Previous Thread
Next Thread
Print Thread
What is the biggest overbore a 340 block can take? #855720
11/17/10 12:04 AM
11/17/10 12:04 AM
Joined: Feb 2005
Posts: 71
Round lake, IL
R
ra340 Offline OP
member
ra340  Offline OP
member
R

Joined: Feb 2005
Posts: 71
Round lake, IL
Has any one sonic checked a stock 340 block to see how big of overbore a 340 can take? I have seen blocks bore .060 over to 4.100 Has anyone gone past this to 4.125?

Re: What is the biggest overbore a 340 block can take? [Re: ra340] #855721
11/17/10 12:12 AM
11/17/10 12:12 AM
Joined: Jan 2003
Posts: 20,918
A collage of whims
topside Offline
Too Many Posts
topside  Offline
Too Many Posts

Joined: Jan 2003
Posts: 20,918
A collage of whims
Sonic testing only tells you what that individual block can go out to; if you're planning a max bore you'll need to test the block you have in mind.
Stiffer walls make more power than the last .010 or so you can cut away.

Re: What is the biggest overbore a 340 block can take? [Re: topside] #855722
11/17/10 12:46 AM
11/17/10 12:46 AM
Joined: Feb 2005
Posts: 71
Round lake, IL
R
ra340 Offline OP
member
ra340  Offline OP
member
R

Joined: Feb 2005
Posts: 71
Round lake, IL
I plan to have any block I overbore past .030 sonic tested.

My question is if going past 4.070 is a good idea. If someone has sonic checked a 340 block I like them to post their findings. We could all use this information as to what is a safe overbore for most 340 blocks.

Re: What is the biggest overbore a 340 block can take? [Re: ra340] #855723
11/17/10 12:55 AM
11/17/10 12:55 AM
Joined: Mar 2003
Posts: 5,193
NEW JERSEY
AARCONV Offline
master
AARCONV  Offline
master

Joined: Mar 2003
Posts: 5,193
NEW JERSEY
back then 40 was the most...but with the new r blocks u can go more

Re: What is the biggest overbore a 340 block can take? [Re: AARCONV] #855724
11/17/10 06:02 PM
11/17/10 06:02 PM
Joined: Feb 2005
Posts: 71
Round lake, IL
R
ra340 Offline OP
member
ra340  Offline OP
member
R

Joined: Feb 2005
Posts: 71
Round lake, IL

Re: What is the biggest overbore a 340 block can take? [Re: ra340] #855725
11/17/10 08:08 PM
11/17/10 08:08 PM
Joined: Nov 2004
Posts: 354
K
kielbasa Offline
enthusiast
kielbasa  Offline
enthusiast
K

Joined: Nov 2004
Posts: 354
as big as the sonic check allows you to........
I just had my 1971 360 block sonic checked for the second time (from a different party than the first time) because the numbers first time around came in a little too good to be true, block was already punched .040 over in a previous rebuild, but thrust surfaces still range from .200 to .350 yet........

Last edited by kielbasa; 11/17/10 08:13 PM.






Powered by UBB.threads™ PHP Forum Software 7.7.1