is there a 351 Cobra Jet?

clutch5oh · 10-14-2003

a friend of mine just bought a 73 or 72 mach 1. and they were convincing me that it had a 351 clevland cobra jet? is there such a motor? i thought the cobra jet was a 427? is he just talking out of his behind or does this exist? i know there is a 427 cobra jet but is there a 351 cobra jet too?

Twister · 10-14-2003

Ford in the 1970's called all of their hi-po engines a BOSS or a Cobra-Jet.

there was a 428 Cobra Jet (1968-70), a 429 Cobra Jet (1970-72) and a 351 Cobra Jet (72-3)

There was no 427 Cobra Jet

clutch5oh · 10-15-2003

thanks for the info

Kaylah · 10-17-2003

Definitely!

Here are the 351-Cleveland engine variants (all from 1969-1974):

1969 - Boss 302 (Technically a Windsor)
1970-1971 - Boss 302 (for half a year), 351-4bbl, 351-2bbl, Boss 351 (the best), 351-CJ (CobraJet), 351-2bbl Aussie, and 302-2bbl Cleveland (Australia only)
1972-1974 - 351-Cleveland HO (High Output), 351-CJ (CobraJet) -- these two were the only 4bbl Clevelands -- 351-2bbl, and I think they made the 302 and 351 CLeveland Aussies (Australian) until '73

From 1972 onward, the 351-CJ was the preferred Cleveland engine in the states. In 1970-1971, the Boss 351 ruled!

krankieone · 10-19-2003

Quote:

Originally posted by Kaylah
I think they made the 302 and 351 CLeveland Aussies (Australian) until '73

If I remember corectly the last Aussie model with a Cleveland V8 was the XD Falcon about 1980

672000 · 03-13-2008

I've identified the long block I bought recently as a 72 351 Cobra Jet block. D2AE-CA there are some unusual things about this engine- cast into the Valley in all 4 corners it has X X X and then underneath that YYVVYY (all corners have the X's, the YYVVYY varies with Y VVYY) not stamped, they are raised castings. I pulled the heads which are 75 Cleveland 2bbl heads to see what I had inside. I've never seen a set of pistons like these- not flat tops or dome tops, appearance is of a circle within a circle- outer circle is raised about 1/4 inch from the inner circle, there are 2 ramps 180 degrees apart cut in a spiral pattern, one side of each ramp at the height of the upper/outer circle then ramped down to the depth of the center circle. the deeper sides are not both on the same side of the chamber- if you went in a circle around the piston top counter-clockwise the ramps would go from upper to lower level, then again from upper to lower level. seems to me the purpose would be to create swirl in the cylinder the way they're designed. don't know if any of this makes sense, but I can provide pix if you think you know what I have here. would appreciate any input you can provide- Thanks!

andrewmp6 · 03-13-2008

Yes 427 had 3 different ones the sohc the top oiler and side oiler.The 428 was a cobra jet and super cobra jet.The 351 cj was made May 1971-1974 280hp in 71/72 73 it dropped to 246hp.

672000 · 03-14-2008

a friend of mine tells me these pistons are designed to be usable on either bank of the engine and that the lowered section in the middle is to drop the compression for the 2bbl heads. makes sense to me. still looking to find out about the X's and Y's cast into the corners of the valley. Thanks!