Advice on heads...please. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

thejoker · 01-26-2006, 10:00 AM

I bought a '79 truck for various parts for my '68, engine being one. I pulled the engine apart a week or so ago and found the casting numbers on the heads are not matching. They are the same as far as specs. I've got a problem reusing them because the casting aren't the same. Am I being anal or am I right not to use these head?

Here's my plan. I bought an Edelbrock C3B highrise intake a few weeks ago, so now the engine has taken on more of a performance build than originally intended. I'm not wanting to go all out high performance but I want the components to compliment each other. I'm considering a set of camel humps for the heads, does this sound in line with what I want? What do you suggest? Keep in mind budget is an issue.

JKR

junkyardjohn · 01-26-2006, 05:26 PM

NO ONE SEEMS TO BE ASWERING YOUR QUESTION, SO I'LL GIVE IT A SHOT. I'VE BUILT SEVERAL MOTORS (BOTH BIG & SMALL BLOCK) & I THINK WITH TODAYS VORTEC HEADS, THAT YOU WOULD BE HARD PRESSED TO COME UP WITH A HEAD WITH BETTER FLOW NUMBERS FOR THE DOLLARS YOU'D SPEND. TO ME... IT WOULD BE NO QUESTION. I'D GO WITH NEW G.M. VORTECS OR SOME NICE AFTERMARKET HEADS.

JOHN
OH... I WOULDN'T USE THOSE MISMATCHED HEADS EITHER. THEY MAY WORK OK... BUT I'D NEVER FIND OUT.

70rs/ss · 01-26-2006, 06:00 PM

You can mismatch them as long as you aren't trying to put a 63 cc head on with a 73 cc head. They were mismatched from the factory sometimes and deffinately over time. If you are going perf the votrecs are a good chioce if you are not going with a lot of lift (.450 is the max, some push it to .500) I have two or three sets of the double hump heads and I love them. Dollar for dollar you can go through a set of double humps for about the same money as the vortecs ($500ish) I just like the duble hump look!!

thejoker · 01-27-2006, 12:10 AM

Thanks for the replies. I would like to go with the Vortecs but demand is one problem and the other is fitment with the intake I have. I really want to stick with the intake I mentioned above.

Both of the heads I have are 73cc heads and I want to go with some 63cc heads.

JKR

01-26-2006, 10:00 AM	#1
thejoker Registered User Join Date: Jun 2005 Location: Gulfport Mississippi Posts: 364	Advice on heads...please. I bought a '79 truck for various parts for my '68, engine being one. I pulled the engine apart a week or so ago and found the casting numbers on the heads are not matching. They are the same as far as specs. I've got a problem reusing them because the casting aren't the same. Am I being anal or am I right not to use these head? Here's my plan. I bought an Edelbrock C3B highrise intake a few weeks ago, so now the engine has taken on more of a performance build than originally intended. I'm not wanting to go all out high performance but I want the components to compliment each other. I'm considering a set of camel humps for the heads, does this sound in line with what I want? What do you suggest? Keep in mind budget is an issue. JKR __________________ **Have you ever danced with the devil in the pale moonlight....I ask that of all my prey** 68' C10 Short Step (rebuilding as we speak) 72' Custom Camper (wrecked, parting out) 79' C10 Fleet (rough, parting out) 97' C1500 Short Step Custom (DD) 97' Kawaski VN800a Customized 99' Z71 Silverado 04' Suzuki Volusia

01-26-2006, 05:26 PM	#2
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: Advice on heads...please. NO ONE SEEMS TO BE ASWERING YOUR QUESTION, SO I'LL GIVE IT A SHOT. I'VE BUILT SEVERAL MOTORS (BOTH BIG & SMALL BLOCK) & I THINK WITH TODAYS VORTEC HEADS, THAT YOU WOULD BE HARD PRESSED TO COME UP WITH A HEAD WITH BETTER FLOW NUMBERS FOR THE DOLLARS YOU'D SPEND. TO ME... IT WOULD BE NO QUESTION. I'D GO WITH NEW G.M. VORTECS OR SOME NICE AFTERMARKET HEADS. JOHN OH... I WOULDN'T USE THOSE MISMATCHED HEADS EITHER. THEY MAY WORK OK... BUT I'D NEVER FIND OUT. __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST Last edited by junkyardjohn; 01-26-2006 at 05:28 PM.

01-26-2006, 06:00 PM	#3
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: Advice on heads...please. You can mismatch them as long as you aren't trying to put a 63 cc head on with a 73 cc head. They were mismatched from the factory sometimes and deffinately over time. If you are going perf the votrecs are a good chioce if you are not going with a lot of lift (.450 is the max, some push it to .500) I have two or three sets of the double hump heads and I love them. Dollar for dollar you can go through a set of double humps for about the same money as the vortecs ($500ish) I just like the duble hump look!!

01-27-2006, 12:10 AM	#4
thejoker Registered User Join Date: Jun 2005 Location: Gulfport Mississippi Posts: 364	Re: Advice on heads...please. Thanks for the replies. I would like to go with the Vortecs but demand is one problem and the other is fitment with the intake I have. I really want to stick with the intake I mentioned above. Both of the heads I have are 73cc heads and I want to go with some 63cc heads. JKR __________________ **Have you ever danced with the devil in the pale moonlight....I ask that of all my prey** 68' C10 Short Step (rebuilding as we speak) 72' Custom Camper (wrecked, parting out) 79' C10 Fleet (rough, parting out) 97' C1500 Short Step Custom (DD) 97' Kawaski VN800a Customized 99' Z71 Silverado 04' Suzuki Volusia

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