bxershrts

Cleavland heads or "Boss" heads per se' on a 302 or 1966-1969 302 "quench" small chamber heads. Can these heads still make hp like todays twisted wedge afr and such? Is it just old technology? The chamber design on the late 60's heads is similar to the naked eye but how much difference is there internally and with flow? ANy ideas?

nitrous_bob

DOOE's ('69-'70 windsor castings) are GT-40's , thats what gt-40's are made from.

BUT, the those old windsor heads do not have hardened valve seats, so your gonna spend a couple bucks replacing them, by the time you do that, depending what other machine work needs done, you might a set of fz3e's ('93/'95 cobra) and start off cheaper for the same thing

expect to pay $100 for a set of DOOE's
expect to pay $300 for gt40's

NOT "p" HEADS !!!!!! real gt40's , unless they are $100 / set stay away from the p's

ih8chevy

yea man they are some of the best flowing heads ford or any non hemi heads ever produced. I have seen plenty of instances with those heads and a relaticvely mild cam like 530-55- lift make well over 500 hp with a good carb they really flow well better than afr i would say, the prob is u gotta port them out really far and u will have one nasty motor, just get a carb to match,

bxershrts

So are you talking about the late 60's 302 heads? Or the 351 Cleveland heads?

ih8chevy

well if u are talking about hte boss heads and the clevelands are the same thing, if u want to put them on ur windsor dont
it takes way too much work
the late 60's 302 heads are the same that are on the 87-94 mustangs
the boss heads were different
and yea the clevelands were the ones i had seen make well over 500 hp
noone wants to do that to a boss motor u dont need it they already make 300+ so and they are so rare

bxershrts

i am aware that boss and cleveland are the same and that it comes from the 351 head being matched to another motor wether it be 302 -460. Just wanted to know if the high flowing heads that out performed the afr's were 351 (boss/cleveland) heads or the late 60's 302 heads? From my experience the heads from the late 60's are not similar in design at all the the 87-93 heads. This is what I have seen from my experience of rebuilding these engines.

The first pics are the small chanber quench head of the late 60's.

http://cgi.ebay.com/ebaymotors/1969-...QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/69-30...49431995QQrdZ1

Here is the 87-93 mustang head. They are open design and lower compression.
http://cgi.ebay.com/ebaymotors/Musta...51718492QQrdZ1

How are these heads similar, they are nothing alike?

ih8chevy

what late 60's 302 heads are u talkin then b/c the base 302 that replaced the 289 has not changed from what i am told, maybe u mean some other 302 like the hipo or the one put in the gt 350 mustang or something else but the base 210 hp 302 from the 1967 had the same heads from what i have been told

but ur best bet would be 351 clevelands

also depending on what u want hte 2 barrel closed chamber heads will be ur best bet for a street motor cause the of the smaller exhaust port,

and the 4 barrel open chamber heads will be good for top end because of the gigantic exhasut port those are the ones i saw make over 500 hp

bxershrts

I have a few 289 blocks that arent HiPo. The heads are similar design (visually) from 1966-1969 on the 302 and 289 blocks. So that is proablay true that they kept the same heads from the 289 onto the 302. The combustion chamber on the 1966-1969 289-302 heads are very similar to the AFR, Trick Flow, Edelbrock, heads or heads of today with "quench" , "Swirl" small combustion chambers. The 302 GT "stock" mustang heads of today 87-93 are not similar To a GT-40 Head or 1966-69, 289-302. They have open chambers. From what I have seen rebuilding the blocks. 1987-1993 mustang heads "do not" have small, closed chamber heads. Are nothing like GT-40 Heads. So from what I have seen, that (certain years) of the 87-93 heads are like the GT-40 heads..is not true.

I just wanted to know if the 302/289 heads from 1966-1969 are as good as the AFR, Trick Flow, Edelbrock heads of today. They all have that same "quench" small chamber "swirl" design. Regardless or hardened valve seats...... do those old heads flow and make power just as the new heads do? Has anyone has experience with them.