new bare iron block, what machine work required?
01-24-2010, 05:50 PM
#21
10 Second Club
iTrader: (5)
Join Date: Nov 2007
Location: Cincinnati
Posts: 1,052
Likes: 0
Received 0 Likes
on
0 Posts
I never said that .030 over was the max, and I do realize that you can build the 414 you listed with a .060 over bore.
How do you determine that multiple cleanups are available above 4.030? I realize that sonic testing would be the only way to know what the max is for a given block. I searched through the catalogs for Mahle & Wiseco and I found pistons for LS applications varied, but 4.000, 4.005, 4.010, 4.030, 4.065 and 4.070 are all available. Oddly, neither one listed 4.060, but I assume Speed Pro or some one else must offer that as well. All of Mahle's & Wiseco's pistons were only offered one size over 4.030, either 4.065 or 4.070. I assume custom pistons may be available at sizes in between, but at what cost?
I get that there is no replacement for displacement. My point earlier was to ask what is the difference in power between similar engines with a 4.005/4.030/4.065 bore and a 4.00 stroke - not the difference between a 370 and a 408. If the economic difference between 370 and 408 is only $300 - $500, that too is a no-brainer, much the same debate as 355 vs. 383 on a Gen I SBC.
For the original poster, my only point was why bore a virgin block .030 over and leave possibly one rebuild on the block? Is that worth 7 hp? Is maxing out the bore worth another 7 hp over that, knowing that you would have to purchase another block and start over if a ring land broke or a valve dropped?
How do you determine that multiple cleanups are available above 4.030? I realize that sonic testing would be the only way to know what the max is for a given block. I searched through the catalogs for Mahle & Wiseco and I found pistons for LS applications varied, but 4.000, 4.005, 4.010, 4.030, 4.065 and 4.070 are all available. Oddly, neither one listed 4.060, but I assume Speed Pro or some one else must offer that as well. All of Mahle's & Wiseco's pistons were only offered one size over 4.030, either 4.065 or 4.070. I assume custom pistons may be available at sizes in between, but at what cost?
I get that there is no replacement for displacement. My point earlier was to ask what is the difference in power between similar engines with a 4.005/4.030/4.065 bore and a 4.00 stroke - not the difference between a 370 and a 408. If the economic difference between 370 and 408 is only $300 - $500, that too is a no-brainer, much the same debate as 355 vs. 383 on a Gen I SBC.
For the original poster, my only point was why bore a virgin block .030 over and leave possibly one rebuild on the block? Is that worth 7 hp? Is maxing out the bore worth another 7 hp over that, knowing that you would have to purchase another block and start over if a ring land broke or a valve dropped?
