Engine Heads Question

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67427GT500
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Re: Engine Heads Question

#11

Post by 67427GT500 » 22 Sep 2019, 21:45

I ran the 351 70 D0OE heads on my 1968 289 coupe in high school. Ford offered a special bolt which they called anti-brinelling.
The rockers would be correct on small block but a 289 HIPO and a Boss 302. The pushrod guides are with cast as slots as part of the pushrod hole though the head on 289 HIPOs, as they have mechanical tappets. No need for alarm on the rockers. They are rail rockers for non-adjustable valve trains. The 351 Windsor heads have a 1/2" head bolt hole, the 289 was 7/16" if memory serves me correctly. This is why they required the "special bolts".

-Keith
Last edited by 67427GT500 on 05 Oct 2019, 18:50, edited 1 time in total.
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Re: Engine Heads Question

#12

Post by BossElim69 » 23 Sep 2019, 04:13

67427GT500 wrote:
22 Sep 2019, 21:45
I ran the 351 70 D0OE heads on my 1968 289 coupe in high school. Ford offered a special bolt which the called anti-brinelling.
The rockers would be correct on small block but a 289 HIPO and a Boss 302. The pushrod guides are with cast as slots as part of the pushrod hole though the head on 289 HIPOs, as they have mechanical tappets. No need for alarm on the rockers. They are rail rockers for non-adjustable valve trains. The 351 Windsor heads have a 1/2" head bolt hole, the 289 was 7/16" if memory serves me correctly. This is why they required the "special bolts".

-Keith
Boss 302 didn't have roller tip rocker arms.
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67427GT500
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Re: Engine Heads Question

#13

Post by 67427GT500 » 23 Sep 2019, 10:24

BossElim69 wrote:
23 Sep 2019, 04:13
67427GT500 wrote:
22 Sep 2019, 21:45
I ran the 351 70 D0OE heads on my 1968 289 coupe in high school. Ford offered a special bolt which the called anti-brinelling.
The rockers would be correct on small block but a 289 HIPO and a Boss 302. The pushrod guides are with cast as slots as part of the pushrod hole though the head on 289 HIPOs, as they have mechanical tappets. No need for alarm on the rockers. They are rail rockers for non-adjustable valve trains. The 351 Windsor heads have a 1/2" head bolt hole, the 289 was 7/16" if memory serves me correctly. This is why they required the "special bolts".

-Keith
Boss 302 didn't have roller tip rocker arms.
Your Boss isn't a Windsor, it's in the Cleveland family. I also said RAIL, not roller. The OP's post was clearly on a 221-302 Windsor small block. Your Boss is also a mechanical valve train which has guide plates to control push-rod location, as should the OP's roller rockers.
-Keith
Last edited by 67427GT500 on 23 Sep 2019, 11:35, edited 1 time in total.
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Re: Engine Heads Question

#14

Post by 70b302cat » 23 Sep 2019, 11:22

67427GT500 wrote:
23 Sep 2019, 10:24
BossElim69 wrote:
23 Sep 2019, 04:13
67427GT500 wrote:
22 Sep 2019, 21:45
I ran the 351 70 D0OE heads on my 1968 289 coupe in high school. Ford offered a special bolt which the called anti-brinelling.
The rockers would be correct on small block but a 289 HIPO and a Boss 302. The pushrod guides are with cast as slots as part of the pushrod hole though the head on 289 HIPOs, as they have mechanical tappets. No need for alarm on the rockers. They are rail rockers for non-adjustable valve trains. The 351 Windsor heads have a 1/2" head bolt hole, the 289 was 7/16" if memory serves me correctly. This is why they required the "special bolts".

-Keith
Boss 302 didn't have roller tip rocker arms.
Your Boss isn't a Windsor, it's in the Cleveland family. I also said RAIL, not roller. The OP's post was clearly on a 221-302 Windsor small block. Your Boss is also a mechanical valve train which has guide plates to control push-rod location..
-Keith
My understanding is that the BOSS 302 block is a member of the Windsor family with heads derived from the 335 family (Cleveland/Modified).

You can take a "normal" 302 Windsor short block and bolt all of the "other" parts from a BOSS 302 onto it with minimal issues. You can not take a "Cleveland" short block and bolt the "other" parts from a BOSS 302 onto it without many modifications.

"other" refers to heads, intake and exhaust manifolds and other components that are different between normal definitions of "short" and "long" blocks.
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Re: Engine Heads Question

#15

Post by xr7g428 » 23 Sep 2019, 11:33

Interestingly enough the Boss 302 came out before the Cleveland 351. You could say the Cleveland was developed to use the Boss 302 heads. (Not exactly true but I think my point is in there some where).
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Re: Engine Heads Question

#16

Post by CougarJoe22 » 23 Sep 2019, 15:46

Here are some more pics of the engine as is. I'm trying to decide if I should rebuild this or go with a turn key crate engine. I have no idea what HP this is putting out as is but would like 300 to 350hp. This engine runs great but it leaks oil pretty bad and smokes a bit on startup. I think it runs really rich. I'm sure headers would help quite a bit. What do you guys think?





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Re: Engine Heads Question

#17

Post by Steve68Cougar » 30 Sep 2019, 19:38

It looks like a 289/302 by the width of the intake manifold. No way of telling displacement without measuring the stroke. It looks like a pretty standard 600cfm vacuum secondary Holley. I have Hedman headers on mine and have been happy with them. Some people don't like long tube headers because they typically call for a power steering relocation bracket and the power steering hoses get awfully close to them. If you haven't checked the float levels on the carburetor you might consider doing that. I'm sure there are lots of videos out there if you're not familiar with the process. I doubt you're at the 300hp level unless it's been stroked to a larger displacement and has a decent cam in it. A new crate engine with aftermarket aluminum heads would definitely get you to the hp level you're wanting.

As someone mentioned, a Boss 302 is essentially a Windsor block with Cleveland heads. I know of people that did a "Clevor" version of a 302 back in the '70's and '80's before they made good aftermarket heads for the Windsors. The Cleveland heads essentially bolt onto the Windsor block, but require a bit of rework on the water passages and a few other things. There are some articles out there that explain what all it takes. At this point it's way easier to just get some aftermarket heads and be done with it.
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Re: Engine Heads Question

#18

Post by 67427GT500 » 05 Oct 2019, 18:57

No, but we can ascertain by the intake that it's not a 351 Windsor because of width. Everything interchanges on the 289-302 but the crank. The stroke on the 302 is about 1/16 longer.
The common swap was the early 351W heads in the late 70's early 80's. It was popular enough that Ford offered the special head bolts through their parts division. The Cleveland head swap was more difficult as it required coolant passage changes. The Boss 302 parts were bolt-on.
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Re: Engine Heads Question

#19

Post by Royce » 05 Oct 2019, 22:29

Actually the head bolts recommended by Ford For installing the 351W heads on 289 / 302 engines was the factory set of Boss 302 bolts.
67427GT500 wrote:
05 Oct 2019, 18:57
No, but we can ascertain by the intake that it's not a 351 Windsor because of width. Everything interchanges on the 289-302 but the crank. The stroke on the 302 is about 1/16 longer.
The common swap was the early 351W heads in the late 70's early 80's. It was popular enough that Ford offered the special head bolts through their parts division. The Cleveland head swap was more difficult as it required coolant passage changes. The Boss 302 parts were bolt-on.
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