New engine Build-Up
Thread Starter
Instructor
Joined: May 2001
Posts: 136
Likes: 0
From: Hillsborough North Carolina
New engine Build-Up
Hello everyone.
I am in the planning stages of a new engine for my '72 Vette.
I am thinking about a 350,9.5-to-1 comp, vortec heads, performer intake,comp cams XE262 cam, headers. Just your basic engine rebuild. from this combo, what kind of HP and torque can I expect? Is this a reasonable cam for use in a street engine? I am looking for a dependable street engine, more power than stock, and a slight lope at idle. Looking at an RPM range of about 1500 thru 5500 maybe 6000.
any advice or comments would be appreciated.
Mike
I am in the planning stages of a new engine for my '72 Vette.
I am thinking about a 350,9.5-to-1 comp, vortec heads, performer intake,comp cams XE262 cam, headers. Just your basic engine rebuild. from this combo, what kind of HP and torque can I expect? Is this a reasonable cam for use in a street engine? I am looking for a dependable street engine, more power than stock, and a slight lope at idle. Looking at an RPM range of about 1500 thru 5500 maybe 6000.
any advice or comments would be appreciated.
Mike
Burning Brakes
Joined: Oct 2001
Posts: 1,146
Likes: 0
From: Milford NH
Re: New engine Build-Up (piratemike)
Dyno2000 claims 328 HP @ 5000 RPM and 400 TQ @ 3500 RPM. Torque is flat until 3500 RPM. (355 w/ L31 heads, 262 cam, 600 cfm, dual plane intake, small tube headers with mufflers).
According to the Comp Cam website http://www.compcams.com/information/...ts/DynoSheets/ , with 355. 9.25:1 compression, performer intake, World S/R heads. 1-5/8" headers, Max Torque 415 ft*lbs @ 3700 RPM, Max Power 348 HP @ 5300 RPM, Manifold Vacuum 17.5" Hg @ 800 RPM & 18.5" Hg @ 1000 RPM w/ no load.
According to the Comp Cam website http://www.compcams.com/information/...ts/DynoSheets/ , with 355. 9.25:1 compression, performer intake, World S/R heads. 1-5/8" headers, Max Torque 415 ft*lbs @ 3700 RPM, Max Power 348 HP @ 5300 RPM, Manifold Vacuum 17.5" Hg @ 800 RPM & 18.5" Hg @ 1000 RPM w/ no load.
Drifting
Joined: Apr 2002
Posts: 1,736
Likes: 37
From: Stockton Ca
Re: New engine Build-Up (piratemike)
You are doing you homework, good job! You are not overcammed but maybe under carbed. A 650 and a Performer RPM will add hp & tq w/o loss of low end. Adding 1.6 roller rockers on a small cam will help hp/tq and the reduced friction will run cooler in my experience. This engine will have 400 hp & 400+ tq by my SWAG.
Rick
Rick
Burning Brakes
Joined: Oct 2001
Posts: 1,146
Likes: 0
From: Milford NH
Re: New engine Build-Up (69stingray)
Mike, I was doing something else and realized I screwed up your Dyno2000 file. I had large valves for the L31 as opposed to 1.94/1.50. The smaller valves helped the results.
393 TQ @ 4,000 RPM
323 HP @ 5,000 RPM
Almost a flat torque curve until 4,000 RPM, should be a nice street motor!
393 TQ @ 4,000 RPM
323 HP @ 5,000 RPM
Almost a flat torque curve until 4,000 RPM, should be a nice street motor!
