wesam

i want step forward and drop a stroker is it safe to bore the the 6.0 iron block
4.08 so i can put a 418 stroker in it ?
it will be N/A car maybe a 150 shot
or should i stay for 4.03 and a 408 ci

1FastBrick

iTrader: (16)

It's my understanding that when you go past .040 on the Iron 6.0 block You should have them sonic checked for thickness. Some go .060 and more and others will not safely go .060

wesam

so you think for my safety i should not go beyond 4.04 which will give 410 ci
so i will stay on the 408

any other suggestions ?

odarabla

iTrader: (1)

A buddy of mine went 0.060 over to build his 416ci with no issues what so ever.. Just be sure to have it sonic checked before boring it out.. This will let you know how much you can safely take out.. Good luck..

PREDATOR-Z

Agreed, this is the way to do it.

wesam

what do you mean guys by sonic check ?
is there a special tool with ultra sonic to check the block ?

1FastBrick

iTrader: (16)

Yes! check with your local engine machine shops. not every shop will have one.

67Ranger

iTrader: (16)

yes, a sonic tester is a very expensive tool, about $1000 for a cheap one, and I recently built a motor that was 4.070 on an iron block, but this was for LS7 heads. The only problem you will run into is piston and ring availability. Unless you are using LS7 heads and need a 4.070 bore, the extra 15-20hp (max) isnt enough of a difference to make it worth it IMO.

1FastBrick

iTrader: (16)

You mean Boring .060 or in your case .070 wont instanly give me 500HP... LOL! couldn't resist....

Its funny you mention that fact because its amasing how very few people actuall know that over boring exssesivly nets a very minimal gain if much at all. The only reson to really over bore is to get the cylinder walls True and maintain the best possible piston to wall clearance...

I saw a customers block for a restoration with a standard bore that was so far out of spec It only started to clean up at .030 but had to go .040 total to acheive the proper piston to wall clearance.

9secondsflat

the difference between a 408 and 416......its a coin toss at the end of the day...there are just as many 408s making more hp then 416 due to cam and head choice....i would stay safe stick with the 408 and optimize that set up...

1FastBrick

iTrader: (16)

X2. Well Put!

odarabla

iTrader: (1)

I also agree!! I think most people don't realize that the block in a since is dumn. It's the heads, intake and the cam that are going to make all the power. With LS1's I've seen 347ci motors make more power than a 383ci motor due to cam optimization, better flowing intake and a better set of flowing heads. Remember, no matter what CI motor you build. Get a good set of heads like Trick Flow, ETP, AFR etc and get a cam cut to optimize your setup.

PREDATOR-Z

That would be an all bore. You can do an all stroke. 4.100 crank and 4.00 bore for 412ci or 4.125 and 4.00 for 415ci.