This is topic R blocks question in forum Tech Talk at Northern California Ford Owners  .


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Posted by Chico Stang (Member # 801) on :
 
With regular 302 and 351 blocks, I thought the most you should bore them out to is .40 over. That 30 over was ok, and 40 over was pushing it.

Is this ture or false.

Then if it is true, how is Ronnie Wilson (5.0 Mustang & Super Fords October 2003 issue, page 181) able to have a 4.100 bore on his R302 block?

Right now he has a359 ci engine (4.100 bore and 3.400 stroke), and he says he is soon to have a 438 winsor.

Any one able to help me?
 
Posted by BOUNTY HUNTER VERT (Member # 2754) on :
 
false you can go .060 on both i have seen larger than that before too.
 
Posted by BOUNTY HUNTER VERT (Member # 2754) on :
 
r302 blocks have thicker sleves so you can go with a larger overbore
 
Posted by Chico Stang (Member # 801) on :
 
yea cause damn, that guy now has a bore of 4.1, which is pretty cool.

Whats the max overbore with an R block?

Thanks a lot.
 
Posted by BOUNTY HUNTER VERT (Member # 2754) on :
 
ive heard of .100 but i dont know of anything bigger than that
 
Posted by mustanggt5091 (Member # 444) on :
 
.100 [Eek!] [Eek!] holly s**t! Ive heard of .060 being just fine but heating problems can happen as well as block damage on certain blocks, but damn thats a big overbore!!!!! [Eek!]
 
Posted by jmcclesk (Member # 1355) on :
 
I have done a lot of 302 blocks and i think .040 is pushing it. Ford says you can go out to .125 on the r block. I have the sona ray check on my r-302 and i can tell you the walls are THICK. The walls on my r-302 are between, .340-.400 thick. The last b-50 block i had the walls were like .095-.125 thick. you get what you pay for. [burnout]
 
Posted by yellow67stang (Member # 903) on :
 
I just got done boring a R block 4.125. There was plenty of room.

And I also bored my w-block(351) 4.155.

Eric
 
Posted by jmcclesk (Member # 1355) on :
 
[burnout]

[ August 25, 2003, 05:07 PM: Message edited by: jmcclesk ]
 
Posted by Chico Stang (Member # 801) on :
 
God damn yellow stang, thats a lot of boring. Nice job.

And thnx for all the info guys; bounty hunter vert, jmcclesk, and yellow stang.

BTW, jmcclesk, my 97 F-150 truck is having some issues with the headlights. Any way you could help me. Maybe if I take it into you i coudl get a discount or something? They dont turn on sometimes, and then i have to giggle the windshield wipers lever and they go on, sometimes.

thanks everyone
 
Posted by jmcclesk (Member # 1355) on :
 
Call me i may be able to fix this one over the phone 916-395-6747
 
Posted by Chico Stang (Member # 801) on :
 
are you able to overbore these R blocks with both the cast iron version as well as the aluminum version? Or going to 1.25 overbore only for one or the other?
 




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