408 build in Australia

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VF69HARDTOP

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Hi all

Can I get some thoughts on a 408 build I have rolling around in my head. I'd like to get about 500hp from it at the engine. Would this set up get that figure?
I chose the cast crank as I contacted Scat and they rate it to 700hp and 7000rpm but no power adders and trans brake.
360 block
Scat cast stroker crank
Scat I beams
Forged pistons 10.5 to 11.5 comp
Edelbrock rpm alloy heads port matched and light flow work
Edelbrock rpm airgap inlet or victor 340
Pertronix flame thrower 3 ignition
Holley 750 or Sniper EFI kit
1 5/8" headers with twin 2.5" or 3" exhaust
Lunati roller rockers
Lunati solid flat tappet 251/259 @50 with .566/.586 lift
 
VF69HARDTOP said:
Hi all

Can I get some thoughts on a 408 build I have rolling around in my head. I'd like to get about 500hp from it at the engine. Would this set up get that figure?
I chose the cast crank as I contacted Scat and they rate it to 700hp and 7000rpm but no power adders and trans brake.
360 block
Scat cast stroker crank
Scat I beams
Forged pistons 10.5 to 11.5 comp
Edelbrock rpm alloy heads port matched and light flow work
Edelbrock rpm airgap inlet or victor 340
Pertronix flame thrower 3 ignition
Holley 750 or Sniper EFI kit
1 5/8" headers with twin 2.5" or 3" exhaust
Lunati roller rockers
Lunati solid flat tappet 251/259 @50 with .566/.586 lift
Click to expand...
What I might change is use Trick Flow heads (probably close to the cost of worked Edelbrock heads and you'll be getting a better head) and I would definitely go single plane. Might even go with a Super Victor or the Trick Flow intake.
 
Last edited:
VF69HARDTOP said:
Hi all

Can I get some thoughts on a 408 build I have rolling around in my head. I'd like to get about 500hp from it at the engine. Would this set up get that figure?
I chose the cast crank as I contacted Scat and they rate it to 700hp and 7000rpm but no power adders and trans brake.
360 block
Scat cast stroker crank
Scat I beams
Forged pistons 10.5 to 11.5 comp
Edelbrock rpm alloy heads port matched and light flow work
Edelbrock rpm airgap inlet or victor 340
Pertronix flame thrower 3 ignition
Holley 750 or Sniper EFI kit
1 5/8" headers with twin 2.5" or 3" exhaust
Lunati roller rockers
Lunati solid flat tappet 251/259 @50 with .566/.586 lift
Click to expand...
You forgot air conditioning
 
67autocross said:
My buddy is in Townsville...claims it was +32 the other day when he phoned me here in Winnipeg where it was -32...so I hung up on him
Click to expand...
Two summers ago in Adelaide, South Australia we hit 47.6deg C
Nice and hot!

Screenshot_20190124-152850.png
 
VF! I have a 410 in my charger. It had the 1 5/8 pacemaker headers on it with twin 2 1/2 inch exhaust. Had edelbrock home ported heads on it with air gap manifold and made 355 rwhp and ran 11.7 qtrs. I changed to the 1 3/4 into 2 inch into 3 inch collectors and 3 inch exhaust and power went up to 392 rwhp.Ran an 11.4 qtr. I then changed to trick flow heads , victor 340 manifold and next size up cam(237, 243 @ 50 with 610 lift) It now makes 425 rwhp but 1 5/8 pacemakers are too small for a stroker so as you can see the latest pacemakers make 37 more rear wheel horsepower with about 45 ft lbs more torque. Those trick flows cost me about $4500 landed but that was @ our dollar at 71c but is a lot better now. I have a set of speedmaster heads that I bought bare for $1000 and sent them to a guy in your state to do a full port job on and he charged me six grand but put 200 thou longer valves in but when I questioned him about the valves he said he always does that. I sent the valves back and eight months later he sent the correct valves. These heads owe me seven grand but I would take about half that if you know any one that wants them. They have 2.08 inlet valves in them and have a full port job and quality parts in them.
 
I think it depends on what "light flow work" means. In stock-ish form I think you would only be in the low-mid 400hp range, so you would need the heads ported a little to hit 500hp.
 
