Hello all, gonna pick yer brains a bit if I can. I have a 79 F150 I am restoring,(pics to come later) and It has the original, unmolested 351m in it. Right now, it's a boat anchor and I was wanting some input from more experienced folks on how to wake that puppy up WITHOUT dumping thousands of dollars into it. It has a miserable 2 barrel on it and I know can get a 4 barrel intake and carb for it but, what else can I do? Read a tech article and it said the 400 and the 351 are identical except for crank and pistons. Can I put a crank and pistons from a 400 in my 351? Help me out folks. Thanks.

351m

I read that the 351m has taller heads than the 400. Making the push rods longer. I have the same engine. 79 also. Will be interested in what you hear. I have Edelbrock intake and 4brl. Was told to go with electric fan. I'd wondered why not use 400 heads and cam it? This its my first project. 79' f250 custom/hd option.

Anyone know how to locate the pics I just uploaded? I uploaded 5 or 6 of them but then I go to my pics, no where to be found. Any thoughts?

Am inserting these pics because I was doing the water pump and saw this plate. I noticed the holes look to be modified and was wondering if any one had thoughts on this as well.

The only difference is the crank and pistons.

The pistons have the wrist pin holes on a different location

The push rods are the same as the 400.

http://www.projectbronco.com/Technical_Articles/351m400_performance_build_up.htm

Mil1ion said:

The only difference is the crank and pistons.

The pistons have the wrist pin holes on a different location

The push rods are the same as the 400.

http://www.projectbronco.com/Technical_Articles/351m400_performance_build_up.htm

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OK, so, from what I read, I can actually make my 351 into a 408 with out breaking my bank. NICE!!! LOL

That is common, same for a 360 and 390. You technically can also make a 428 out of a 390, but it is a bit more involved... But yes, the base block and heads are the same.

79fordtrck said:

OK, so, from what I read, I can actually make my 351 into a 408 with out breaking my bank. NICE!!! LOL

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They will respond like any other engine...straight up timing gears, cam, headers, intake and carb will get you some respectable numbers. The heads are the the one thing that holds that engine back, but you can always go to some 351 closed chamber heads.
Here is a link to a builder with great knowledge of these engines:

http://www.tmeyerinc.com/category-s/1889.htm

DNFXDLI said:

They will respond like any other engine...straight up timing gears, cam, headers, intake and carb will get you some respectable numbers. The heads are the the one thing that holds that engine back, but you can always go to some 351 closed chamber heads.
Here is a link to a builder with great knowledge of these engines:

http://www.tmeyerinc.com/category-s/1889.htm

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Thanks. I actually checked that site out on a suggestion from another member. He is in Minnesota, which is good because I live in North Dakota.

79fordtrck said:

Thanks. I actually checked that site out on a suggestion from another member. He is in Minnesota, which is good because I live in North Dakota.

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I've dealt with him on my 434 build....he is very helpful and has great prices and lots of available parts.