I did some LSA head testing!
01-20-2013, 10:35 AM
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I was going to get these LSA castings flowed and the chambers CC'd before getting them CNC ported.
I went to a local shop to get some independent results. The shop I use is Forrest and Forrest-these guys have been around my area for long time and do alot of old school SBC, BBC stuff and are super knowledgeable.
I wanted there opinion and right away they were impressed with the castings-especially the chamber. For and as-cast head-it's impressive.
The chambers came in at 68.5 to 69cc's.
These were flowed on a 4" bore with a 1.75" pipe on the exhaust.
Now realize-every flow bench is different-let's not get hung up on numbers. I wanted a baseline-and will reflow them after Charlie@RPM motors does his CNC port program on the heads.
I will then do a valve job and reflow them-to see how much a good valve job is worth.
I have nice cam in mind for these heads already-something that will have nice street manners but make big power.
I went to a local shop to get some independent results. The shop I use is Forrest and Forrest-these guys have been around my area for long time and do alot of old school SBC, BBC stuff and are super knowledgeable.
I wanted there opinion and right away they were impressed with the castings-especially the chamber. For and as-cast head-it's impressive.
The chambers came in at 68.5 to 69cc's.
These were flowed on a 4" bore with a 1.75" pipe on the exhaust.
Now realize-every flow bench is different-let's not get hung up on numbers. I wanted a baseline-and will reflow them after Charlie@RPM motors does his CNC port program on the heads.
I will then do a valve job and reflow them-to see how much a good valve job is worth.
I have nice cam in mind for these heads already-something that will have nice street manners but make big power.
.200 - 185 cfm / .200 - 129 cfm
.300 - 265 cfm / .300 - 175 cfm
.400 - 301 cfm / .400 - 207 cfm
.500 - 329 cfm / .500 - 230 cfm
.550 - 343 cfm / .550 -240 cfm
.600 - 348 cfm / .600 - 245 cfm
.650 - 353 cfm / .650 - 248 cfm
.700 - 355 cfm / .700 -250 cfm
I should have my heads back soon as well and I will be flowing them on the same bench I originally flowed them on for comparison.
