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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

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Old 11-14-2010, 08:05 AM
the Canadian the Canadian is offline
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351 heads

i am building a 302 for my 72 f-100 i have a chance to put 351 heads on the 302 can anyone tell me what i will need to do this job and what would be the advantages if any thanks.
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Old 11-14-2010, 09:46 AM
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From what I know, you'd probably need to re-do the pistons, bore and rings to give you the performance to match the slightly beefier heads of the 351. I just re-did my stock 302 heads-had a valve job done at a high end machine shop and they are amazing. There were several 302 head designs...specifically, the combust. chamber area. The later ones, beginning around '73 or so have a different design, small comb. chamber and from what I understand, they have higher compression as a result. Which ones do you have? They were designed for better fuel economy. Might be worth staying stock and rebuilding your 302's.??
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Old 11-14-2010, 10:17 AM
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351 heads

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From what I know, you'd probably need to re-do the pistons, bore and rings to give you the performance to match the slightly beefier heads of the 351. I just re-did my stock 302 heads-had a valve job done at a high end machine shop and they are amazing. There were several 302 head designs...specifically, the combust. chamber area. The later ones, beginning around '73 or so have a different design, small comb. chamber and from what I understand, they have higher compression as a result. Which ones do you have? They were designed for better fuel economy. Might be worth staying stock and rebuilding your 302's.??
Thanks for the advice. my block is 30 over with flat top pistons i am doing all new rings bearings cam intake carb headers thats about it. i have two sets of heads the original 72 with rail type rockers and a set of 78 heads with the boss style rockers. can you tell me what the rocker arm ratio is on stock sbf heads and what heads do you think i should use the 72s or the 78s or the 351s. thanks.
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Old 11-14-2010, 11:33 AM
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The heads will bolt on with no issues.The rocker arms should be the same after 1969 Ford made them all that you just torque them down and your done.Before 69 they were like a Chevy where you had to adjust them while the engine was running.The best heads were the 1970 4v heads I think they where 63 cc chambers.
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Old 11-14-2010, 12:16 PM
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Just out of curiosity, are your heads the Windsor style, or the Cleveland style? They are both good swaps, but the Cleveland heads would require special intake and exhaust.
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Old 11-14-2010, 03:55 PM
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I think the later heads would probably be best. Mine are the later type where you simply torque down the rocker bolts....so much easier and less hassle. Are you doing a valve job? If so, I'd just stick with the stock 302's...besides, you have headers, that should be enough with all the other stuff you've done to bring the engine alive.
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Old 11-14-2010, 04:10 PM
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What condition are the 351 heads? Do you have casting numbers off them?

Check the SBF forums, Conanski has a handle on all things SBF and some 351w heads are terrible.

There are 302 heads off Explorers that are better, and if you have to put money into these heads, best check some threads there first, or post there for more info. But have those numbers first.

351w head on a 302 used to be the way to go--30 years ago. Not necessarily the hot set up now.
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Old 11-15-2010, 10:03 PM
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351 heads

Thanks everyone I will get back to you soon with more info.
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Old 11-15-2010, 10:22 PM
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cleveland/windsor?

If a cleveland need to change pistons for canted valve. Intake modification also on cleveland design. If just a windsor not a big change but believe the combustion chamber is bigger in stock form. I prefer the cleveland design due to better airflow due to better design. but their are tricks for the clevor motor when assembling. Old dirt track set up back in the day. it works well but keeping with the non canted valve design is better for simplicity. so what is you application is the big question??????
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Old 11-15-2010, 11:39 PM
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If this is 351W heads then they have bigger head bolts and require a bushing to be installed in the bolt hole in the heads to adapt it down to the smaller bolt.

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Old 11-16-2010, 12:00 AM
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Quote:
Originally Posted by the Canadian View Post
i have two sets of heads the original 72 with rail type rockers and a set of 78 heads with the boss style rockers. can you tell me what the rocker arm ratio is on stock sbf heads and what heads do you think i should use the 72s or the 78s or the 351s.
Stock rocker ratio for SBF is 1.6.
'78 was the smog era so those heads are complete junk.. hugh combustion chambers and small valves. What is the casting number on your 351 heads? Early 351 heads are better than most others but that's not saying much as even those require porting to make what I'd call respectable HP.. like 300+. Late model GT40's and the aftermarket is where you should be looking if you want performance worthy of the displacement.
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Old 11-16-2010, 12:00 AM
 
 
 
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