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Hello everyone, i just received my Blueprint Engines 383 today. I am wondering if I need to be concerned about the wavy torque line on the Dyno sheet.
Thanks for any input
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Could be the cam, intake and the heads combo. I would be more concerned with why it falls off at 5500 rpm. Did you tell them you wanted an all torque motor and that you spend all your time below 5000 rpm? Did you say you wanted an RV cam? What Cam, heads and intake did you order with it?
What kind of driver are you? If you want a high torque motor that is going to spin the tires a lot and be really fun down low, be a rocket off the line and be a great cruiser, then it looks like you are going to get it. You just wont have a lot of top end which most folks dont use. Most people around here dont get much higher than 4000 rpm, ....ever
Could be the cam, intake and the heads combo. I would be more concerned with why it falls off at 5500 rpm. Did you tell them you wanted an all torque motor and that you spend all your time below 5000 rpm? Did you say you wanted an RV cam? What Cam, heads and intake did you order with it?
What kind of driver are you? If you want a high torque motor that is going to spin the tires a lot and be really fun down low, be a rocket off the line and be a great cruiser, then it looks like you are going to get it. You just wont have a lot of top end which most folks dont use. Most people around here dont get much higher than 4000 rpm, ....ever
this is the Blueprint Engines 383 crate motor. I purchased it just the way they advertise it, minimum 436 HP, 443 TQ, cam is 230/236/110, heads are 195cc intake/75cc exhaust, 64cc combustion chambers, and 2.02/1.60 valves,, but yes I will spend 100% of my driving time below 5000rpm's. Just a red light cruiser. I was just worried about the wavy torque line. It's definitely not the perfect arc
Last edited by Lotventures; Oct 1, 2025 at 06:56 PM.
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Flatter would be nicer but the display is 2000 to 6000 so its going to look worse that a 1000 to 7000 graph...it bunches the points on the graph closer so it looks steeper thanbit will feel. You will be fine. What intake is on it and will it fit under your hood?
Flatter would be nicer but the display is 2000 to 6000 so its going to look worse that a 1000 to 7000 graph...it bunches the points on the graph closer so it looks steeper thanbit will feel. You will be fine. What intake is on it and will it fit under your hood?
Thanks, thats good to know. The Intake is BPE's own source, a dual plane aluminum vortec knock off probably according to their part number. It will fit under my hood with a drop base air cleaner
Obviously the flatter the better, but keep in mind those waves are only around 25 ft/lbs. Being well above 400 from 2500 to 5000 should be a very fun engine.
Obviously the flatter the better, but keep in mind those waves are only around 25 ft/lbs. Being well above 400 from 2500 to 5000 should be a very fun engine.
That is what I'm hoping for, a little spirited driving once in a while
HP curve is also peaky and within the very same ranges as TQ curve; it's just not so obvious. But the two closely coincide.
And the two curves always cross at approx 5250; but they always will.
*those other columns of numbers (not shown on graph paper) may reveal more; that's why they were recorded: fuel use etc.
** that dyno sheet is dated over a year and a half ago (01/20/24) ---- and you just received motor Fall 2025 ?
Are you certain THAT sheet truly represents Your motor ?
HP curve is also peaky and within the very same ranges as TQ curve; it's just not so obvious. But the two closely coincide.
And the two curves always cross at approx 5250; but they always will.
*those other columns of numbers (not shown on graph paper) may reveal more; that's why they were recorded: fuel use etc.
** that dyno sheet is dated over a year and a half ago (01/20/24) ---- and you just received motor Fall 2025 ?
Are you certain THAT sheet truly represents Your motor ?
Look into your exhaust ports or through your sparkplug holes - should be easy to tell if the engine was actually run on a dyno or engine stand. it may be that they just never set the correct date on the dyno.
Pat
BPE 383 dyno sheet
