Project... Tinker !!! - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dieselarmy13 · 05-07-2008, 01:48 AM

What's the groove leading out of the combustion chamber for?

BurnoutNova · 05-07-2008, 02:22 AM

Quote:

Originally Posted by dieselarmy13

What's the groove leading out of the combustion chamber for?

i assume to lower the compression a little, but ive never seen that before?

67_C-30 · 05-07-2008, 05:35 AM

Yeah, do tell on the slot.
I don't understand the thinking because any sharp edges in the combustion chamber or quench area causes detonation. Those are #624 76cc smog heads, so lowering the compression shouldn't be the issue either?

lukecp · 05-07-2008, 05:45 AM

I was also wondering on the slots. I had a pair of those 624 heads on my truck with whopping 1.72/1.50 valves...it actually ran OK but when I put a pair of closed-chamber 2.02 heads on it it gave it a LOT more power. I don't think I'd run a pair on a 283 though because it would have really low compression.

Spray-Bomb · 05-07-2008, 07:22 AM

The heads were 58cc combustion chamber & they have 184 intake / 150 exhaust valves

After the mods I did to them they are now 60cc which is what the heads on my 283 were & they had 172 intake / 150 exhaust

What I did was, curve the casting so that it wasnt sharp ( as one of yall said, sharp edges make hot spots) it also makes less turbulence for the flame travel
The groove also aids in flame travel & I rounded it too, so its not a hot spot either

From what I have read, by doing the mods I did it should help me be able to run more compression on 87 octane crap gas

BurnoutNova · 05-07-2008, 07:36 AM

those sure dont look like 58cc combustion chambers, there way to big

Spray-Bomb · 05-07-2008, 07:48 AM

Not when you CC them

HoupPhotography · 05-07-2008, 08:48 AM

It could be a few things...
The cam wasn't broken in properly (lubed & ran)
The valves weren't adjusted properly (to tight)
or you got a bad cam, it could be a cheap cam too.

BurnoutNova · 05-07-2008, 10:05 AM

Quote:

Originally Posted by Spray-Bomb

Not when you CC them

do you have to take into account the thickness of the head gasket and the valve reliefs on the pistons?

they look like big open chambers, but im probly just not looking at them right?

what is the casting number?

Spray-Bomb · 05-07-2008, 08:39 PM

Quote:

Originally Posted by HoupPhotography

It could be a few things...
The cam wasn't broken in properly (lubed & ran)
The valves weren't adjusted properly (to tight)
or you got a bad cam, it could be a cheap cam too.

IDK what he did, but if I had to guess he just lubed & ran it, but again IDK

The cam was a Comp Cams 268H

Spray-Bomb · 05-07-2008, 08:41 PM

Quote:

Originally Posted by BurnoutNova

do you have to take into account the thickness of the head gasket and the valve reliefs on the pistons?

they look like big open chambers, but im probly just not looking at them right?

what is the casting number?

I have the casting numbers somewhere & I'll post em up for you, but I'm not looking for a pissing contest about my heads... I have em, I know what they are, & Im running them

HoupPhotography · 05-07-2008, 10:02 PM

Quote:

Originally Posted by Spray-Bomb

IDK what he did, but if I had to guess he just lubed & ran it, but again IDK

The cam was a Comp Cams 268H

Your right, it's hard to tell! The only sure thing is your getting a new one, with the head work you can put a nice thumper in it.
That truck is badass, if you ever want to sell it, let me know!!

BurnoutNova · 05-07-2008, 11:01 PM

Quote:

Originally Posted by Spray-Bomb

I have the casting numbers somewhere & I'll post em up for you, but I'm not looking for a pissing contest about my heads... I have em, I know what they are, & Im running them

i wasnt trying to argue, just understand what you did. thats all.

sorry for the miscommunication

Spray-Bomb · 05-08-2008, 04:39 AM

Quote:

Originally Posted by HoupPhotography

Your right, it's hard to tell! The only sure thing is your getting a new one, with the head work you can put a nice thumper in it.
That truck is badass, if you ever want to sell it, let me know!!

