468 SBC tall deck engine build
Thread Starter
Melting Slicks
Joined: Mar 2002
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From: S.L.C. UT
Le Mans Master
Joined: Oct 2002
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From: Las Vegas - Just stop perpetuating myths please.
Man that's an awesome machine. You are on the limits of small block Chevy. I think that build is not for beginners. Is it race only now? Street use at all? Pump gas? Have to ask what size are the header tubes? Did use an adapter plate?
Thx for sharing!
Thx for sharing!
Team Owner
Joined: Aug 2004
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From: Park City Utah
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Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
These tall decks probably aren't for beginners. There are alot of different issues you run into. The cam is raised .391, the pan rails are spread .400, there is no oil filter mount, so you have to use a remote oil filter. The distributor is at a 5 degree angle instead of a 4 degree angle. So the dist pad on the intake needs to be machined. And you need a adjustable slip collar on the dist, so it will go in deeper into the block. And of course, you need intake manifold spacers to reuse the standard deck height intake manifold, since the engine is now taller and wider. And with a roller cam, you need to find a timing cover that is set up for a raised cam. This Cloyes timing cover actually has a cam button in the cover for a raised cam tall deck.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
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From: Las Vegas - Just stop perpetuating myths please.
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
Le Mans Master
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From: St. Charles MO
Are you really going to start that line of ignorant crap again in a thread that has nothing to do with it?
Le Mans Master
Joined: Aug 2015
Posts: 6,125
Likes: 2,000
From: St. Charles MO
[QUOTE=cardo0;1597296767]
That's not the line of crap I was referring to. You two can take that offline and use PMs for that stuff. I'm referring to the continued disinformation about how intakes work vis-a-vis Helmoltz resonance, single-plane vs dual-plane intakes, and the success vs production numbers of certain intakes. You know, all the stuff you're wrong about. Our members here need accurate information, not silly misinformation. So if you can't help yourself, then at least don't **** up new threads with this crap.
And as far as a line of crap you also forgot who admitted to using personal attacks and insults before he removed them to hide the fact. Well I haven't forgotten!
Last edited by H P Bushrod; May 30, 2018 at 01:16 AM.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,108
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From: S.L.C. UT
Here's a couple more. I got it on true TDC to double check my adjustable timing pointer. Then degreed the cam afterwards. I forgot to get pics of the degree wheel on it. But I degreed the cam the first time, and it was right on the money again this time. But it is the same cam.
Team Owner
Joined: Aug 2004
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From: Park City Utah
You mentioned earlier that the cam is raised. Is that specifically to clear a bigger arm crank, or does that solve other valve train geometry at the same time? I'm not exactly sure how raised cam helps valve train geometry, but I believe I've read about that previously. This way outside of my realm of expertise.
Also, Are the lifters offset? It looks like the push rod cups are offset, but as much as the rockers? I see that the rocker arms are...I'm guessing to clear larger intake ports? It looks like the exhaust is offset slightly in the other direction...is that b/c of valve size? If you don't mind, I'd love to hear more about the valve train. You're truly taking the SBC where it was never intended to go. I dig it.
.
Also, Are the lifters offset? It looks like the push rod cups are offset, but as much as the rockers? I see that the rocker arms are...I'm guessing to clear larger intake ports? It looks like the exhaust is offset slightly in the other direction...is that b/c of valve size? If you don't mind, I'd love to hear more about the valve train. You're truly taking the SBC where it was never intended to go. I dig it.
.
Last edited by Tom400CFI; May 29, 2018 at 05:38 PM.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
You mentioned earlier that the cam is raised. Is that specifically to clear a bigger arm crank, or does that solve other valve train geometry at the same time? I'm not exactly sure how raised cam helps valve train geometry, but I believe I've read about that previously. This way outside of my realm of expertise.
Also, Are the lifters offset? It looks like the push rod cups are offset, but as much as the rockers? I see that the rocker arms are...I'm guessing to clear larger intake ports? It looks like the exhaust is offset slightly in the other direction...is that b/c of valve size? If you don't mind, I'd love to hear more about the valve train. You're truly taking the SBC where it was never intended to go. I dig it.
.
Also, Are the lifters offset? It looks like the push rod cups are offset, but as much as the rockers? I see that the rocker arms are...I'm guessing to clear larger intake ports? It looks like the exhaust is offset slightly in the other direction...is that b/c of valve size? If you don't mind, I'd love to hear more about the valve train. You're truly taking the SBC where it was never intended to go. I dig it.
.
With the AFR heads, the bigger heads AFR 227, 235, and 245 heads have a 60/40 valve split. So you end up with a offset exhaust rocker. The 245's require a shaft system because intake port is bigger, and has no pushrod pinch.It has a 2.125 intake valve. So you have to use a shaft system because the offset is so great. There are two ways to do it on the 245's. With a .550 offset, you can use a regular lifter. Or you can use a .450 offset and a .180 offset lifter. I had this shaft system I was going to use on a 409 build and some AFR 227's. I ended up getting it for a good price. So I used offset lifters so it would work on the 245's.
One additional note, the AFR 227 or 235 would use a .450 offset if your going to use a shaft system
Last edited by tpi 421 vette; May 30, 2018 at 09:42 AM.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
That's pretty neat. I love "puzzle solving", and you've done that with a combination of parts. It helps (obviously) that you're familiar with all the dimensions, options, etc to put together a system that allows you to run essentially BBC sized parts on a SBC. Thanks for the detail! 