Overated BOSS Mustangs?

Unit 5302 · 02-21-2001, 09:10 AM

Okay, so if the 302 and 351C were not semi-hemispherical you wouldn't mind telling me how they got 2.23" and 2.19" intake valves would you? Oh **** ! You can't. Why? You don't have any room on a 4" bore for 2.19" or 2.23" intake valve. You do the math. 2.19" is the same size used on the 427 (2.23" on the tunnel port), which had a much larger bore than the 4" used by the 302 and 351. The 427 had a 4.23" bore. The Boss 302 used 2.23" in 1969, 2.19" in 1970. The 351C used 2.19" on the 4V apps.

As far as the hotter cam, that is totally BS. They were totally different motors, except for the 351C.

I will admit I'm semi unfamiliar with the Boss 351; however, the other two I'm solid on. It's not like I've never read anything on them, thanks. However, I would like to point out that the Cleveland is semi-hemi, thank you very much. Again, can't fit 2.19" intake on a 4" bore, which is what comes on the 4V Cleveland heads. Damn, read your specs again!

The SCJ was a designation given to a engine, like the 428CJ or Boss 429 based on the internals. I believe forged crank had something to do with it. The Boss 429 motor had an SCJ designation from what I've read.

Please, if you don't at least have a somewhat solid base, keep your BS to yourself.

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02-21-2001, 09:10 AM	#12
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Okay, so if the 302 and 351C were not semi-hemispherical you wouldn't mind telling me how they got 2.23" and 2.19" intake valves would you? Oh ** ! You can't. Why? You don't have any room on a 4" bore for 2.19" or 2.23" intake valve. You do the math. 2.19" is the same size used on the 427 (2.23" on the tunnel port), which had a much larger bore than the 4" used by the 302 and 351. The 427 had a 4.23" bore. The Boss 302 used 2.23" in 1969, 2.19" in 1970. The 351C used 2.19" on the 4V apps. As far as the hotter cam, that is totally BS. They were totally different motors, except for the 351C. I will admit I'm semi unfamiliar with the Boss 351; however, the other two I'm solid on. It's not like I've never read anything on them, thanks. However, I would like to point out that the Cleveland is semi-hemi**, thank you very much. Again, can't fit 2.19" intake on a 4" bore, which is what comes on the 4V Cleveland heads. Damn, read your specs again! The SCJ was a designation given to a engine, like the 428CJ or Boss 429 based on the internals. I believe forged crank had something to do with it. The Boss 429 motor had an SCJ designation from what I've read. Please, if you don't at least have a somewhat solid base, keep your BS to yourself.