Thanks bro, I dont have any plans on selling it but I'll let you know

Quote:

Originally Posted by BurnoutNova

i wasnt trying to argue, just understand what you did. thats all.

sorry for the miscommunication

Its kool, thats one thing bout the internet, its always hard to tell what "tone" someone is using

The head number is 14014416

Bob 68327 · 05-08-2008, 06:16 AM

I have a comp cam that came out of wild mouse that has way more round lobes than yours !! I called them and they told me I must have installed wrong or improper break in !! Bulls@#t I will not use a comp cam again . Have too many friends that have had trouble with them getting flat lobes on em . I am sure someone will chime in and tell me they think they are great and it was my fault . I've been building motors for 20 yrs this was my first and last comp cam!!!! My 2 cents ! I think the cam you told me about will be great in your motor !! Later, Bob

BACKYARD88 · 05-08-2008, 06:30 AM

I was wondering why that cam sounded so healthy. Only 14 valves were opening

67_C-30 · 05-08-2008, 06:35 AM

Quote:

Originally Posted by Bob 68327

I am sure someone will chime in and tell me they think they are great and it was my fault . I've been building motors for 20 yrs this was my first and last comp cam!!!! My 2 cents ! I think the cam you told me about will be great in your motor !! Later, Bob

I've been building engines with Comps for years with no problems, but that doesn't mean they didn't ship one out without it being case hardened. It happened to GM in late 60's, and it could have happened at Comp. Either way that sucks, and I hate to hear about that.

Bob 68327 · 05-08-2008, 06:42 AM

Quote:

Originally Posted by 67_C-30

I've been building engines with Comps for years with no problems, but that doesn't mean they didn't ship one out without it being case hardened. It happened to GM in late 60's, and it could have happened at Comp. Either way that sucks, and I hate to hear about that.

I'm not saying they make junk . I had a bad experience and I don't forgive real easy . I will choose not to run them in the future . I hope this doesn't happen to anyone else and i got all the bad luck !! Bob

67_C-30 · 05-08-2008, 06:48 AM

Quote:

Originally Posted by Bob 68327

I'm not saying they make junk . I had a bad experience and I don't forgive real easy . I will choose not to run them in the future . I hope this doesn't happen to anyone else and i got all the bad luck !! Bob

I totally understand. If my first product from a manufacturer was bad, I sure wouldn't be in a hurry to buy from them again ESPECIALLY since customer service didn't help you out any.

Bob 68327 · 05-08-2008, 06:54 AM

Quote:

Originally Posted by 67_C-30

I totally understand. If my first product from a manufacturer was bad, I sure wouldn't be in a hurry to buy from them again ESPECIALLY since customer service didn't help you out any.

Yup They acted like since I didn't have a shop with my name on it or I wasn't what they call a "professional" I must be a automatic retard !!! So I felt that people like that don't need my money!!! Bob

Spray-Bomb · 05-08-2008, 07:56 AM

Quote:

Originally Posted by Bob 68327

Yup They acted like since I didn't have a shop with my name on it or I wasn't what they call a "professional" I must be a automatic retard !!! So I felt that people like that don't need my money!!! Bob

Bob, Im there with you

Its the only comp Ive ever ran & it sure doesnt make me want another one... Im not saying my brother couldnt have done something wrong, but I highly doubt it
I mean, hes about as picky / pefectionist as I am on engines & I dont think he would have just been a "Auto Retard"

I called Lunati & had a great experience with them... I called TALKED TO A PERSON, then that person tranfered me to ANOTHER PERSON !!!!
Great deal

I did call back later & the time between the first person & the second person was a lot longer than the INSTANT transfer I got the first time, but it sure beats the heck out of a lot of other companies that you have to have a user manual to get through the Auto system

BTW Bob, I showed you 2 cams... the 00017 & the 00010
Which one did you like better ???

Im thinking the 00010 even tho its prolly a lil big for my engine, it should be sweet

Spray-Bomb · 05-08-2008, 07:58 AM

Quote:

Originally Posted by BACKYARD88

I was wondering why that cam sounded so healthy. Only 14 valves were opening

I know right

The crazy thing is, it didnt run too bad

HoupPhotography · 05-08-2008, 08:12 AM

Everyone makes mistakes, even comp and especially folks that don't build motors for a living, even those that do make mistakes.

I'm sure what the comp guy was implying is that your not a "professional" builder, have a machine shop or install cams on a daily basis, it either came out wrong or was misinterprited. They would be around as long as they have if they built junk. (IMO)

Spray-Bomb · 05-08-2008, 08:37 AM

Quote:

Originally Posted by HoupPhotography

They would be around as long as they have if they built junk. (IMO)

I agree with that for the most part, but I also think it could be possible that they do occasionally send out some less than quality products

HoupPhotography · 05-08-2008, 08:43 AM

Quote:

Originally Posted by Spray-Bomb

I agree with that for the most part, but I also think it could be possible that they do occasionally send out some less than quality products

Absolutly, with what they produce per month, that is bound to happen.

