need to know what type of engine

mustang66teen · 07-27-2001, 07:23 PM

hi i have a 1966 mustang and i am about to rebuild the engine and i think it is a 302, but just to sure i got the block number but i have no clue how to read it the number is 3E25, what is it a 302 or 289

Gearhead999 · 07-28-2001, 02:05 PM

That number looks like a production date number. Like May 25, 1973, the casting number is near the starter and should start with a letter. Like "C", "D", etc.

Early 66 had only 5 bellhousing bolts. All 302's have 6. Also, I know this is the heads, but, 289 is cast in the heads under the valve covers and the heads should have a straight shaft for the rockers, not shouldered.

07-27-2001, 07:23 PM	#1
mustang66teen Registered Member Join Date: May 2001 Location: dunkirk, MD . USA Posts: 11	need to know what type of engine hi i have a 1966 mustang and i am about to rebuild the engine and i think it is a 302, but just to sure i got the block number but i have no clue how to read it the number is 3E25, what is it a 302 or 289

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07-28-2001, 02:05 PM	#2
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	That number looks like a production date number. Like May 25, 1973, the casting number is near the starter and should start with a letter. Like "C", "D", etc. Early 66 had only 5 bellhousing bolts. All 302's have 6. Also, I know this is the heads, but, 289 is cast in the heads under the valve covers and the heads should have a straight shaft for the rockers, not shouldered.