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Old 02-13-2011, 06:19 PM
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the five stroke engine

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357 Horsepower and torque guesses

Hello everyone. I know this gets asked a lot , but if anyone has some spare time on their hands I was wondering if I could get some torque and horsepower guesstimates.Maybe someone with Performance trends or Dynosym ? Dont mean to bother anyone , just wanted to know if I was going in the right direction.Here's my combo. 357 SBC, Scat and Eagle bottom end with Sealed Power hypers.1.56 comp height,5cc valve reliefs, decked block to .005",.039" felpro head gasket, World sr torquer heads,ported with guide bosses narrowed , chambers deshroulded and polished, 69.5cc's,necked down milodon intake valves with backcut ,stock 1.6 exhaust valves with backcut.Heads of valves have been rounded to avoid over scavenging during overlap.Compression is 9.69.Cam is Comp special grind with 269/275 dur.,226/224 at .050".Lift is .486 intake (1.6 magnum rocker),.456(1.52 magnum rocker),108 lsa,4 degrees advanced. Crower camsaver lifters (race version with hardened foot and snap ring retaining clip).Manley springs ,titanium retainers,Cloyes timing chain. Professional products chrome cyclone intake with 4 hole spacer on top of aluminum spacer blended into plenum.Choice of 750 vacuum holley or 750 holley street hp double pumper.(both have throttle shafts thinned),Hi volume stock pressure oil pump,Moroso 7 qrt pan and windage tray.Long tube1 5/8 Flowtech headers (with header wrap),2.5 " by 40" collectors into 3" Flowmaster super 44's.Small anti reversion dam at header to exhaust port junction.HEI with Pertronix flamethrower module.4 core radiator with 160 degree thermostat.DCR should be around 8.1.Oh yeah,lots of ZDDP! Engine will be going into 1981 trans am with 2500 stall and 3.42 gears.Looking for about 375 horses and about 400 pounds of torque.Thanks .I know this was long winded,just trying to give enough info.

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Old 02-14-2011, 02:28 PM
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you are close in the area, id say your there or a little over...
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Old 02-14-2011, 09:40 PM
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the five stroke engine

Last journal entry: Last Year Pics
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Thanks for the reply gofastz.I have built a quite a few small blocks over the years but this one I would like to be a dependable durable weekend cruiser with a little oomph! The car still has a beater 350 in it so I've been taking my time building this one.I have been reading and listening to the best of my ability to people such as David Vizard ,Lingenfelter,FBIRD88,and Old Bogie.I guess one of my biggest questions is valve spring pressure.How much over the nose and seat pressure do I need with this cam (high hydraulic intensity),especially on the intake?
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