305 cam options... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigwheel15 · 03-09-2011, 03:21 AM

Ok well ive decided I want to put a small cam in my 305, ive been researching and reading all I can about cams and have landed on the comp cams XE262H. Now before anyone starts in with the "just get a 350" I am working with what I have but back on topic, would this cam work for my application? Im wanting good power with some chop to the idle. Also would I need to change the lifters, springs and everything or could this be a "simple" swap out?

gchemist · 03-09-2011, 03:30 AM

If are swapping the cam, you will need new lifters. Buy an entire kit. You may need to install new valve springs too. Check with Comp Cams. Call them!! They will help you choose a right cam for the 305. Don't under estimate the 305. I could smoke a stock 350 with my old 305. It only had minor changes. Torque and HP we really low for our truck engines.
Use this guide for swapping the cam: http://www.73-87.com/7387garage/drivetrain/cam.htm

burger · 03-09-2011, 03:08 PM

I have the XE262H cam in my daily driven 307. The idle is pretty mild. Fuel economy is about the same as stock (12 mpg). Driveability is good with the stock torque converter. FWIW, I have 3.73 gears and 9.7:1 compression.

If I were to do it again, I would select a cam one or two further down the chart.

bigwheel15 · 03-09-2011, 08:41 PM

I appreciate the help guys. So burger, what cam would you go with then? The 268h? Or would that not work?
Posted via Mobile Device

85chevy4x4 · 03-09-2011, 09:47 PM

for me people either love it or not really care for them i love comp cams thumper cams. They have a awesome idle but are still very streetable... in my opinion

79gmcc15 · 03-10-2011, 12:32 AM

Quote:

Originally Posted by bigwheel15

I appreciate the help guys. So burger, what cam would you go with then? The 268h? Or would that not work?
Posted via Mobile Device

I've had zero issues so far with my 268h in my 305. Real nice thump a thump a.

Posted via Mobile Device

bigwheel15 · 03-10-2011, 02:42 AM

Quote:

Originally Posted by 79gmcc15

I've had zero issues so far with my 268h in my 305. Real nice thump a thump a.

Posted via Mobile Device

When putting in the 268h cam kit can I just need to change the cam and lifters or do I have to change other things as well?

wardee1977 · 03-10-2011, 03:30 AM

I would also install the recomended valve springs for your specific cam. If you are not sure what springs to get, call comp cams. They are very helpful and will tell you exactly what u need.

79gmcc15 · 03-10-2011, 05:18 AM

From what I understand, the 268h is right about as big as you should on the stock converter. Other then that new lifters and springs, and you should replace your valve stem seals and umbrellas. Your going to wish you did when your motor starts burning oil.
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79gmcc15 · 03-10-2011, 05:26 AM

Quote:

Originally Posted by bigwheel15

When putting in the 268h cam kit can I just need to change the cam and lifters or do I have to change other things as well?

You "might" get away without running new springs. I would look into getting a sampling of them tested. But at that rate, you have to figure out if it makes sense to trust your new cam to ageing springs.

How many miles you have on this motor?
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burger · 03-10-2011, 01:18 PM

79gmcc15: Do you have any YouTube videos of your 305? I have a very lightly used XE268H cam (break-in time only) that I have thought about swapping into the 307.

bigwheel15: Buy the correct valve springs. They're only like $60. If you really want to cheap out, at least put in a set of "Z/28" valve springs (Sealed Power P/N VS739R or equivalent). They're pretty close to the ones Comp sells, but they're still going to set you back $30-40 so why not just buy the right ones?

85chevy4x4: What is your experience with the Thumpr cams? Which one did you install? How badly does it affect gas mileage? How much vacuum does it produce?

spudz · 03-10-2011, 02:06 PM

instal a stock 350 cam TRW #274 cam or sealed power cs274. Ebay has this cam new right now for like 35 bux.. and then buy new lifters. dual plane intake, 1.6 rockers, headers, no bigger then 600cfm carb, etc. some fine tuning... yada yada. AND I promise..... it will beat up on any stock 350 square.......

