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.
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.
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.
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
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
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.
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.
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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