05-07-2008, 01:48 AM	#26
dieselarmy13 Phone's ringin Dude. Join Date: Mar 2007 Location: Colorado Springs Posts: 1,426	Re: Project... Tinker !!! What's the groove leading out of the combustion chamber for? __________________ I pitty the fool with only two headlights!! 2003 SILVERADO SS--THE NEW GIRL 1972 GMC--THE OLD GIRL Last edited by dieselarmy13; 05-07-2008 at 01:48 AM.

05-07-2008, 05:35 AM	#28
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: Project... Tinker !!! Yeah, do tell on the slot. I don't understand the thinking because any sharp edges in the combustion chamber or quench area causes detonation. Those are #624 76cc smog heads, so lowering the compression shouldn't be the issue either? __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club!

05-07-2008, 05:45 AM	#29
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Re: Project... Tinker !!! I was also wondering on the slots. I had a pair of those 624 heads on my truck with whopping 1.72/1.50 valves...it actually ran OK but when I put a pair of closed-chamber 2.02 heads on it it gave it a LOT more power. I don't think I'd run a pair on a 283 though because it would have really low compression. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

05-07-2008, 07:22 AM	#30
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: Project... Tinker !!! The heads were 58cc combustion chamber & they have 184 intake / 150 exhaust valves After the mods I did to them they are now 60cc which is what the heads on my 283 were & they had 172 intake / 150 exhaust What I did was, curve the casting so that it wasnt sharp ( as one of yall said, sharp edges make hot spots) it also makes less turbulence for the flame travel The groove also aids in flame travel & I rounded it too, so its not a hot spot either From what I have read, by doing the mods I did it should help me be able to run more compression on 87 octane crap gas __________________ Just not low enough... ----------------------------- Sinister Killer

05-07-2008, 07:36 AM	#31
BurnoutNova Registered User Join Date: Mar 2004 Location: CA Posts: 2,057	Re: Project... Tinker !!! those sure dont look like 58cc combustion chambers, there way to big

05-07-2008, 07:48 AM	#32
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: Project... Tinker !!! Not when you CC them __________________ Just not low enough... ----------------------------- Sinister Killer

05-07-2008, 08:48 AM	#33
HoupPhotography Registered User Join Date: Feb 2008 Location: Phoenix, Az Posts: 1,204	Re: Project... Tinker !!! It could be a few things... The cam wasn't broken in properly (lubed & ran) The valves weren't adjusted properly (to tight) or you got a bad cam, it could be a cheap cam too. __________________ R.I.P. Scott Kalitta

05-08-2008, 06:16 AM	#40
Bob 68327 72 Chevelle Club Join Date: Jun 2007 Location: Newton , Iowa Posts: 2,052	Re: Project... Tinker !!! I have a comp cam that came out of wild mouse that has way more round lobes than yours !! I called them and they told me I must have installed wrong or improper break in !! Bulls@#t I will not use a comp cam again . Have too many friends that have had trouble with them getting flat lobes on em . I am sure someone will chime in and tell me they think they are great and it was my fault . I've been building motors for 20 yrs this was my first and last comp cam!!!! My 2 cents ! I think the cam you told me about will be great in your motor !! Later, Bob __________________ I Have The Right To Remain Silent,But Lack The Ability 1972 Chevelle ... Mine 2006 Trailblazer... Hers 2002 Buick century ... Kids 2002 K1500 Z-71 EXT CAB ... Daily Driver 2005 Rockwood Roo ... For Camping 1974 Harley-Davidson XLH Sportster 84'' stroker

05-08-2008, 06:30 AM	#41
BACKYARD88 On the fast track to nowhere.. Join Date: May 2006 Location: Splendora, Texas Posts: 5,316	Re: Project... Tinker !!! I was wondering why that cam sounded so healthy. Only 14 valves were opening __________________ -Mike Owen- Support the board here! 71 Chevy short fleet build thread Double D Norwood, Houston, Cecilia, Jackson, Monroe and counting

05-08-2008, 08:12 AM	#48
HoupPhotography Registered User Join Date: Feb 2008 Location: Phoenix, Az Posts: 1,204	Re: Project... Tinker !!! Everyone makes mistakes, even comp and especially folks that don't build motors for a living, even those that do make mistakes. I'm sure what the comp guy was implying is that your not a "professional" builder, have a machine shop or install cams on a daily basis, it either came out wrong or was misinterprited. They would be around as long as they have if they built junk. (IMO) __________________ R.I.P. Scott Kalitta



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