I have a question. Has anyone here ever modified a 351m head to fit on a 302 block. A few years ago a mustang mag had a article in it where they did this. They bought a special made intake from I think B and A performance over by Fort Smith Ark. And I even went to B and A shop to buy an intake about 10 years ago but they were out of the single plane model that I wanted so I put the project on hold . Well now its been on hold long enough and I have since lost the mag article, tech tips, and B and A s address. Does anyone have any of this info, or any info pertaining to retrofitting a set of 351m head to a 302. Now for my next question. How tight do you think it would be putting this combo in a Maverick?
The 351m heads are basically the same as the 351c heads. But since the 351m heads are later they may have smaller valves. B and A is gone but according to article in the below link Bush Performance Engines has the rights now. Check this link for details on the swap http://www.mustangandfords.com/techarticles/30220/ Do a internet search for Frod Clevor
i would doubt that the combo will give you any fitting problems until you try to find a set of headers for it. headers for a maverick are kind of tight in the first place, but the ones that will fit a 351m, and i'm not really familiar with it, are probably non existent to fit in a mav so you'll probably have to have them made. good luck if you try it.
The article should tell you most everything... although they do push Bush pretty hard, like a commercial. The combo in a Maverick will be fairly tight, but not as bad as a 351 W or C. The 351s fit without notching the towers if you take pleasure in frustration, so the Boss 302 clone should do fine. I mocked some Cleveland heads onto my 302 one time, just before installing a Cleveland, and there seemed to be good space for it. You will need swap headers... Tubular Automotive makes them for the 4v heads, I am sure one call to them could get you a special order 2v set. I had a B302 set from them at one time... they are awesome. The article may have touched on these, but I will anyway... The piston will be any Boss 302 piston, although stock replacements might be too aggressive for street use, plus the chambers are different. The pushrods are, again, B302 part numbers. The rods must be changed to 289 parts if you run B302 pistons. M heads have a water crossover on the intake face. I don't know if this lines up with a W style intake crossover, but if it did, you would save having to drill it. If it doesn't line up, it just might interfere with the hole you do need... M heads have the same open chamber of the 2v Cs, it is large and prone to detonation. Personally, I would not run over 9:1 compression with this head. That's okay though, you will have trouble getting over that with the size of the chamber. Good luck, let us know how it turns out! Dave
Without going into the related link to actually find out, aren't the head bolts a larger diameter on a 351? ??? maybe?? perhaps?? no??
Try this link: http://www.jason.fletcher.net/tech/cleveland2v/cleveland2v.htmyou can use the cleveland heads with standard 302 pistons if you stay under about .480 lift! You have to buy a special set of head bolts
I'm currently working on this set up for my new car. The cleveland and the modified heads are the same, they have the same 2.05" intake valve and 1.67" exhaust. There is some machining that is required to make them fit. Two water ports on the head face need to be machined for a freeze plug and a hole needs to be machined for the intake. Speed pro makes hypertectic pistons for this mod I have the part number at work I will post if you want. These are 9/1 and they use stock 5.09 302 rods, and are avalible from summit at a reasonable price. The intake is about the most expensive piece. I got my B&A street boss from e-bay for around $400. There is a company that makes adapters to use regular 302 intakes with these heads I think they were called Performance machine. If I remember right they cost around $285 for the adapter plus the cost of the intake. Headers....well I made my own, I don't have shock towers to worrie about. I can say this 4v headers will not fit, the ports are to big they will leak. It would be cheaper and easier to get a good set of 5.0 heads, I'm doing it for engine compartment shock value
That is actually a very good question... I have contemplated this mod for years, but never thought twice about head bolts, but only because B302 bolts and stud sets are available aftermarket, like ARP. I always just figured I would use ARP and never thought about interchanging stock bolts. I guess, even after thinking about it for the first time, I would still just use ARP bolts or studs anyway... Just get B302 parts and you know you are right. Dave
It was price motorsports for the intake here is the link http://www.pricemotorsport.com/Intake_Adapters/AP-24/ap-24.html I'm using boss 302 head stud kit from ARP
Oooops wrong block here's the right one http://www.pricemotorsport.com/Intake_Adapters/AP-09/ap-09.html
For some info go to the the Ford Motor Sports catalog about page 120. The heads need the square holes drilled .800 and tapped, plugged and some small holes drilled on the intake face. Use Cleveland gaskets and the special intake. This is not totally a bolt on swap.
Weiand made some adapters at one time. They had them for SBF intakes on W engines, and SBF intakes on B302 type conversions. They also made, at one time, a tunnel ram for W/C head swaps. I always liked the idea of a tunnel ram with a single 4 carb on a small plenum. (lots of torque and super wide power range) Offy makes similar parts too, but I don't recall anything for 2v heads. With them it's all about the 4v heads on their B302 intakes. The 4v intake will fit the 2v heads, but it is a bad port mis-match. If you are not careful with the gaskets, you could also end up with an internal vacuum leak. The bottom of the port does not have much sealing surface. It does work though, been there... done that (a long time ago). Check and see if the water passages on the M head line up with the passages on the 302 intake. I have been wondering this for years... Dave
Hey fordman My dealings with 351 m heads are that they make good boat anchors, most engine builders i know told me to throw mine away. so i did. get a good set of 351 c heads. the 2 v heads are the best for flow.
How are the M heads worse than 2v heads? They are basically the same. The M heads will have hardended valve seats, unlike most C parts. The M heads have a water port in the intake for some emission related reason, this might actually help a swap though. The M heads have the same, terrible IMO, chamber. Same valves, same ports... Just curious what reason your mentor gave... Dave
With the availability and pricing of aftermarket heads these days, seems to me that it'd be money ahead to use a windsor style aftermarket head and off-the-shelf pistons, intake, and headers. If you really wanted to be different, go with 4V cleveland heads or Aussie heads that are found on Ebay. Those are the only 2 C heads that I believe I'd even mess with. The others aren't worth the time/money/trouble, IMO.
