289 heads

fender leo · 08-14-2007, 08:24 AM

are the heads from a 289 2bbl the same as 4bbl heads?
putting a 4bbl intake and carb on a 289 that was a 2bbl, will it perform the same as an original 4bbl?

bmxmon · 08-15-2007, 05:13 AM

I did a little research and the only thing I found was that the heads between a "standard" and hi-po 289 were different. So between the regular 2 and 4bbl I would assume no. Will it perform the same? No, compression ratio was lower on the 2bbl's stock, so assuming the heads are the same it has to be different pistons for a lower C/R. Also, taking into account that your engine is now 40+ yrs old, its got some wear in it, unless your going through the entire engine. Your definitely on the right track with the upgrades, im sure you'll enjoy it! What intake are you swapping too?

TEXAStang19 · 08-04-2008, 01:42 AM

As far as I know the Hi-Po is the only 289 head variation with its solid lifters. 2v and 4v heads should be the same.

hdizzle · 05-23-2009, 10:08 AM

The heads are the same. there is no difference.

08-14-2007, 08:24 AM	#1
fender leo Registered Member Join Date: Aug 2007 Location: ontario Posts: 19	289 heads are the heads from a 289 2bbl the same as 4bbl heads? putting a 4bbl intake and carb on a 289 that was a 2bbl, will it perform the same as an original 4bbl?

08-15-2007, 05:13 AM	#2
bmxmon Registered Member Join Date: Mar 2004 Location: Minnesota Posts: 950	Re: 289 heads I did a little research and the only thing I found was that the heads between a "standard" and hi-po 289 were different. So between the regular 2 and 4bbl I would assume no. Will it perform the same? No, compression ratio was lower on the 2bbl's stock, so assuming the heads are the same it has to be different pistons for a lower C/R. Also, taking into account that your engine is now 40+ yrs old, its got some wear in it, unless your going through the entire engine. Your definitely on the right track with the upgrades, im sure you'll enjoy it! What intake are you swapping too? __________________ Alex

08-04-2008, 01:42 AM	#3
TEXAStang19 67 Mustang Coupe Join Date: Aug 2008 Location: Fort Worth, Tx Posts: 1	Re: 289 heads As far as I know the Hi-Po is the only 289 head variation with its solid lifters. 2v and 4v heads should be the same.

05-23-2009, 10:08 AM	#4
hdizzle Registered Member Join Date: May 2009 Posts: 1	Re: 289 heads The heads are the same. there is no difference.

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