James Clews said:
VF! I have a 410 in my charger. It had the 1 5/8 pacemaker headers on it with twin 2 1/2 inch exhaust. Had edelbrock home ported heads on it with air gap manifold and made 355 rwhp and ran 11.7 qtrs. I changed to the 1 3/4 into 2 inch into 3 inch collectors and 3 inch exhaust and power went up to 392 rwhp.Ran an 11.4 qtr. I then changed to trick flow heads , victor 340 manifold and next size up cam(237, 243 @ 50 with 610 lift) It now makes 425 rwhp but 1 5/8 pacemakers are too small for a stroker so as you can see the latest pacemakers make 37 more rear wheel horsepower with about 45 ft lbs more torque. Those trick flows cost me about $4500 landed but that was @ our dollar at 71c but is a lot better now. I have a set of speedmaster heads that I bought bare for $1000 and sent them to a guy in your state to do a full port job on and he charged me six grand but put 200 thou longer valves in but when I questioned him about the valves he said he always does that. I sent the valves back and eight months later he sent the correct valves. These heads owe me seven grand but I would take about half that if you know any one that wants them. They have 2.08 inlet valves in them and have a full port job and quality parts in them.
Click to expand...
Hey James
Thanks for the info. I was looking at the bigger pacemakers and they certainly look the goods by your results. What cam part number are you running as that's nice lift with a mild duration, I tend to like mild duration big lift cams.
Out of interest, who is SA did the heads?
 
flyfish said:
I think it depends on what "light flow work" means. In stock-ish form I think you would only be in the low-mid 400hp range, so you would need the heads ported a little to hit 500hp.
Click to expand...
Was thinking of a general clean up and open up the bowels to the seats, guide area and port openings matched
 
I am not going to mention names but the heads flow a maximum of 287 cfm but do very good at the low lift numbers. The cam is a howards grind designed by B3 engineering to my requirements. I am 63 years old and do not like a car that is a pig to drive so I told Mike at B3 to design me a cam that made good power for my combination but was well behaved. It has a 112 lobe separation that really calms it down. The old Hughes grind , 234 / 238 on a 110 sep was okay but this one seems to operate much milder but now revs cleanly to 6500 but the older combination was all done by just before 6000. The dyno shows it has a little less torque but it does not feel that way on the road. By the way these are all roller hyd cams.Valve lift is 580 with 1.5 ratio rockers but I have 1.6 ratio that makes lift 610 or thereabouts.
 
VF! with that combination you have mentioned should make close to 500 That depending on the head work. Yes A solid cam would be good but with the clearance ramps is just a bit smaller than the numbers suggest. That is still a relative large street profile but.The lobe separation will determine how lumpy the cam behaves.Most large cams are on a 108 or smaller lobe sep to make real top HP but a wider lobe sep calms the cam down with a little less low to mid HP numbers but these strokers are torque monsters and you would never notice the torque loss on the street.
 
James Clews said:
VF! with that combination you have mentioned should make close to 500 That depending on the head work. Yes A solid cam would be good but with the clearance ramps is just a bit smaller than the numbers suggest. That is still a relative large street profile but.The lobe separation will determine how lumpy the cam behaves.Most large cams are on a 108 or smaller lobe sep to make real top HP but a wider lobe sep calms the cam down with a little less low to mid HP numbers but these strokers are torque monsters and you would never notice the torque loss on the street.
Click to expand...
Hey James
It's on a 110 lobe sep. I'd probably prefer something with a little less duration but more lift. I might look at some Hughes cams

Camshaft Type: Mechanical Flat Tappet
RPM Range: 2800 to 7000
Intake Valve Lift: .566"
Exhaust Valve Lift: .586"
Advertised Intake Duration: 280¡
Advertised Exhaust Duration: 288¡
Intake Duration @ .050": 251¡
Exhaust Duration @ .050": 259¡
Lobe Separation: 110¡
 
It shows how costly these old girls are to make power. I had a jap 180sx with a stock internal sr20det and with a small frame turbo upgrade on 18psi, small hks cams and injectors running on e85 it made 400rwhp and driven daily both suburban and highway with aircon the whole time for a heap less than what this engine build will cost
 
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