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Discussion Starter · #1 ·
I've decided against the '69 windsor heads and have now found a great deal on a set of 351C 2v heads. They have already been machined to fit on a windsor block. Does anyone know what mods are necessary to make these work? Do i run a cleveland intake? Do i need to worry about valve clearance? By the way I'm working w/ a stock 67 c code w/ 3 spd man. Any idea what sort of compression ratio i would be looking at? Would i have o geta different set of headers to fit as well?
Thanks.
 

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Man are you looking for trouble.....What you are talking about is a "Clevlor" You need a special intake, and new exhaust.
What you are talking about is a poor man's Boss 302...
The intake was made years ago, then they quit making it....I heard there is 1 company that is making it again, but, can't remember who....
I ave read about the combo, but, can't remember what all has to bee done. I think some water passages in the block have to be closed off, and I think maybe some special pistons for valve clearance......
I would advise you to stay with the 351 heads, or, for the cash outlay on this swap, I woud buy aluminuim heads......
 

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Also the compression is going to go into the dumper big time! IIRC, they have a chamber size of about 71CC's. Off hand, this'll be good for close to a 2 point drop if I'm right. Didn't bother doing the math,but about 10CC's of a 289 is good for about 1 point.
 

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You could use a Boss 302 intake but the port mismatch would hurt performance. There is a special intake made for this conversion called the Street Boss, don't recall any other details.

Your compression ratio with stock flat top pistons and open chamber Cleveland heads would be around 8.0 to 1. The Aussie heads are closed chamber and would work much better on a 302, giving around 9.0 to 1 compression.
 

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My understanding is that you can't put a 351C intake on a 289, it's too big. What you have to do is use a 289 manifold with the 351 heads. That's why everyone uses 351W on a 289. With a 351C you need a 351C manifold because the water passages are different and as we just discussed a 351C manifold won't fot a 289 block....so I believe you either have to stick with 289 heads (higher compression and oversize the valves) or go with the 351W heads (lower compression and oversized valves). I also think both the intake and exhaust passages on a 351W are the same size as the 289? So really all you are getting is larger intake valves but lower compression.

I was recommended to stick with 289 heads for the natural higher compression and to oversize the valves and port the exhaust chamber. Now that's a nice cheap set of heads that you know will work.


Just my 2 cents....Greg.
 

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Everything you wanted to know is here. The company they list that makes the intake is out of business. There is a company that is based in oklahoma that bought the manufacturing equipment. The intake is about $400. Here is some more info including prices for required parts.
 
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Discussion Starter · #9 ·
If you're just looking for the highest flowing heads for your small block check out these bolt-on 32-valve Heads I came across an auction they had for these on ehay, starting bid was around $3000.00/pr.
 

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From the performance number they have, you would get better power with a .030 over, stock stroked 302 with Roush Winsor Heads and moderate cam.

Why go though the trouble of all that work when you can buy off the shelf part. I am for "easire" - there are less headaches down the road.
 

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Even if you could get a set of ready-to-run 335 2V heads for free, by the time you are done marrying them to the block, getting decent compression and attaching an intake and headers, you'll be dollars and head hairs ahead by just buying a set of AFR's, TFS's or Edelbrocks and bolting them on...

Trust me...
 
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