Street Manners With this combo?

B

brad.arcova

Member
Grumpy,

What kind of street manners should I expect with this combo at low-mid rpm?

3500 lb car
Tremec 5sp with 3.27 1st gear
3.36 rear end
27 inch outside diameter tires

Blueprint Engines SB-Chevy 383ci/ 405HP/ 440TQ
http://www.jegs.com/p/Blueprint-Engines/Blueprint-Engines-SB-Chevy-383ci-405HP-440TQ/761056/10002/-1

9.5:1 compression
GM Vortec cast iron heads
Hardened retainers and 1.25'' diameter valve springs
2.02'' swirl polished intake valves
1.60'' swirl polished exhaust valves

Camshaft Specs:
Hydraulic Flat Tappet
Duration @ .050'' Lift: 234 Intake / 244 Exhaust
Lift: .487'' Intake / .508'' Exhaust
Lobe Separation: 112°

Thanks!
Brad
 
that's an interesting combo of parts, and the use of a manual transmission goes a long way to making it a viable and potential fun combo,the heads are too restrictive, on a 383 sbc for true max hp and the cams a bit too large for the heads flow capacity,and intended power range but each tends to cancel out some of the limitations of the other component and compensates a bit for the other,and given the limited info, Id expect ,its not going to idle smoothly and its going to require you to keep the engine up in the 2500rpm-3000plus rpm range to remain instantly responsive, and a 3.54:1 rear gear would help if its strictly used for racing, but otherwise it should be a very impressive and fun car to drive, and pull fairly well to at least 6200rpm
just be sure its got a heavy duty radiator and a 7-8 quart baffled oil pan and Id bet its a really fun car to drive aggressively,as a week end toy, Id suspect it won,t get the best mileage but I bet you won,t care much with the grin on your face.
 
Well, got to be honest with myself; I won't drive like that. Decided to change the cam and intake to match what I'm REALLY going to do: My goal is best fuel efficiency and high torque at low RPM. I normlly drive in the idle-2500 rpm range; occasionally to 3000 rpm; rarely to 3500 and never above 4000 rpm.

Thought about having some fun with it like it is but the engine's not in the car and it's SOOO much easier to change cam with the engine out of the car.

The intake has to change so I'll probably get an idle to 5500RPM Weiand 8121 dual plane, aluminum for SBC Chevy with Vortec Heads and square bore carb.

Still working my way through all your cam selection posts and manufacturer contacts and not finished yet. Here's what I'm lookin at so far:

COMP 12-407-8[10] SR252HR
Hydraulic Roller
Duration @ .050'' Lift: 200 Intake / 206 Exhaust
Lift: .472'' Intake / .480'' Exhaust

Crower 00480
Hydraulic Roller
Duration @ .050'' Lift: 196 Intake / 204 Exhaust
Lift: .465'' Intake / .484' Exhaust

Sorting out whether a "late model" core (w/step nose) is needed, whether or not to get a small base circle cam for 383s and whether to get a steel or cast iron gear.

Brad
 
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