Cam selection

« **on:** August 05, 2014, 01:08:13 PM »

Hey guys, need opinion and/or views on a cam kit....I have a 396 bbc 30 over I think, gm hi perf heads roller tip rockers....flattened my cam, 2 collapsed lifters and a broken spring. I was looking at comp cam kits and got three that I think would work but not sure...

info greatly appreciated...here are my 3 choices

« **Reply #1 on:** August 05, 2014, 01:12:58 PM »

A few of us have ran the xm 278 and love it. I have it in my 454 now. The torque curve is amazing.

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« **Reply #2 on:** August 05, 2014, 01:19:36 PM »

Any concerns with water reversion?

« **Reply #3 on:** August 05, 2014, 06:04:49 PM »

What heads do you have?

My stock 049 large oval port heads only had clearance for about .575 lift. Any more than that and you will have to have the spring inner bosses machined for added clearance (it'll start crushing the valve stem seals).

« **Reply #4 on:** August 05, 2014, 07:43:33 PM »

Her is a pic of my cam card and a video of what it sounds like. I bought the matching springs with the cam. I also have 049 heads. I am very pleased with the performance of my boat. The torque through the powerband is outstanding. Sounds bitchin' too.

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« **Reply #5 on:** August 05, 2014, 08:35:49 PM »

From my understanding they specifically designed all of their marine cams to prevent reversion

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« **Reply #6 on:** August 05, 2014, 08:37:11 PM »

I run my headers dry though. Running them wet just isnt worth the risk to me. I've seen and heard of too many people blowing there engine because a check valve gets stuck

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« **Reply #7 on:** August 05, 2014, 10:45:53 PM »

This is going to sound condescending... And maybe it is.

So you lost a cam due to going flat..... And your going to put in another flat tappet?

I instantly heard my grandads voice "when something breaks, that is the perfect time to make it much better".

Turn in some beer bottles for a while and get a roller camshaft. Do it once, do it right.

GT

« **Reply #8 on:** August 05, 2014, 11:02:44 PM »

Quote from: crewchief22 on August 05, 2014, 06:04:49 PM

What heads do you have?

My stock 049 large oval port heads only had clearance for about .575 lift. Any more than that and you will have to have the spring inner bosses machined for added clearance (it'll start crushing the valve stem seals).

Not sure what exactly kind of heads they are.....

I know they are rectangle port gm hi perm.....here's a few pics if it can help.

« **Reply #9 on:** August 05, 2014, 11:11:10 PM »

Quote from: GT Jets on August 05, 2014, 10:45:53 PM

This is going to sound condescending... And maybe it is.

So you lost a cam due to going flat..... And your going to put in another flat tappet?

I instantly heard my grandads voice "when something breaks, that is the perfect time to make it much better".

Turn in some beer bottles for a while and get a roller camshaft. Do it once, do it right.

GT

i was going to do an xm comp cam hydraulic flat tappet....few guys have said go full roller...checked out the price and as nice as it would be to do and as much beer I would enjoy drinking to afford that I don't think full roller is an option....

« **Reply #10 on:** August 05, 2014, 11:17:25 PM »

Here's the cam I pulled out of boat

« **Reply #11 on:** August 05, 2014, 11:22:19 PM »

Quote from: mayhem35 on August 05, 2014, 11:11:10 PM

i was going to do an xm comp cam hydraulic flat tappet....few guys have said go full roller...checked out the price and as nice as it would be to do and as much beer I would enjoy drinking to afford that I don't think full roller is an option....

Well, then let me know before you buy one and I will sell you mine at a discounted rate... I have the whole kit, brand new in the box. I am ordering a roller and want to put another motor together to potentially run CJ next year.

I can't remember the exact grind, but it is the XM series from comp.

I assume you already built the rest of the motor? That metal went somewhere...

« **Reply #12 on:** August 05, 2014, 11:26:59 PM »

Looks fairly reasonable to me...

http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=CL11-445-8&Category_Code=

« **Reply #13 on:** August 05, 2014, 11:27:57 PM »

BTW I have a NIB XM-270-H and Comps lifters.

GT

edit;

If you insist on running a flat tappet deal, install a rev kit. Cheap insurance.

GT

« **Reply #14 on:** August 05, 2014, 11:34:53 PM »

Quote from: GT Jets on August 05, 2014, 11:22:19 PM

Well, then let me know before you buy one and I will sell you mine at a discounted rate... I have the whole kit, brand new in the box. I am ordering a roller and want to put another motor together to potentially run CJ next year.

I can't remember the exact grind, but it is the XM series from comp.

