I have a ported super victor with an Accufab 4150 on my Dart 225s right now.
Im most like going with either a Holley Hi ram or a Mast single plane.
Yeah, I think thats the direction I'm going to have to go.BILL-C wrote: ↑Fri Oct 13, 2017 6:39 amGo with the l-92 heads . Both intakes good. I'm getting excited about this build and it's not even mine! We have 4 LS builds going on in shop now. Turbocharged L-92 in a land speed racer, supercharged 427lsx with cnc ported cathedrals, LQ-4 with cnc ported cathedrals going into S-10 drag truck, and another LQ-4 with cnc ported cathedrals going into 70 nova. This platform is really starting to grow on me.
It aboslutely does. I don't have the formulas in my notes to calculate airflow/CSA requirements for displacement/RPM, so it does help. I try and determine it from my old SAM notebook, guesstimating from other combos I've been a part of re:airflow, displacement, and RPM.swampbuggy wrote: ↑Fri Oct 13, 2017 11:07 pmHey Shockwave, I am currently working out my intake port for my engine 371 C.I., 8500 RPM, 18 Deg. engine. If you are gonna spin your 408 even 7800 to 8000 i am pretty sure the Dart LS-3 head will NOT be too big of a port. Keep in mind the liquid fill of the port (280cc) does NOT tell you the whole story, you HAVE to know the MCSA (Minimal Cross Sectional Area) which is the MORE important number (measurement). I figure that i will need a MCSA of 2.90 sq. in. + or - a tad. So i think the Dart head would work pretty darn good, also remember if the port is too small your air speed CAN be too great creating atomization problems. I hope something said here helps you. Mark H.
There ya go....sell everything and buy complete sb2.2 (many ex cup engines with outstanding parts and years of expert development)
Yep, stock rotating assembly. I bought the motor and T56 with 25k miles on it from the owner of SAM. It came out of his wrecked 35th anniversary Camaro.peejay wrote: ↑Sat Oct 14, 2017 9:21 amNot to sidetrack, but stock rods and pistons? How about the rod bolts?
Thank you very much man. Im adding these to my notes.swampbuggy wrote: ↑Sat Oct 14, 2017 9:07 amShockwave, here are some formulas for figuring out appx. C.S.A. 1. Bore x Bore x Stroke x R.P.M. x .00353 divided by 613.8 = C.S.A. 2. IF you know your peak C.F.M----------C.F.M. x 2.4=______ divided by 300 feet per second (is a nice target) = C.S.A. 3.By intake valve size, example, 2.180 x .90 = 1.962 , 1.962 x 1.962 x .7854 = 3.023 sq. in. C. S. A. Hope this helps , BTW these most likely originated from D. M. Mark
I have looked into it, but the only affordable castings are the RHS small bore LS7 heads, and theyre designed for 3.900 bore.A_VAS wrote: ↑Sat Oct 14, 2017 10:06 amBILL-C, fyi the L92 head would be a truck head, and no does not have the hollow stem intakes. Only the LS3 heads (car heads) get the hollow intakes.
the truck valves are more like 120g
Shockwave, if you are gonna buy heads have you checked into a LS7 head fitting this bore? smaller exh valve
a set of nice take-offs and you get the good intake valves...good port...good chamber...knock the wing out and do a valve job/guides to fix the GM crapola. yet another option to contemplate.