Need a Mathematician !

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Need a Mathematician !

Post  Frank Merkl on August 5th 2016, 8:00 pm

the Question is if I put a 10.300 deck intake on a 11.200 deck block how thick would the spacer pates need to be on C460 heads for the ports to line up?
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Re: Need a Mathematician !

Post  cool40 on August 5th 2016, 8:59 pm

.900..... study scratch I may be thinking backwards! Laughing cutting a head .005 you take .010 off the intake.i think... Laughing
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Re: Need a Mathematician !

Post  Super Snake Steve on August 5th 2016, 10:40 pm

Can't you just lay the intake on with shims till the holes line up and thats how thick the spacers need to be

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Re: Need a Mathematician !

Post  Frank Merkl on August 6th 2016, 2:54 am

I'm busy trying to farm and my water jet guy is twittleing his thumbs ! somebody give me a number ! something in the ballpark! Professor Charlie ? Lem ?
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Re: Need a Mathematician !

Post  460bronco on August 6th 2016, 9:56 am

needs a .900" spacer. Since the head mounting surfaces are 90* to each other, and each is raised .900", an intake spacer of .900 on each side should work. If you know the exact deck height of the block the intake was fitting on and the exact deck height of the new block, then the spacer should just be the difference in the 2 deck heights.

Never actually done this swap before, but this is what it looks like the spacer should be by the numbers.
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Re: Need a Mathematician !

Post  FalconEh on August 6th 2016, 12:50 pm

Would the measurement not be adjusted for the gasket thickness also, I belive my yates 351 spacer were machined thinner on the port side Question
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Re: Need a Mathematician !

Post  FalconEh on August 6th 2016, 1:54 pm

The heads/intake relationship is 45^ each for a total of 90^ when measured from the cylinder bank or 45^ from the upper rail to the heads (intake surface) it is a 90^ relationship only when measured from one surface and only one side (45^) is being altered.
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Re: Need a Mathematician !

Post  Frank Merkl on August 7th 2016, 12:04 am

I'm going to get some 1/2" plates water jeted up , I know the bolt holes won't line up but I figure with any luck I can use the stock holes to hold the plates to the heads and have enough room the thread the plates for the intake ! this will take a lot less time than Building a New Intake From cratch and the A460 Sheet aluminum intake for 11.200 deck I think the runners are too small for the 712
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Re: Need a Mathematician !

Post  cool40 on August 7th 2016, 12:52 am

I'm pretty sure .900 not talking gaskets into consideration would be where it'd need to be. With a pair of .060 gaskets .780 would do or 3/4 plate would be easier, IMO. You can always fly cut them down to fit perfectly if they're too thick. Wink
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Re: Need a Mathematician !

Post  Frank Merkl on August 7th 2016, 2:47 am

Talk to my "Water Jet Guy" . getting a sets made , .375" ,.500". .625", .750" .875"and 1.00" . should have something that will work!! be Done Tuesday!! lol
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sucks when the oil patch is dead up here , but you can get work done and get a deal on pricing!!
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Re: Need a Mathematician !

Post  Doug Rahn on August 7th 2016, 7:08 am

Frank, I'm no math wiz but I'm pretty good on drawing. I did a quick drawing using a block front I have on file and added the 11.20 deck height and this is what I came up with. Also this is not allowing for any gasket thickness. Hope this helps. .880" between intake and cylinder head and .6223" between the intake front and rear china walls.



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Re: Need a Mathematician !

Post  DFI429 on August 7th 2016, 7:22 am

Doug Rahn wrote:Frank, I'm no math wiz but I'm pretty good on drawing. I did a quick drawing using a block front I have on file and added the 11.20 deck height and this is what I came up with. Also this is not allowing for any gasket thickness. Hope this helps.  .880" between intake and cylinder head and .6223" between the intake front and rear china walls.

Doug, I think you're right on..  But on the many thoughts of gasket "allowance", I think everyone is over-thinking that point..  Intake manifolds are manufactured with the required "gasket clearance" so to speak, so when stepping up deck height, as long as the geometry is maintained the "gasket clearance" still exists.. right?  scratch
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Re: Need a Mathematician !

Post  Doug Rahn on August 7th 2016, 7:28 am

DFI429 wrote:
Doug Rahn wrote:Frank, I'm no math wiz but I'm pretty good on drawing. I did a quick drawing using a block front I have on file and added the 11.20 deck height and this is what I came up with. Also this is not allowing for any gasket thickness. Hope this helps.  .880" between intake and cylinder head and .6223" between the intake front and rear china walls.

Doug, I think you're right on..  But on the many thoughts of gasket "allowance", I think everyone is over-thinking that point..  Intake manifolds are manufactured with the required "gasket clearance" so to speak, so when stepping up deck height, as long as the geometry is maintained the "gasket clearance" still exists.. right?  scratch

I often wondered about that, just never knew that for sure. I'm sure some of the old guys on here like Randy, Lem, and Charlie can answer that, hahaha!
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Re: Need a Mathematician !