79gmcc15 · 03-11-2011, 02:33 AM

I recorded my breaking period. But if it's the sound at idle you're looking for I can make that for you. Just a little warning, my muffler is shot so it doesn't sound ideal.
Posted via Mobile Device

rayfinseats · 03-11-2011, 10:48 AM

The more duration, (262 degrees) the more the power band moves up the RPM scale. If you have too much duration you will have no bottom end torque and it could be a dog with no power. Generally the more duration, the WORSE gas milage. SO a drag car would have more duration (in degrees)and a 4x4 would have less to be ideal.

allengator · 03-11-2011, 10:55 AM

Quote:

Originally Posted by gchemist

If are swapping the cam, you will need new lifters. Buy an entire kit. You may need to install new valve springs too. Check with Comp Cams. Call them!! They will help you choose a right cam for the 305. Don't under estimate the 305. I could smoke a stock 350 with my old 305. It only had minor changes. Torque and HP we really low for our truck engines.
Use this guide for swapping the cam: http://www.73-87.com/7387garage/drivetrain/cam.htm

THIS IS THE ANSWER YOU NEED!!!

Dont ask us... call COMP CAMS!!
They are GREAT to talk to!
they will want to know your gear ratio, trans, etc... and will make a professional recomendation!

and yes... ALWAYS new lifters with a new cam...

burger · 03-11-2011, 03:07 PM

Quote:

Originally Posted by 79gmcc15

I recorded my breaking period. But if it's the sound at idle you're looking for I can make that for you. Just a little warning, my muffler is shot so it doesn't sound ideal.
Posted via Mobile Device

That would be awesome! Would it be too much to ask for a little revving and maybe a smokey burnout too??

Thanks,
Ed

burger · 03-11-2011, 03:09 PM

Quote:

Originally Posted by allengator

THIS IS THE ANSWER YOU NEED!!!

Dont ask us... call COMP CAMS!!
They are GREAT to talk to!
they will want to know your gear ratio, trans, etc... and will make a professional recomendation!

and yes... ALWAYS new lifters with a new cam...

Incidentally, the XE262H is exactly what Comp recommended for my truck. My specs are in one of the posts at the beginning of this thread.

Ed

79gmcc15 · 03-11-2011, 07:37 PM

Well here ya go and more! It's about ten min long. The quality isn't that great. My first time doing this. So here ya go!

YouTube - 79 GMC C1500 305 ride along

*nbpro* · 03-11-2011, 07:44 PM

http://www.summitracing.com/search/B...c&autoview=SKU

bigwheel15 · 03-12-2011, 06:03 PM

Whats everyones opinion on summits summ-k1103? Comparable to the comp cams 262h?
Posted via Mobile Device

burger · 03-14-2011, 02:41 PM

79gmcc15: Thanks for posting the clip. I'll check it out when I get home.

03-09-2011, 03:21 AM	#1
bigwheel15 Registered User Join Date: Feb 2010 Location: Fort Worth, TX Posts: 727	305 cam options... Ok well ive decided I want to put a small cam in my 305, ive been researching and reading all I can about cams and have landed on the comp cams XE262H. Now before anyone starts in with the "just get a 350" I am working with what I have but back on topic, would this cam work for my application? Im wanting good power with some chop to the idle. Also would I need to change the lifters, springs and everything or could this be a "simple" swap out?

03-09-2011, 03:08 PM	#3
burger Registered User Join Date: Sep 2005 Location: philly burbs Posts: 160	Re: 305 cam options... I have the XE262H cam in my daily driven 307. The idle is pretty mild. Fuel economy is about the same as stock (12 mpg). Driveability is good with the stock torque converter. FWIW, I have 3.73 gears and 9.7:1 compression. If I were to do it again, I would select a cam one or two further down the chart.

