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Old 10-02-2007, 03:40   #1 (permalink)
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Need info for 302/351 build

Hi

Just joined after having a look around and this seems to be the place to ask so here goes.

Bought an F100 a while ago and was told it was a 351, Only problem is the motor was smokey as hell so swapped it for another which has had a big end knock from the word go but anyway.....

Pulled the original motor apart and find it is only a 302 not the 351 that I was told it had. Not happy but is done.

What i need to know is how to make it a 351 as am recoing the motor to go back in the truck. Do I simply drop a 351 crank in and use the same rods etc or are the rods different between the two.
Am new to all this as have never done any work on a Clevo before, Has all been Jap stuff until now.


Hope it all makes sense and thanks in advance for any help/info.
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Old 10-02-2007, 08:40   #2 (permalink)
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Re: Need info for 302/351 build

351 is completly different. They are alot wider than a 302. To make it a 351,you'll have to buy a 351. You could stroke the 302, and make it a 347,or 331. You will have 351 power that way,if thats what your after.
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Old 10-02-2007, 14:46   #3 (permalink)
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Re: Need info for 302/351 build

Hi m.j.h,
91GT347 has made the assumption you have a Windsor, not a Cleveland. Since you have posted in the Cleveland forum i guess you know you have a Cleveland, not a Windsor.

If you are unsure, look at the front of the motor and if the timing cover housing is cast on to the block upi have a Cleveland. If you are still unsure post a pic and we'll tell you.

As for engines, the 302C and 351C have the [B]same[B] block. A change of crank,rods and pistons will increase your engine size to 351.

Depending on your budget, you could find these parts cheaply at the motor wreckers, or if you have a bit more cash, you could go for a stroker and get anything up to 408 cubes out of your Cleveland block. There are plenty of stroker kits around these days at good prices.

Given you have a heavy truck, a stroker may be worth thinking about. There are lots of guys on here that have done strokers and can help you get it right for your truck.

Hope this helps
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Old 10-02-2007, 15:40   #4 (permalink)
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Re: Need info for 302/351 build

also make sure you use the correct heads. 302 heads on the 351 will give very high compression aprox 11:1 with stock aussie pistons. 10:2 with u.s. dish tops. if you dont want this comp ratio then get some 351 heads. 302 heads have a sort of kidney shaped combustion chamber, 351 heads have a round combustion chamber, both heads are a bolt on job(no mods needed) you can get a piston that will allow you to run the longer 302 clevo rods with a 351 stroke, a bit more costly but great for torque, smooth revs and LPG. cheers
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Old 10-02-2007, 15:41   #5 (permalink)
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Re: Need info for 302/351 build

hey 91gt347, thats a nice lookin car.
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Old 10-03-2007, 02:11   #6 (permalink)
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Re: Need info for 302/351 build

Quote:
Originally Posted by cjperformance
also make sure you use the correct heads. 302 heads on the 351 will give very high compression aprox 11:1 with stock aussie pistons. 10:2 with u.s. dish tops. if you dont want this comp ratio then get some 351 heads. 302 heads have a sort of kidney shaped combustion chamber, 351 heads have a round combustion chamber, both heads are a bolt on job(no mods needed) you can get a piston that will allow you to run the longer 302 clevo rods with a 351 stroke, a bit more costly but great for torque, smooth revs and LPG. cheers
Exactly what I want the motor for.
Sounds like I will go with a new crank, 302 rods I have and some new dished pistons to suit.

Thanks for the replies and to answer another posters question, Yes it is definatly a Cleveland block I have not a Windsor. I know this cause the water outlet is in the block not the manifold. Only way I know to tell them apart.LOL
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Old 10-03-2007, 06:23   #7 (permalink)
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Re: Need info for 302/351 build

Yeah I just noticed the "never done any work on a Clevo before" in the last paragraph. Didnt notice which forum I was in either. Damn,I need to pay more attention huh ? Sorry about that. lol

Thanks alot for the compliment cjperformance. Its getting there.
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Old 10-03-2007, 16:27   #8 (permalink)
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Re: Need info for 302/351 build

m.j.h. the dish pistons wont work if using 302 length rods as the pin height will be different. the dish tops are a replacement for the 73 u.s. unleaded 351 and you need to use 351 rods with these. but they do give a great comp ratio with 302 heads. that is your cheapest way to achieve that 10.2:1. if you use the 302 rods and the appropriate pistons (or 351 rods and flat top standard type pistons) with 302 heads , you will be up to around 11.0:1 to get this down to 10.2:1 you will need to do some calculations and modify the combustion chamber accordingly. more work but worth it. any questions just ask me or if you prefer i can build the motor for you, either in parts, partially assembled or fully assembled ready to bolt in and start. cheers.
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Old 10-03-2007, 16:29   #9 (permalink)
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Re: Need info for 302/351 build

91GT347. ive always liked that shape mustang. they dont take much to make them look fast as hell. sounds like yours should go well too. i have always been a big windsor fan. cheers
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Old 10-04-2007, 06:52   #10 (permalink)
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Re: Need info for 302/351 build

It runs in the 11's. Not bad for such a small cam and 9:1 compression. It was put together for a turbo.
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