How big of a difference are breathing holes when sleeving?
#1
How big of a difference are breathing holes when sleeving?
Hey guys,
I spoke with ERL Performance about either sleeving a 5.3 block or a LS2 block for a 427 or 454 build for my 67 Camaro. The person I spoke with said the 5.3 had more meat and people using a blower typically like it better. However, he said that the LS2 had breathing holes and many people thought they made more power in NA applications even though he couldn't confirm it. At this point, I don't have either block so I can go either way. My question is does the breathing hole make that big of a difference and does it have an effect on power?
Here is my top end: Nick Williams 102mm, Holley Hi Ram, Lingenfelter CNC Ported Heads, PAC 1205X Springs, Tony Mamo Spec Cam, LS7 Roller Rockers with Trunion upgrade.
I plan on going NA and maybe run 7-8 psi in the future.
Thanks guys!
I spoke with ERL Performance about either sleeving a 5.3 block or a LS2 block for a 427 or 454 build for my 67 Camaro. The person I spoke with said the 5.3 had more meat and people using a blower typically like it better. However, he said that the LS2 had breathing holes and many people thought they made more power in NA applications even though he couldn't confirm it. At this point, I don't have either block so I can go either way. My question is does the breathing hole make that big of a difference and does it have an effect on power?
Here is my top end: Nick Williams 102mm, Holley Hi Ram, Lingenfelter CNC Ported Heads, PAC 1205X Springs, Tony Mamo Spec Cam, LS7 Roller Rockers with Trunion upgrade.
I plan on going NA and maybe run 7-8 psi in the future.
Thanks guys!
#7
Seth told me that on any motor they can drill a hole thru the main web and create a breathing port so it really doesn't matter which block you go with relative to breathability