I assume you already built the rest of the motor? That metal went somewhere...

didnt find any damage or metal anywhere....

just the collapsed lifter....all the sleeves are good oil looked good..a little watery but that was from reversion...

« **Reply #15 on:** August 05, 2014, 11:38:20 PM »

Quote from: mayhem35 on August 05, 2014, 11:34:53 PM

didnt find any damage or metal anywhere.... just the collapsed lifter....all the sleeves are good oil looked good..a little watery but that was from reversion...

Your first post says "flattened my cam"....

You screwing with me? You cannot knock a lobe off of a cam without passing quite a lot of metal throughout the engine. Simply cannot be done.

Not trying to stir the pot. Just hate seeing folks throw good money at bad.

GT

« **Reply #16 on:** August 05, 2014, 11:41:09 PM »

Quote from: GT Jets on August 05, 2014, 11:26:59 PM

Looks fairly reasonable to me...

http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=CL11-445-8&Category_Code=

this is what I would need....I think...

Xtreme Marine™, XM284HR: Cam & Kit
Product Representation: Actual part may vary based on configuration ordered.
Part:   K11-451-8
Price:   $1,020.79
Weight:   31.65 lbs FREE SHIPPING OVER $50!
Quantity:

HYDRAULIC ROLLER: Good for jet boat with A impeller. Great for spleasure or performance use.
Click here for Camshaft Specs

*BBC - 1965-66 396 c.i. models have an oiling groove in the rear journal. The listed part numbered cams will not fit these models, so if you require a camshaft with the oiling groove, please call us at 1-800-999-0853 or click here to contact us, and we will assist you with placing an order.

« **Reply #17 on:** August 05, 2014, 11:44:00 PM »

Quote from: GT Jets on August 05, 2014, 11:38:20 PM

Your first post says "flattened my cam"....

You screwing with me? You cannot knock a lobe off of a cam without passing quite a lot of metal throughout the engine. Simply cannot be done.

Not trying to stir the pot. Just hate seeing folks throw good money at bad.

GT

not screwing with you at all......I'll see if I can send a pic of cam

« **Reply #18 on:** August 05, 2014, 11:47:49 PM »

Here it is....

« **Reply #19 on:** August 05, 2014, 11:54:59 PM »

This is what I was leaning towards....

Xtreme Marine™, XM278H: Cam & Kit
K11-240-4

« **Reply #20 on:** August 05, 2014, 11:56:55 PM »

Quote from: mayhem35 on August 05, 2014, 11:41:09 PM

this is what I would need....I think...

Xtreme Marine™, XM284HR: Cam & Kit
Product Representation: Actual part may vary based on configuration ordered.
Part:   K11-451-8
Price:   $1,020.79
Weight:   31.65 lbs FREE SHIPPING OVER $50!
Quantity:

HYDRAULIC ROLLER: Good for jet boat with A impeller. Great for spleasure or performance use.
Click here for Camshaft Specs

*BBC - 1965-66 396 c.i. models have an oiling groove in the rear journal. The listed part numbered cams will not fit these models, so if you require a camshaft with the oiling groove, please call us at 1-800-999-0853 or click here to contact us, and we will assist you with placing an order.

Do you have logs?

That is a lot of cam for a cruiser...

GT

« **Reply #21 on:** August 05, 2014, 11:57:26 PM »

Quote from: mayhem35 on August 05, 2014, 11:54:59 PM

This is what I was leaning towards....

Xtreme Marine™, XM278H: Cam & Kit
K11-240-4

Do you know how nasty that cam is?

GT

« **Reply #22 on:** August 05, 2014, 11:59:21 PM »

Quote from: mayhem35 on August 05, 2014, 11:47:49 PM

Here it is....

Motor full of fine metal shavings.... Pull it down and measure everything... JMHO.. Also check the front thrust surface of the block behind where the cam sprocket rides.

GT

« **Reply #23 on:** August 06, 2014, 12:00:08 AM »

Quote from: GT Jets on August 05, 2014, 11:56:55 PM

Do you have logs?

That is a lot of cam for a cruiser...

GT

no, I have Bassett headers....

« **Reply #24 on:** August 06, 2014, 12:02:33 AM »

Quote from: GT Jets on August 05, 2014, 11:57:26 PM

Do you know how nasty that cam is?

GT

no....is this not a good choice....

mayhem35

Ckaz21

mayhem35

crewchief22

Roadrunner

Ckaz21

Ckaz21

GT Jets

mayhem35

mayhem35

mayhem35

GT Jets

GT Jets

GT Jets

mayhem35

GT Jets

mayhem35

mayhem35

mayhem35

mayhem35

GT Jets

GT Jets

GT Jets

mayhem35

mayhem35