What size are std efi inlet ports

[darky82]

Hi, wondering if any one has info on 5.0L efi inlet manifold intake runner sizes looking at buying a ported inlet manifold but the port size is 28mm x 50mm with a 70 mm machined thottle body, i measured my old gasket and its 31mm x 63mm my stock manifold seems bigger or is that just how big the gasket spacing is

[mr j-man]

Hi, wondering if any one has info on 5.0L efi inlet manifold intake runner sizes looking at buying a ported inlet manifold but the port size is 28mm x 50mm with a 70 mm machined thottle body, i measured my old gasket and its 31mm x 63mm my stock manifold seems bigger or is that just how big the gasket spacing is

maybe measure ya stock manifold...if uv still got it! i just had mine off to do the gaskets but its all bolted back down now...sorry bud!

[sporty custom]

my stock manifold was 26x50

[darky82]

thanks champ..

[Commydoor]

i thought porting heads and manifolds was to bring the outlet shapes out to the gasket measurements to give a cleaner and higher flow of air...your not gonna gain much with a 2mm increase on one dimension only...just bolt up the 70mm throttle to your standard manifold, the gains will be about the same anyhow and cheaper...

[soop]

Not much gain with 2mm?
Totally depends where you take the material from.

[immortality]

Not much gain with 2mm?
Totally depends where you take the material from.

or loose if you take it from the wrong spot

[darky82]

Think i will just get mine done to match, got my heads today and they are 32mm x 50mm , was looking at the intake chanber and there seems to be still a bit of meat on the sides just inside the opening, can this be removed with no side effects or is it not worth the hastle

[Commydoor]

Not much gain with 2mm?
Totally depends where you take the material from.

i think you missunderstand what ive said but you do carry on dont you...please give me the benefit of your wisdom as to why 2mm is a substantive gain for the cost involved...and dispute that matching the heads and manifold to the gasket size doesnt give better or cleaner flow...

[ari666]

substantive

we making up words now?

2mm could be loads. could be a gain of a few cc's if it was somewhere where it shouldnt be. but all depends on the final shape and finish of the port.

[Commydoor]

ari666 we making up words now?


sub·stan·tive   /ˈsʌbstəntɪv/ Show Spelled
[suhb-stuhn-tiv] Show IPA
–noun Grammar .
a noun.
a pronoun or other word or phrase functioning or inflected like a noun.
of considerable amount or quantity.
possessing substance; having practical importance, value, or effect: substantive issues under discussion.

[ari666]

lol, looks like i just got shot down...

[Commydoor]

lol...when i looked back at it i was like shit maybe its not a word i had to go look it up...what i was trying to say was that yes i know 2mm would be a gain but it wouldnt be much of a gain compared to porting both head and inlet to the size of the gasket...ppl gotta work to a budget but if your going to buy a ported manifold and pay good money for such a small gain then it would be cheaper to just put a 70mm throttle on by itself...

[sporty custom]

70mm throttle body but the openining on my 5ltr manifold only about 68mm cant see the point cant see the point in putting 70 mm on it rather just polish throttle body. its like having a bigger funnel the hole can only take so much i made a gain by polishing mine but every car is different.

[darky82]

Ok cool thanks....

[Blown V6 Hatch]

70mm throttle body but the openining on my 5ltr manifold only about 68mm cant see the point cant see the point in putting 70 mm on it rather just polish throttle body. its like having a bigger funnel the hole can only take so much i made a gain by polishing mine but every car is different.

Do you know how much room the throttle shaft/blade takes up even at WOT? A lot more than 2mm....

[immortality]

.what i was trying to say was that yes i know 2mm would be a gain but it wouldnt be much of a gain compared to porting both head and inlet to the size of the gasket...

the problem is that the standard gaskets may well not be the optimum size or shape. if you have had the heads cleaned up then port matching isn't a bad idea between the intake manifold and head ports.

[darky82]

Thats what i was thinking, 7mm wider is a bit in size on my new heads ,im only going stock balanced crank and rod with .040 slight dish pistons they are from a 308 i think they will fit but lower comp a touch but was going to get the block decked a bit, im on a small budget