03-09-2011, 08:41 PM	#4
bigwheel15 Registered User Join Date: Feb 2010 Location: Fort Worth, TX Posts: 727	Re: 305 cam options... I appreciate the help guys. So burger, what cam would you go with then? The 268h? Or would that not work? Posted via Mobile Device

03-09-2011, 09:47 PM	#5
85chevy4x4 Registered User Join Date: Jun 2009 Location: Mills River NC Posts: 80	Re: 305 cam options... for me people either love it or not really care for them i love comp cams thumper cams. They have a awesome idle but are still very streetable... in my opinion __________________ 85 custom deluxe 4x4 4 speed 350sb

03-10-2011, 03:30 AM	#8
wardee1977 Registered User Join Date: Oct 2010 Location: Northern New York Posts: 18	Re: 305 cam options... I would also install the recomended valve springs for your specific cam. If you are not sure what springs to get, call comp cams. They are very helpful and will tell you exactly what u need.

03-09-2011, 03:30 AM	#2
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: 305 cam options... If are swapping the cam, you will need new lifters. Buy an entire kit. You may need to install new valve springs too. Check with Comp Cams. Call them!! They will help you choose a right cam for the 305. Don't under estimate the 305. I could smoke a stock 350 with my old 305. It only had minor changes. Torque and HP we really low for our truck engines. Use this guide for swapping the cam: http://www.73-87.com/7387garage/drivetrain/cam.htm __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

03-10-2011, 05:18 AM	#9
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: 305 cam options... From what I understand, the 268h is right about as big as you should on the stock converter. Other then that new lifters and springs, and you should replace your valve stem seals and umbrellas. Your going to wish you did when your motor starts burning oil. Posted via Mobile Device __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby

03-10-2011, 01:18 PM	#11
burger Registered User Join Date: Sep 2005 Location: philly burbs Posts: 160	Re: 305 cam options... 79gmcc15: Do you have any YouTube videos of your 305? I have a very lightly used XE268H cam (break-in time only) that I have thought about swapping into the 307. bigwheel15: Buy the correct valve springs. They're only like $60. If you really want to cheap out, at least put in a set of "Z/28" valve springs (Sealed Power P/N VS739R or equivalent). They're pretty close to the ones Comp sells, but they're still going to set you back $30-40 so why not just buy the right ones? 85chevy4x4: What is your experience with the Thumpr cams? Which one did you install? How badly does it affect gas mileage? How much vacuum does it produce?

03-10-2011, 02:06 PM	#12
spudz Registered User Join Date: Oct 2005 Location: Branchville SC Posts: 1,647	Re: 305 cam options... instal a stock 350 cam TRW #274 cam or sealed power cs274. Ebay has this cam new right now for like 35 bux.. and then buy new lifters. dual plane intake, 1.6 rockers, headers, no bigger then 600cfm carb, etc. some fine tuning... yada yada. AND I promise..... it will beat up on any stock 350 square....... __________________ 2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks..

03-11-2011, 02:33 AM	#13
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: 305 cam options... I recorded my breaking period. But if it's the sound at idle you're looking for I can make that for you. Just a little warning, my muffler is shot so it doesn't sound ideal. Posted via Mobile Device __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby

03-11-2011, 10:48 AM	#14
rayfinseats Registered User Join Date: Dec 2010 Location: sioux city, iowa Posts: 619	Re: 305 cam options... The more duration, (262 degrees) the more the power band moves up the RPM scale. If you have too much duration you will have no bottom end torque and it could be a dog with no power. Generally the more duration, the WORSE gas milage. SO a drag car would have more duration (in degrees)and a 4x4 would have less to be ideal.

03-11-2011, 07:44 PM	#19
nbpro Account Suspended Join Date: Dec 2008 Location: Huntsville,AL Posts: 2,119	Re: 305 cam options... http://www.summitracing.com/search/B...c&autoview=SKU

03-12-2011, 06:03 PM	#20
bigwheel15 Registered User Join Date: Feb 2010 Location: Fort Worth, TX Posts: 727	Re: 305 cam options... Whats everyones opinion on summits summ-k1103? Comparable to the comp cams 262h? Posted via Mobile Device

03-14-2011, 02:41 PM	#21
burger Registered User Join Date: Sep 2005 Location: philly burbs Posts: 160	Re: 305 cam options... 79gmcc15: Thanks for posting the clip. I'll check it out when I get home.



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