A couple of Power Questions. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WB72 · 05-23-2002, 04:09 PM

Has anybody used the Comp Cam # 270HE with a 670 CFM Holley? I also have an Edelbrock Performer Intake. I'm wondering if this will be enough fuel for my 350. I just have a RV cam in her now, but, I want to buy new tires every month or so (by burning them on the street). Do you think I will get 325 HP out of it? That is my goal.

Also I'm wondering what it would take to swap TH350 to 700R. Any tips?

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Grandfathers 72 custom Deluxe 66,000 miles.

*Randy70C-10* · 05-23-2002, 04:16 PM

That's a reasonable goal, but remember that 75% of your horsepower will come from the heads. It's all in how much fuel and air you can get into the engine, efficiently burn it, and get it back out.

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My name is Randy too! (not the one from Illinois) hehe
WWW.Randysrods.freeservers.com
1970 Chevy C-10 shortstep
1930 Ford Model A Coupe 4 inch chop, 350, GMC 671 blower-Hell yeah it's fast!
1987 Harley Sportster
2002 Harley Dyna Wide Glide

Virginia Beach, VA.

WB72 · 05-23-2002, 04:28 PM

My heads will be going to get worked on, I don't want to chance messing them up. If I tell the machine shop what I want to end up with, they should be able to do what I want them to, is that correct?

**MikeB** · 05-23-2002, 05:37 PM

600 cfm is enough for a mild 350. Unless you have low gears, good heads, and headers, I would go with a 600cfm Edelbrock Performer or 570 Holley Street Avenger on the Performer intake (not Performer RPM). What is your rear axle ratio? Also, what is the new cam's intake duration at .050" lift? As Randy said above, heads are the most important component. A stock engine with Vortec heads will run better than an engine with stocks heads, big cam, and 670 carb.

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MikeB
69 C-10 Fleetside, mild 383, Dart Iron Eagle heads, Crane Energizer 266 cam and 1.6 roller rockers, Edelbrock Performer manifold and 600cfm carb, HEI w/ MSD components, 1986 front spindles/disc brakes, Vintage Air in-dash.

[This message has been edited by MikeB (edited May 23, 2002).]

Stroker · 05-23-2002, 06:04 PM

I know it's sounding like a broken record, but the heads are the key to making decent power. I personally would not invest any money in a set of 20-30 year old heads. By the time they are properly rebuilt and ported you will spend almost what a set of aftermarket heads cost. And most likely more than a set of new Vortech heads. The Comp HE 270 cam, 9.5 to 1 compression,15/8 headers, RPM intake and that 670 Holley would get you an honest 350 to 375 HP. Add a 2400 stall converter and 3.73 gears and then start saving for tires.Good Luck!

colohusker · 05-23-2002, 06:24 PM

Here's an article that was posted a while back telling how to get 400 from a 350. I haven't done it yet, but this is probably what I'll do as a general guideline next year when I 'freshen up' my 350.

http://www.aros.net/~rbuck/chp/goodwrench1-1.html

Scott

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I say it's only money, my wife says it's only a truck....

'71 C10 Deluxe, factory ac, ps, pb, should be done by 2102

'70 C10? unknown
some pics... http://communities.msn.com/71chevy/s...nw?albumlist=2

Longmont, CO
husker95@hotmail.com

[This message has been edited by colohusker (edited May 23, 2002).]

[This message has been edited by colohusker (edited May 23, 2002).]

05-23-2002, 04:09 PM	#1
WB72 Before and After Join Date: Feb 2000 Location: Leduc, Alberta CANADA Posts: 632	A couple of Power Questions. Has anybody used the Comp Cam # 270HE with a 670 CFM Holley? I also have an Edelbrock Performer Intake. I'm wondering if this will be enough fuel for my 350. I just have a RV cam in her now, but, I want to buy new tires every month or so (by burning them on the street). Do you think I will get 325 HP out of it? That is my goal. Also I'm wondering what it would take to swap TH350 to 700R. Any tips? ------------------ Grandfathers 72 custom Deluxe 66,000 miles. __________________ Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA

05-23-2002, 04:28 PM	#3
WB72 Before and After Join Date: Feb 2000 Location: Leduc, Alberta CANADA Posts: 632	My heads will be going to get worked on, I don't want to chance messing them up. If I tell the machine shop what I want to end up with, they should be able to do what I want them to, is that correct? __________________ Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA

05-23-2002, 05:37 PM	#4
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,425	600 cfm is enough for a mild 350. Unless you have low gears, good heads, and headers, I would go with a 600cfm Edelbrock Performer or 570 Holley Street Avenger on the Performer intake (not Performer RPM). What is your rear axle ratio? Also, what is the new cam's intake duration at .050" lift? As Randy said above, heads are the most important component. A stock engine with Vortec heads will run better than an engine with stocks heads, big cam, and 670 carb. ------------------ MikeB 69 C-10 Fleetside, mild 383, Dart Iron Eagle heads, Crane Energizer 266 cam and 1.6 roller rockers, Edelbrock Performer manifold and 600cfm carb, HEI w/ MSD components, 1986 front spindles/disc brakes, Vintage Air in-dash. [This message has been edited by MikeB (edited May 23, 2002).] __________________ Mike 1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

05-23-2002, 06:04 PM	#5
Stroker Registered User Join Date: Mar 2001 Location: Moore, Ok Posts: 1,149	I know it's sounding like a broken record, but the heads are the key to making decent power. I personally would not invest any money in a set of 20-30 year old heads. By the time they are properly rebuilt and ported you will spend almost what a set of aftermarket heads cost. And most likely more than a set of new Vortech heads. The Comp HE 270 cam, 9.5 to 1 compression,15/8 headers, RPM intake and that 670 Holley would get you an honest 350 to 375 HP. Add a 2400 stall converter and 3.73 gears and then start saving for tires.Good Luck! __________________ 72 SWB parts and pieces Oklahoma

05-23-2002, 06:24 PM	#6
colohusker Registered User Join Date: Apr 2002 Location: Longmont, CO Posts: 436	Here's an article that was posted a while back telling how to get 400 from a 350. I haven't done it yet, but this is probably what I'll do as a general guideline next year when I 'freshen up' my 350. http://www.aros.net/~rbuck/chp/goodwrench1-1.html Scott ------------------ ------------------------------------------------ I say it's only money, my wife says it's only a truck.... '71 C10 Deluxe, factory ac, ps, pb, should be done by 2102 '70 C10? unknown some pics... http://communities.msn.com/71chevy/s...nw?albumlist=2 Longmont, CO husker95@hotmail.com [This message has been edited by colohusker (edited May 23, 2002).] [This message has been edited by colohusker (edited May 23, 2002).] __________________ ------------------------------------------------ I say it's only money, my wife says it's only a truck.... '71 C10 Deluxe, factory ac, ps, pb, should be done by 2102 Longmont, CO husker95@hotmail.com

05-23-2002, 04:16 PM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	That's a reasonable goal, but remember that 75% of your horsepower will come from the heads. It's all in how much fuel and air you can get into the engine, efficiently burn it, and get it back out. ------------------ My name is Randy too! (not the one from Illinois) hehe WWW.Randysrods.freeservers.com 1970 Chevy C-10 shortstep 1930 Ford Model A Coupe 4 inch chop, 350, GMC 671 blower-Hell yeah it's fast! 1987 Harley Sportster 2002 Harley Dyna Wide Glide Virginia Beach, VA.



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