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04-05-2005, 03:04 PM
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#1 |
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Registered User
Join Date: Jan 2005
Location: Colorado Springs
Posts: 693
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My new engine combo results
Just thought I'd share my experience with anyone interested.
My engine started out as a warmed over L82 spec 355 engine with 882 casting cylinder heads milled 20 and larger valves 2.02/1.60 It had the L82 regrind from GM, I had a Edelbrock RPM intake with a 600CFM Edelbrock carb. To make a long story short this engine ran very good in the upper RPM's but lacked low end power for towing and climbing even with 4.10 gears. No power under 2500 RPM in my heavy truck. Last weekend I replaced the cam with a Comp Cam EX-4X4 cam and replaced the RPM intake with an Edelbrock EPS intake, my results are very satisfying I have monster low end torque, wonderful throttle response, and a real nice smooth idle. I haven’t towed with it yet but I am sure it will do much better. I didn’t get on it too hard yet but revved it to 4K and it felt just as strong if not stronger than before. I love the low end torque the most I can lug it clear down to 400rpm’s in 3rd and just pull right out by taping on the gas pedal. It would never do that before W/O chugging and bucking around. Anyone looking for more low end torque this is the way to go if anyone is interested in cam specs I can post them up.
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1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder |
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04-05-2005, 08:49 PM
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#2 |
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Registered User
Join Date: Apr 2004
Location: Las Vegas, NV
Posts: 2,189
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the L82 wasnt near enough cam for those heads. Just curious, what is the lift/adv duration of your cam now?
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RIP EastSideLowLife '72 C20 SWB convert. 5 lug, LS1/4l60e |
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04-06-2005, 12:04 PM
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#3 |
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Registered User
Join Date: Jan 2005
Location: Colorado Springs
Posts: 693
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I'll have to look at the card again but its a very conservative grind, but that is what I wanted something for low end torque, I went from 115 lobe seperation to 111 and I think that is what really helped.
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1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder |
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04-09-2005, 09:58 AM
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#4 |
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Registered User
 
Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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Threads merged.........
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04-11-2005, 10:21 AM
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#5 |
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Senior Member
Join Date: Apr 2001
Location: Amazonia, Mo. USA
Posts: 2,821
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1972 LT1. The engine is done and ready to go in.
Rule is the bigger the valves the higher the RPM range and the smaller the valves the low end torque comes on. There is more to it but you get the idea.
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72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide |
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04-11-2005, 12:21 PM
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#6 |
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Registered User
Join Date: Apr 2000
Location: Chester County PA, USA
Posts: 1,228
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What are the specs for a 72 LT1?? I race my blazer in 4x4 dirt drags and you can go in the slower class if you have a stock engine. They check casting numbers too.
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72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania |
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04-11-2005, 06:09 PM
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#7 |
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Senior Member
Join Date: Apr 2001
Location: Amazonia, Mo. USA
Posts: 2,821
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The 72 LT1 in stock form maxed at 255 HP with 280 ft. lbs. torque. This at 9.0:1 compression. The 400 came in at 170 HP and the 402 at 210 HP.
I have added an Edelbrock Performer, HEI, lifter valley baffle, crank scraper, 2.5" Ramhorns, undercut and swirl polished stainless valves, roller rockers in the 442 heads and a few other items. Everything should look like it belongs there with the exception of the intake. The HEI will hide behind the stock breather (which will have a K&N inside). I am also running the stock valve covers. You will never see the ported heads or roller rockers. The Ramhorns look just like the stock 2". I wanted a fair HP engine with good torque for the 4x4. This should work nicely.
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72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide |
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04-12-2005, 10:36 AM
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#8 |
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Registered User
Join Date: Jan 2005
Location: Colorado Springs
Posts: 693
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nu2-72 what cam are you going to be putting in your LT1? If you want super good torque I can't be happier with the one I just put in if you want my specs.
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1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder |
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04-12-2005, 02:33 PM
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#9 |
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Senior Member
Join Date: Apr 2001
Location: Amazonia, Mo. USA
Posts: 2,821
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I would have to look up the specs but it is already in and is the LT1 cam.
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72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide |
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