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• 351w

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Total Members Voted: 1

[Texaspitbull]

VOTE & LET ME KNOW...

what's better to run on an 306 carb motor. the 289 heads for comp ratio or the 351w heads for tq?
what will give me more power.
anyone? help I need info......ill be running 750DP carb. c4 trans 200 nos

[Soaring]

I will assume you mean a 302 motor, and not a 306. The head bolts are larger diameter on the 351 W heads vs your 289/302 block - in addition to the other options, you can also by a head bolt kit through summit (1/2 inch diameter non-threaded part, 7/16" diameter threaded part).
 351W heads will outflow your stock(?) 289/302 heads but your 289 heads have smaller conbustion chambers for increased compression. Basically, with a direct swap you probably will not notice a significant power gain between the two.
 You can mill the 351 W (0.01 inches I believe) to decrease the combustion chamber volume to about 59cc's - this should put you at about 10:1 compresison with stock pistons (similar to where you are with the 289 heads). Also, you can do some porting to enahnce performance.

You are better off just buying a good set of aftermarket heads rather than pay someone to port, shave your 351 W (not to mention screw in studs, guides, etc). If you are on a budget and interested in home porting I would just home port your 289 heads. You can fairly easily make them flow like the windsors plus you benfit from the smaller combustion chambers. Or if you can find a set of ported, milled 351 W for a fair price that is another budget way to go.
Or just swap what you have and see for yourself. Thats part of the fun.
Regarding Hp gain, I would expect about 30-40 with a moderate port job on your 289 heads.

[rmodel65]

if your going cheap on the heads get the gt40s from a cobra or a 96-97 explorer and mill them they are basically 351w heads but have hardened valve seats and flow a little more plus you will not need the adapter washers that the 351 heads require



also the only 351 heads that are a gain are the ones with a casting of C9 or DO which = 1969 and 1970

i would also say you are way over carbed id keep it closer to 600cfm

[Soaring]

No 351 heads in 1965 Steve.  Yeah, I forgot about the gt40 heads.  I wonder what a set would run you in a junk yard?

[rmodel65]

yeah it was a typo meant 1969 i fixed it

[Texaspitbull]

Thanks guys. I found a pair of 1963 hipo 289 heads 49cc Ill have them ported & use them I think...

[Soaring]

If you found a 1963 set of Hipo heads with a 49 cc combustion chamber, then you may have found a very rare prototype set of heads.  Read this, then get back with us to confirm what you have. 
http://www.fordsmallblock.com/PDF/Prototype-1965-HiPo.pdf

[Texaspitbull]

Engine Carb. Chamber- 1963 Hi-Perf 4V
Vol. Intake - 49.2cc
Valve Dia. Exhaust -1.67"
Valve Dia. Intake - 1.45"
Port Dia. Exhaust - 1.94 x 1.04"
Port Dia. 1.24x 0.96"

is what I was told?
do u know anything about these heads.

[Soaring]

Read the URL  I gave you and decide for yourself.  I think they are pretty rare heads. 

[66GTKFB]

The only thing that counts for true 1963 HP heads is the part numbers: 1963 HP heads are marked COE-E and C3OE-F. Both, as well as all 289 HP heads, use threaded in studs for the rockers and special spring seats. You can modify heads to incorporate the threaded studs and seats - and then machine them to increase compression. They function about the same but don't have the value.
Jim

[Texaspitbull]

Thanks for the info...