Post  DFI429 on August 7th 2016, 8:07 am

Doug Rahn wrote:I often wondered about that, just never knew that for sure. I'm sure some of the old guys on here like Randy, Lem, and Charlie can answer that, hahaha!

Lol.. Thinking about it a bit more, we now need to add (or subtract) the allowance for an additional set of gaskets when using spacers..  Almost overlooked that part drunken
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Re: Need a Mathematician !

Post  cool40 on August 7th 2016, 11:31 am

It will depend on every piece involved. If the heads or block have been cut any or even the intake. I run plates on the old 400 with 351c top end and just glued them to the head and used gaskets on the intake. He should have plenty of choices looks like. Laughing
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Re: Need a Mathematician !

Post  Frank Merkl on August 7th 2016, 7:31 pm

Thanks Doug!!! that's what I needed!! .875 it is!
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Re: Need a Mathematician !

Post  Lem Evans on August 7th 2016, 8:49 pm

cheers Doug is the man.

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Re: Need a Mathematician !

Post  bosshoss on August 8th 2016, 6:59 pm

Maybe think about adding .065 for your old gasket and then getting your guy to cut grooves for orings on both sides. Never buy another intake gasket.
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Re: Need a Mathematician !

Post  Frank Merkl on August 23rd 2016, 8:43 pm

.875 worked out perfect!! Thanks Doug !!


Port alignment is great! and no more worrying about stripping out the 2 corner bolt holes that go into the pushrod holes . going to dowel the adapter to the head and counter sink the bolts for the plate , put new intake bolt holes threads in the plate and it also gives me some where to put 1 more kit of nitrous!!! Yea Ha !!
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Re: Need a Mathematician !

Post  Mike R on August 23rd 2016, 10:05 pm

Damn, that's a lot of pop cans Twisted Evil

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Re: Need a Mathematician !

Post  Frank Merkl on August 24th 2016, 12:36 am

Sure is !! cost me $750 for a 2' x 3' piece of .875 aluminum , had him water jet 4 pieces out which he charged $50 ,but I have enough material for 3 or 4 more
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Re: Need a Mathematician !

Post  Doug Rahn on August 24th 2016, 10:20 am

You're welcome Frank. Glad I could help and contributed a little to the cause. Way Cool!
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Re: Need a Mathematician !

Post  cletus66 on September 1st 2016, 2:35 pm

Doug Rahn wrote:
DFI429 wrote:
Doug Rahn wrote:Frank, I'm no math wiz but I'm pretty good on drawing. I did a quick drawing using a block front I have on file and added the 11.20 deck height and this is what I came up with. Also this is not allowing for any gasket thickness. Hope this helps.  .880" between intake and cylinder head and .6223" between the intake front and rear china walls.

Doug, I think you're right on..  But on the many thoughts of gasket "allowance", I think everyone is over-thinking that point..  Intake manifolds are manufactured with the required "gasket clearance" so to speak, so when stepping up deck height, as long as the geometry is maintained the "gasket clearance" still exists.. right?  scratch

I often wondered about that, just never knew that for sure. I'm sure some of the old guys on here like Randy, Lem, and Charlie can answer that, hahaha!


I just turned 50 in June.  Do I get to be counted as an old guy yet, or am I still considered to be a juvenile delinquent?  Laughing
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Re: Need a Mathematician !

Post  res0rli9 on September 1st 2016, 3:51 pm

cletus66 wrote:
Doug Rahn wrote:
DFI429 wrote:
Doug Rahn wrote:Frank, I'm no math wiz but I'm pretty good on drawing. I did a quick drawing using a block front I have on file and added the 11.20 deck height and this is what I came up with. Also this is not allowing for any gasket thickness. Hope this helps.  .880" between intake and cylinder head and .6223" between the intake front and rear china walls.

Doug, I think you're right on..  But on the many thoughts of gasket "allowance", I think everyone is over-thinking that point..  Intake manifolds are manufactured with the required "gasket clearance" so to speak, so when stepping up deck height, as long as the geometry is maintained the "gasket clearance" still exists.. right?  scratch

I often wondered about that, just never knew that for sure. I'm sure some of the old guys on here like Randy, Lem, and Charlie can answer that, hahaha!


I just turned 50 in June.  Do I get to be counted as an old guy yet, or am I still considered to be a juvenile delinquent?  Laughing



YES YOUR AN OLD FART Razz

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Re: Need a Mathematician !

Post  Wayne Pearce on September 1st 2016, 5:45 pm

From were I'm standing, he's a "youngster", I'm 73 going on 21!

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