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Author
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Topic: cleveland question
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kewljay223
Gearhead Posts: 263
From: Long Beach, California
Registered: Sep 2002
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posted 12-19-2002 01:48 PM
   
the cleveland started in 70 right...? when did the block change and which ones are better??
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rm302 boss
Moderator Posts: 649
From: Austin Texas
Registered: Dec 2002
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posted 12-19-2002 02:08 PM
70-72 some have a 4 bolt main which are real tough to find. after that i dont know much...
The 4v,cj and boss blocks are real close. I have one of each and i cant find any diffrence. They all have 4v heads until in 72 they went to an open chamber head. 4v and cj have a 90% nodualar crank and the 71 boss had a steel. the boss had 1041 h beam forged rods ( that had the works done on them shop peened flux,180,000 psi rod bolts.. the 4v-cj had the same rod but no good stuff done. None of this stuff was done the the 2v block and heads and crank....
Rene
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1970 Boss 302
1990 Taurus SHO
1985 Mustang GT 351W
1995 Land rover Disco
1980 Triumph Spitfire (auto-X car)
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SteveLaRiviere
Administrator Posts: 34763
From: Saco, Maine
Registered: May 99
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posted 12-19-2002 02:26 PM
The Clevelands ran from '70 to '74, after that they became 351Ms, which was a destroked 400.
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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Be sure to remember our sponsors, Mustangs Plus, NPD, and Osborn Reproductions.
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kid vishus
Gearhead Posts: 4923
From: middle of NC
Registered: Oct 2000
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posted 12-19-2002 04:00 PM
I thought the only Ford small block that had a steel crank from the factory was the Boss 302?  As for blocks, none are any better than others (as for US blocks are concerned). They all have thin cylinder walls, that's the weak area in all of them, plus they all have the poor oiling system. The four bolt main doesnt add enough (if any) strength to the bottom end to warrant the cost of buying one. A typical 2 bolt main block form a 2v motor is just as strong as any of the other blocks. All of the stock rods with the normal prep work done to them (polished, good bolts, etc) are plenty strong and good to around 8000 rpm (I know this from personel experiance).
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SteveLaRiviere
Administrator Posts: 34763
From: Saco, Maine
Registered: May 99
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posted 12-19-2002 04:03 PM
Right, the Boss 351 didn't have a steel crank.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Be sure to remember our sponsors, Mustangs Plus, NPD, and Osborn Reproductions.
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kewljay223
Gearhead Posts: 263
From: Long Beach, California
Registered: Sep 2002
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posted 12-19-2002 06:05 PM
another block question..... i know that a boss 302 is a 302 with cleveland heads. but i have a friend who said the block was different and that they could be found in a mexican truck in mexico (or something like that). and the cleveland heads, are they 2 or 4v???
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Hemikiller
Gearhead Posts: 404
From: Clinton, CT
Registered: Feb 2002
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posted 12-19-2002 06:48 PM
The Boss 302 was the only Ford SB with a steel crank. The Boss 302 block was 4-bolt mains on 2,3& 4. The "mexican" block is a heavier casting very similar to the 289 HiPo block which had wider main bearing caps. If you put a standard 302 and a Mexican block side by side, the difference is quite obvious. Also, the Mex had two cast in protrusions on the front of the block with no apparent purpose. I have a mexican 302 engine that came out of a 73 Mach 1, so they were installed in cars here in the US. The Boss 302 heads were a close chamber 4-v Cleveland style head with screw in studs and guideplates and a modified water passage for the 302 cooling system with a wet intake. 69's had a 2.21" intake valve, 70's had a 2.19" for "improved" low end response.
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SteveLaRiviere
Administrator Posts: 34763
From: Saco, Maine
Registered: May 99
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posted 12-19-2002 06:52 PM
Also the Boss 302 blocks have screw in freeze plugs, a good way to ID them aside from the casting numbers.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Be sure to remember our sponsors, Mustangs Plus, NPD, and Osborn Reproductions.
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rm302 boss
Moderator Posts: 649
From: Austin Texas
Registered: Dec 2002
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posted 12-19-2002 09:18 PM
quote:
Originally posted by SteveLaRiviere:
Right, the Boss 351 didn't have a steel crank.
Your right i was reading the wrong line. The Boss 351 has a cast iron crank with 90% nodularity... The OFF HIWAY PARTS app book is a little hard to read some times. Sorry for the mis information. Thats sad I have one ove these in my boss car and dont even know some of the specks any more... Mine has a steel crank in it though....
No i do not have the origonal 302 boss motor in my car. Its nice and safe on the engine stand.
rene
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