dsm-onster
DSM Wiseman
- 8,592
- 124
- Jul 11, 2004
-
Bloxom,
Virginia
Some of my thoughts and a question:
I know wiseco pistons, full floating pins, and rings can be had for under $500 shipped.
But, I am doing a budget 4g64 build here though. I have 2 spare sets of good 6bolt rods and arp rod bolts are very affordable. The piston speed of a 4g64 at 7390rpms is the same as a 63 at 8000rpms. The stock 6bolt rods can handle 8K at 500whp especially with ARP clamps.
I know that a 4g64 is a 7bolt 4g63 with a taller deck and .060 overbore. Swapping on a 63 DOHC head doesn't raise the compression of the 4g64 at all since the chamber volumes are the same. The 1g piston dish + headgasket volume is 26.42cc. The 2.4 4g64 cylinder volume is 587.5cc. So with a 1g piston dish and 63 headgasket, CR of a 4g64 would be just a hair over 9:1. The larger bore of the 64 head gasket would lower that right down to 9:1.
9:1 with a better ringland position of a turbo piston plus valve reliefs, rev limit of 7K with 6bolt rods and arp rod bolts; Sounds like a plan to me.
SOOO, where do you get cast oem (NPR, ITM) 1g .060 over pistons/rings? I've looked EVERYWHERE! Someone has to sell them. I can get these 1g rods cut for the 7bolt crank PLUS the larger pistons pressed on for $100. I've seen .040 over NPR pistons and rings for $100 shipped. $200 vs. $600 (wiseco pistons/pins/rings + 1g rod work) is much better for me with a block that will never see 550whp or 8000rpms. But can you even get .060 over OEM pistons????
I know wiseco pistons, full floating pins, and rings can be had for under $500 shipped.
But, I am doing a budget 4g64 build here though. I have 2 spare sets of good 6bolt rods and arp rod bolts are very affordable. The piston speed of a 4g64 at 7390rpms is the same as a 63 at 8000rpms. The stock 6bolt rods can handle 8K at 500whp especially with ARP clamps.
I know that a 4g64 is a 7bolt 4g63 with a taller deck and .060 overbore. Swapping on a 63 DOHC head doesn't raise the compression of the 4g64 at all since the chamber volumes are the same. The 1g piston dish + headgasket volume is 26.42cc. The 2.4 4g64 cylinder volume is 587.5cc. So with a 1g piston dish and 63 headgasket, CR of a 4g64 would be just a hair over 9:1. The larger bore of the 64 head gasket would lower that right down to 9:1.
9:1 with a better ringland position of a turbo piston plus valve reliefs, rev limit of 7K with 6bolt rods and arp rod bolts; Sounds like a plan to me.
SOOO, where do you get cast oem (NPR, ITM) 1g .060 over pistons/rings? I've looked EVERYWHERE! Someone has to sell them. I can get these 1g rods cut for the 7bolt crank PLUS the larger pistons pressed on for $100. I've seen .040 over NPR pistons and rings for $100 shipped. $200 vs. $600 (wiseco pistons/pins/rings + 1g rod work) is much better for me with a block that will never see 550whp or 8000rpms. But can you even get .060 over OEM pistons????
. Didn't even have to pull it. So that's why I'm working with it. But I agree. Working with a 6-bolt from the get-go would be better for me had this block not fallen in my lap.
