark | | Shop Shark Joined: Aug 2000 Posts: 587 | Only thing I know is they were produced in 1960-1962, so I guess the last of the lot. Does that mean anything? | | | | | Joined: Nov 2000 Posts: 45 Member | | Member Joined: Nov 2000 Posts: 45 | In 1956 Chevy increased the compression ratio from 7.5 to 8 to 1 and then to 8.25 to 1 in 1958 on the 235. They did this by making the combustion chamber smaller. The "848" heads were used from 1956-62. In order to maximize the performance potential of the 235, the "848" head is recommended because of these smaller chambers. Not sure if there is any real difference between the 56-57 heads and the 58-62 ones, It may just be a "marketing ploy". | | | | | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | I've got a low compression '54 head that is ready to run, and a '60 848 head that needs to be rebuilt. Would the power increase with the 848 head be worth the cost of reworking it?
Chip
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
| | | | | Joined: Nov 2000 Posts: 45 Member | | Member Joined: Nov 2000 Posts: 45 | The factory brake HP for a 1954 235 w/glide is 125@4000rpm. A 1960 235 is 135@4000rpm.
Whats 10 HP worth to you? $300-$600 to redo the head depending on what it needs, not including porting or flow bench testing, how fast can you aford to go? | | |
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