First off, special thanks to Hotrodpaul for offering to help out a newb like me. I think I learned more information from him last night than I've learned from any books and manuals I've read over the past few months lol. I'd recommend him to anyone in the Houston area wanting to get some head work done. Anyway, I headed over to his place last night after Church so he could examine my 243's and stick them on the flow bench. Here are some pics:




















The numbers (intake) done on a 3.900" bore:

lift flow cfm @ 28"
.050 32
.100 64
.150 98
.200 135
.250 167
.300 194
.350 217
.400 235
.450 250
.500 260
.550 260
.600 252

I'm having paul do some port work on them in the next few weeks then we'll stick it on the flow bench again for some before and after comparisons.

 

whats up with the drop in cfm at .600?

 

Both sets I've done have done this stock as well.........I worked them a little bit and it came back around. Nothing too crazy, just touchin up. But then by .650 or .700 its falling off again. Nature of the beast?

 

freakin sweet pics!!!

good info, i jsut picked up a set of 243's

 

Yeah after around .500 lift turbulence got worse and worse. If I remember right Paul said one of the reasons is the velocity of the air traveling around the short turn radius is so great that it literally cannot make the turn and ends up slamming into the other side of the throat creating turbulence. He could probably answer the question better than myself though lol.

 

Cool dude. Good luck with the project.

 

thanks for the pics.

243's will fit on a 5.3 stock bore right?

 

man that's neat, I've never seen pics of flow bench like that, or one at all. . . keep us posted