351 Cleveland to a 351 Boss

[bry23]

I found and old 1970 351 Cleveland 4 barrel engine and now i am in the middle of rebuilding it when i wondered if there was a way to convert it from a regular cleveland to a boss. does any body know if it is possible

[duplox]

Originally Posted by bry23

I found and old 1970 351 Cleveland 4 barrel engine and now i am in the middle of rebuilding it when i wondered if there was a way to convert it from a regular cleveland to a boss. does any body know if it is possible

There isn't much that is different. The only way you could tell from the outside would be the D1ZX casting number on the intake. The Boss heads are just normal 351c 4v closed chamber heads with the heads milled for adjustable rockers. Your standard cleveland head rebuild involves milling the pedistals for adjustable roller rockers anyways, so its really nothing special. All the differences that I know of is a different cam, maybe different pistons(probably forged, possibly domed), the aforementioned head difference, different intake(squarebore 4bbl intake... might be aluminum, don't remember), carb, etc. Unless you're putting the engine in a show Boss 351, theres no reason to try to use Boss parts. Lots of money for Boss stuff. You could easily get a streetable 475-550bhp out of a cleveland without boost or juice. Let me know if you want to hear some good combos.

[JFraley]

Originally Posted by duplox

There isn't much that is different. The only way you could tell from the outside would be the D1ZX casting number on the intake. The Boss heads are just normal 351c 4v closed chamber heads with the heads milled for adjustable rockers. Your standard cleveland head rebuild involves milling the pedistals for adjustable roller rockers anyways, so its really nothing special. All the differences that I know of is a different cam, maybe different pistons(probably forged, possibly domed), the aforementioned head difference, different intake(squarebore 4bbl intake... might be aluminum, don't remember), carb, etc. Unless you're putting the engine in a show Boss 351, theres no reason to try to use Boss parts. Lots of money for Boss stuff. You could easily get a streetable 475-550bhp out of a cleveland without boost or juice. Let me know if you want to hear some good combos.

I have a 73 with a 351 cleveland 4v heads and would love to hear some good combos!. As far as the inside of the engine pistons, cam i dont know what it has i just bought it from a guy that purchased it at a auction. It has a holley 4150 750cfm carb, 351 torker intake, headers. Anyway sorry for jumping into your thread to ask Q's but i would love to hear some combo's!.

[smokin' joe]

I am 16 and i drive a 1970 mustang with a 351 cleveland that is at the very high 300hp range.
bored 30 over
balanced and blue printed
polished crank
flat top pistons
shot peened rods
lunati 520 lift cam
weiand intake
ported and polished heads
roller rockers
hooker headers
weiand water pump
electronic fuel pump
mallory electronic ignition
770cfm holly street Avenger carb.
3500 stall converter
3:55 spooled

and some other stuff like line lok (FUN FUN)
any other suggestions please send
P.S it runs 12.40

[duplox]

Tell me the goals you have for the car; ET or HP goals, pure street, street/strip, strip. If it'll see street duty, it'd help to know exactly what you consider 'streetable' to be. Some people don't like anything more than a rough 750rpm idle and power comin in at 2500rpm, some don't mind 1000 and 4000-7500 powerband. Specs on the rest of the vehicle(transmission, rear end, weight, etc) are essential.