351c heads on 302 - Forums at Modded Mustangs
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post #1 of 9 Old December 19th, 2010, 12:32 AM Thread Starter
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Question 351c heads on 302

Is it true I can bolt 351c heads onto my 302? What modifications have to be made to do this? Do the years and v's of the heads make a difference? Which ones should I avoid? WHAT ABOUT 351W HEADS? WOULD THEY BE EASIER? I FOUND A SET OFF A 71 FOR $50 whats the deal?

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post #2 of 9 Old December 19th, 2010, 12:49 AM
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Cleveland heads will work but you'll need a intake for it, different headers, notch the pistons or get cleveland specific ones, and I believe some of the waterjacket openings are in different spots. There may be more to it but that's all I remember at the moment. Look up the word clevor for more info if you don't get someone who's done it to reply to the thread.

All windsor heads will work on a 302, the 302 is technically a windsor engine. 351 heads aren't the greatest heads. GT-40s are still the best pushrod windsor head you can get out of the stock parts pile. Cleveland heads are a different story and aren't the poor flowing heads that the windsor ones are.
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post #3 of 9 Old December 19th, 2010, 09:27 AM
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Fogged 306 is right about water passages. the cleveland's waterneck is on the block, not the intake. I think frpp might offer the intake you need. 20 years ago ford motorsports did, anyway. I'm pretty sure the origional boss 302 was a 302w with cleveland heads....So that intake is out there. Good luck finding one, though. The 351w with cleveland heads was called a clevor..... ???? don't know if a 302 version was made??? I've got a friend that has the 351 clevor in his ski boat. Mercruiser made it. That intake won't work as it's the 9.5 deck 's width.

Cheapest way in the long run would be to stick with 302/351w heads..
good luck.

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post #4 of 9 Old December 19th, 2010, 10:10 AM
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Its called a boss 302. A boss 302 is a 302 with cleveland heads. 351w heads on the other hand will bolt right on, with the exception of have 1/2" head bolt holes in the head, if you have this problem with higher hp you will need to get the special washers to fill in the space.

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post #5 of 9 Old December 19th, 2010, 12:27 PM
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Listen to fogged306, search clevor. IIRC back in the day an outfit out of Arkansas made one of the first if not THE first intake to put cleveland heads on a 302 block. You had to drill a couple of steam vent holes into the heads, no big deal thought they provided a template for that and I believe the were like a 3/16" bit. If you're looking to recreate the boss 302 look this is a great way to do it. The water outlet isn't an issue, the intake you'll end up with will have the water neck in the standard 289/302/5.0 location.

All of that being said I have been contemplating just such a creature more to wow the parking lot crowd that wouldn't know better. I wonder though from strictly a performace standpoint with the trove of available 5.0 heads available nowadays, is this a worthy mod on a street performance motor? I'm guessing that due to the huge difference in port sizes that a set of rock stock cleveland heads would outperform an unmassage set of aftermarket 5.0 heads, am I off base here?

Check this link: http://tomsmustangbarn.tripod.com/sbossbuild.htm

Last edited by femurphy77; December 19th, 2010 at 12:31 PM. Reason: found link
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post #6 of 9 Old December 19th, 2010, 12:49 PM
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If you check out the edelbrock site they make intakes for people who want to do a "clevor". They also have cleveland heads that are ready to go onto a windsor. I looked into doing it a bit as it seems like more of a unique way to do things. But from what ive read its not that hard at all to get the stock cleveland heads on.
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post #7 of 9 Old December 19th, 2010, 01:33 PM
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Here's a good read on the subject!

Ford Boss 302 Engine Build - Modified Mustangs & Fords Magazine

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post #8 of 9 Old December 20th, 2010, 01:59 AM
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Originally Posted by 93lxreef View Post
good read

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post #9 of 9 Old December 20th, 2010, 10:14 PM
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If you go with the cleveland heads make sure to find a pair of 4 valve heads and not the 2 valves of possible.
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