410 carbs?
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410 carbs?
I have a 410 stroker that I am working on rebuilding the top end. It allredy has heads from a 428, intake manifold and carb.. I picked up a 2X4 lowriser intake manifold with 2X500 CFM Carter AFB Competition Series Carburetors.
How much carb can the 410 use? How far can I jet the carbs down, to save a little on gas?
How much carb can the 410 use? How far can I jet the carbs down, to save a little on gas?
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Dual 4bbls and you are worried about gas?
You can run the engine a little lean, but you'll just have to go down one step at a time and read the plugs. Too lean, it won't run right, and you'll get misfires, burn a valve, hole a piston if you like.
14.7 : 1 is the magic number for air to fuel. You can run richer, maybe a little leaner, but you're not going to gain measurable MPG with jetting changes on a 2 x 4bbl set up, unless it is currently way rich.
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You can run the engine a little lean, but you'll just have to go down one step at a time and read the plugs. Too lean, it won't run right, and you'll get misfires, burn a valve, hole a piston if you like.
14.7 : 1 is the magic number for air to fuel. You can run richer, maybe a little leaner, but you're not going to gain measurable MPG with jetting changes on a 2 x 4bbl set up, unless it is currently way rich.
Stand by for more replies.
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The build was done back in the late 70's. The original owner died about 3 years ago, and the Guy I bought it from (the "step son") wasent much help. All he knew for shure was that it was the original 360 block and it, and it was stroked out to a 410 with a 428 crank.
As I tore into the engine last year I found 428 heads and intake manifold too. I would assume that he went ahead and put the cam in it too. Dident have time to check the compression ratio, I put a pushrod in wrong and bent it!! Took 4 days to get the pushrods ordered!!! It dose have really short pushrods in it though, dont know if that tells you anything or not!
As I tore into the engine last year I found 428 heads and intake manifold too. I would assume that he went ahead and put the cam in it too. Dident have time to check the compression ratio, I put a pushrod in wrong and bent it!! Took 4 days to get the pushrods ordered!!! It dose have really short pushrods in it though, dont know if that tells you anything or not!
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Joined: Mar 2004
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From: Union, Washington
These are air valve carbs, the work so that the end result is just like Holley vacuum secondary carbs and the secondaries will only open as far as engine demand, so sure you can run them, BUT and it is a big BUT with a 2 X 4 setup you will stick your fat foot in it often to just hear it sing, so don't bother with down jetting anything. Just run it. If you want to save fuel, keep the original carb and wire the secondaries closed.
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How would my 410 run with the dual quad set up if it was still running the stock cam that came on the 360FE in 74', compared to running a cam out of a 428? How do I date what year 428 my heads and intake manifold are from? I am assuming that all parts came from the same 428.
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Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
How would my 410 run with the dual quad set up if it was still running the stock cam that came on the 360FE in 74', compared to running a cam out of a 428? How do I date what year 428 my heads and intake manifold are from? I am assuming that all parts came from the same 428.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
Well, the C4 is a 1964 head and can't be a 360 as there were none then. The 6090G is just the designation for a head. A 428 was around from 1966 thru 1970. So the first digits will be C6, C7, C8 or C9.
Post Fiend
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From: Union, Washington
The "A" means it came from a Galaxie, other than that no. but C4 heads will have large ports. That does not mean hi-performance just that early heads had big port. The engineers found out later that for street motors smaller was better because the fuel/air mixture maintained a higher velocity.
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BTW, Bear, feel free to show us a C9 head casting. And, from your previous post, the CJ head was derived from the Low Riser, not the Medium Riser.
draggin' the line
Post Fiend
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From: Union, Washington
No, "6090" is the designation for a head casting. The "G" is is the revision level. The C4-G head is a standard part for '64-'65 352 and 390 engines, with 2.02 and 1.55 valves. Larger valves can be installed, if the build warrants it.
BTW, Bear, feel free to show us a C9 head casting. And, from your previous post, the CJ head was derived from the Low Riser, not the Medium Riser.
draggin' the line
BTW, Bear, feel free to show us a C9 head casting. And, from your previous post, the CJ head was derived from the Low Riser, not the Medium Riser.
draggin' the line