In the process of planning on a 389 SBC build. I'd like to hear what the possible output of the motor will be (horsepower and torque wise). I'd also like to hear your opinions and suggestions on parts selection... Here's what I got...
ONLY parts I have thus far is a Block which is a machined Vortec 350 Bored 4.060". It was a fully machined block ready for rebuild from a crate engine maker that went under.
I am planning but getting really close to pull the trigger on bottom and top ends.
This will be a street car 67 Impala TH400, tall rear gear. Plan on building for cruiser nice kick ***** street cruiser not drag race bruiser. This is a low budget build. Please keep that in mind. not planning to turn past 6000RPM. So peak power at 5400-5700RPM max is fine
Looking for heads so far Patriot Performance offered me a super deal on the top end, heads, edelbrock intake Howards Hyd roller cam OE roller lifters, gasket match intake all top end gaskets and provide all gaskets and hardware.
here is current plan:
-67 Chevy Impala assume 4000+#
-TH400 auto with stock converter will change to match cam if needed
-3.07 rear tall gears stock tires right now figure 2000-2500 cruise RPM
-Want street car 80% hwy cruising 55-75mph, car shows may go on 200-300 mile cruises. Run on Pump gas 87-92 availiable. figure good low to mid torque cam to get big heavy car moving. On a side note I may take it to strip once a year for muscle car days. may change rear and tranny in time. This is only for fun cruising NOT drag car.
-We are at 1000Ft altitude if that makes a difference.
-'96-'97 SBC 350 block OE Hyd Roller 1 pc rear seal
-trying to shoot for 0.038-0.45 quench
-most likely ext balance (on budget)
-Looking at Skip White's rotating assembly Scat 9000 Crank, PC rods, and Probe -12cc dish pistons. Comes balanced with rings, damper and flex plate. I really like the pistons and rods not sosure on the rods.
Patriot Performance 190cc AL heads
Combustion Chamber: 64cc
Intake Runner: 190cc
Exhaust Runner: 62cc
Intake Valve: 2.02"
Exhaust Valve: 1.60"
Max. Valve Spring Lift: 0.575"
Spring Pressure Closed: 115 lbs. @ 1.800"
Spring Pressure Open: 310 lbs. @ 1.225"
Flow according to PP
(these # were provided by Patriot Performance on there new design they claim they have not updated there web page yet with new data)
-Intake Edelbrock #2601 dual plane Performer airgap
-Original Carb Quadra jet will be rebuilt
-Cam will be a Howards I have to provide spec to Patriot if I go that route. Howards reccomends : 180325-10
225i 233e @ 0.050"
278i 286e seat to seat
.525"i .530"e lift. with 1.5" rockers
Here is a link to all HOWARDS SBC OE roller cams IF YOU SEE ONE THAT IS BETTER FIT LMK.
-Lifters Howards OE Hyd roller
Here are a couple a questions:
1) What is you opinion will this be a good match up for the 67 Impala ?
2) The Vortec Bock is setup for OE hyd roller lifters is still better to run retorfit Hyd roller lifers ? can is even be done ? There is a $100 adder to go Retro Hyd roller lifters.
3) If I go kit route have not measured deck yet but will GM head gasket work with 4.060" bore GM 0.028 head gasket and will gasket work with AL heads ?
4) Looking at what Howards has to offer any you think would work better ?
5) For best bang for buck better deals on top end ?
6) Please feel free to give advice please control the mud slingin on heads.
PLEASE SHARE THOUGHTS.