DRIVEN said:
Sweetness! I was hoping for atleast 300. Hopefully with a 3.73 rear gear and a nice stall I'll be running 13's
horsepower guess
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Sweetness! I was hoping for atleast 300. Hopefully with a 3.73 rear gear and a nice stall I'll be running 13's
I used DYNO2000. It's not super specific when it comes to input figures. I just try to be as honest as I can with the specs and if in doubt I round down. No idea how accurate it truly is but it probably gives a decent ballpark figure.MPac said:
MPac thatd be great let me see if i can get all the information
displacement: 355
type of cyl. head: gm cast iron 3927185 148cc intake runner 70cc chamber maybe
valve size: 1.72 int. 1.50 exh.
comp. ratio: 9.5:1 maybe
carb. size: edelbrock 600 cfm
manifold type: aluminum
headers: hooker 1 5/8in. full length
cam/lifter type: hydraulic
lift: .429 intake .438 exhaust
IVO BTDC: 17
EVO BBC:64
IVC ABDC: 49
EVC ATDC: 18
duration: 246 int. 263 exh.
overlap: 34.50 degrees
displacement: 355
type of cyl. head: gm cast iron 3927185 148cc intake runner 70cc chamber maybe
valve size: 1.72 int. 1.50 exh.
comp. ratio: 9.5:1 maybe
carb. size: edelbrock 600 cfm
manifold type: aluminum
headers: hooker 1 5/8in. full length
cam/lifter type: hydraulic
lift: .429 intake .438 exhaust
IVO BTDC: 17
EVO BBC:64
IVC ABDC: 49
EVC ATDC: 18
duration: 246 int. 263 exh.
overlap: 34.50 degrees
for new cylinder heads i was thinking about investing in some aluminum heads, and for the horsepower im trying to reach i just wanted to get above the 300hp mark not really asking too much.
258hp @ 4000rpm
404tq @ 2000rpm
The torque drops off immediately. It looks like your heads are probably the biggest choke point. This engine would probably work well with a three speed and the typical tall stock (crappy) Gbody gears. The graph has very similar similar curves to the 400 in my El Camino. It tows like a melon farmer but wouldn't be too impressive on the race track.
On a side note, when the spec sheet asks for manifold type it's referring to design (single plane, dual plane, tunnel ram, etc) not what it's made from (aluminum or cast iron). I assumed dual plane on both.
404tq @ 2000rpm
The torque drops off immediately. It looks like your heads are probably the biggest choke point. This engine would probably work well with a three speed and the typical tall stock (crappy) Gbody gears. The graph has very similar similar curves to the 400 in my El Camino. It tows like a melon farmer but wouldn't be too impressive on the race track.
On a side note, when the spec sheet asks for manifold type it's referring to design (single plane, dual plane, tunnel ram, etc) not what it's made from (aluminum or cast iron). I assumed dual plane on both.
Driven or MPac,
Wanna give my set up a shot?
displacement: 355
type of cyl. head: gm cast iron 492 heads, 64cc chambers
valve size: 2.02 intake/ 1.60 exhaust
comp. ratio: approx 9.75:1
carb. size: Holley 650 CFM Vac Secondaries
manifold type: Dual Plan Edelbrock RPM Performer
headers: stock exhaust manifolds
cam/lifter type: hydraulic
lift: .489/.504 (Int/Exh)
IVO BTDC: See below *
EVO BBC: See below *
IVC ABDC: See below *
EVC ATDC: See below *
duration: Advertised Duration (Int/Exh): 268/276; Duration @ .050 (Int/Exh): 227/233
overlap: See below *
* Not sure where to find IVO BTDC, EVO BBC, IVC ABDC, EVC ATDC or Overlap, but here is the cam card: http://www.lunatipower.com/Product.aspx?id=1984
Thanks -- ElCam
Wanna give my set up a shot?
displacement: 355
type of cyl. head: gm cast iron 492 heads, 64cc chambers
valve size: 2.02 intake/ 1.60 exhaust
comp. ratio: approx 9.75:1
carb. size: Holley 650 CFM Vac Secondaries
manifold type: Dual Plan Edelbrock RPM Performer
headers: stock exhaust manifolds
cam/lifter type: hydraulic
lift: .489/.504 (Int/Exh)
IVO BTDC: See below *
EVO BBC: See below *
IVC ABDC: See below *
EVC ATDC: See below *
duration: Advertised Duration (Int/Exh): 268/276; Duration @ .050 (Int/Exh): 227/233
overlap: See below *
* Not sure where to find IVO BTDC, EVO BBC, IVC ABDC, EVC ATDC or Overlap, but here is the cam card: http://www.lunatipower.com/Product.aspx?id=1984
Thanks -- ElCam
307hp @ 5500rpm
340tq @ 4000rpm
This one was strange. The overall numbers seem low for the combination you have listed. Thinking I input something wrong, I went back over it for mistakes but found none. I plugged in a 750cfm carb just to see if it would be happier but it only gained about 3hp/2tq on average. Then I plugged in large tube headers with mufflers. It gained you 45hp/50tq. Looks like exhaust may be holding you back.
Nice flat torque curve with over 300lbs between 2500-5200rpm. Horsepower is relatively flat too. The graph would indicate that it probably has pretty good street manners.
340tq @ 4000rpm
This one was strange. The overall numbers seem low for the combination you have listed. Thinking I input something wrong, I went back over it for mistakes but found none. I plugged in a 750cfm carb just to see if it would be happier but it only gained about 3hp/2tq on average. Then I plugged in large tube headers with mufflers. It gained you 45hp/50tq. Looks like exhaust may be holding you back.
Nice flat torque curve with over 300lbs between 2500-5200rpm. Horsepower is relatively flat too. The graph would indicate that it probably has pretty good street manners.
thanks alot the transmission in there is an old th200. i was thinking the best way to go would be to go find a th350 and do a stock rebuild with a shift kit like mpac suggested.
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