I have a set of AFR 185 heads, I'll be ordering a custom cam, Holley Systemax II intake, 75mm TB
I think you should be more concerned with the top end parts you're putting on it. Those parts you listed...
... Are 302 parts, IMHO. You would probably stand to gain more by putting money in better flowing parts than you would the extra cubic inches. I would unquestionably be ditching the 185s and going after the AFR 205s and the biggest TB you can hog out that intake to match (which is probably an 80mm). Really, the SysteMax is a good intake BUT I would be considering an intake that can handle a 90mm TB, like a Trick Flow R or a Victor 5.0.
That said, if you haven't got it together yet, why not run the bigger pistons? There is no replacement for displacement. For argument's sake, let's say you make the exact same specific horsepower (hp/ci) out of each engine. Let's say you make 425 HP out of the 342 (1.24 hp/ci). That equates to 451 hp out of the 363.
While I agree w/ Nik on the old adage of no replacement for displacement,..if you bore that block to 4.125, AND if a cylinder wall is ever damaged by a (take your pick) broken ring, ring land, piston pin, connecting rod, etc. the "replacement" you'll end up dealing with is the entire block, as opposed to having to reserve capability to over bore it for that calamity should it ever arise. (or you'll have to have that cylinder sleeved). Boring it to capacity will make it more costly to repair, and given the smallish cylinder heads you currently have, will probably not warrant spending the money for the 363.
Lastly, I'm sure that a dart block has ample wall thickness to support the 4.125 bore, but I'm wondering if the engine will run hotter as a result.
They don't make no stinkin' dart blocks for a 4.6Mike, those Dart blocks will safely go to 4.185... So if you bung up your big bore engine, you can... make it a bigger bore engine. This gives you .060 over the 4.125 big bore which honestly IS more than you can safely overbore the stock 302. Dart blocks are a thing of beauty. And I want one....
Mike, those Dart blocks will safely go to 4.185... So if you bung up your big bore engine, you can... make it a bigger bore engine. This gives you .060 over the 4.125 big bore which honestly IS more than you can safely overbore the stock 302. Dart blocks are a thing of beauty. And I want one....
The AFR 205 can take advantage of the larger bore but id be looking at some other things as well. The larger bore can cause some detonation issues with the larger flame travel area amongst other things.
If the combo is right the extra cubic inches is good. Id prefer to see more then the 4.00" bore you have planned even with the AFR 185. I've sonic tested the DART, a 4.2" bore is possible. Most companies offer a 4.155" piston after that you get into custom. If you decide to change I have a set of Probe SRS pistons sitting on my shelf 4.125" bore if you can use them Ill let them go heavily discounted.
Mike, those Dart blocks will safely go to 4.185... So if you bung up your big bore engine, you can... make it a bigger bore engine. This gives you .060 over the 4.125 big bore which honestly IS more than you can safely overbore the stock 302. Dart blocks are a thing of beauty. And I want one....
The AFR 205 can take advantage of the larger bore but id be looking at some other things as well. The larger bore can cause some detonation issues with the larger flame travel area amongst other things.
If the combo is right the extra cubic inches is good. Id prefer to see more then the 4.00" bore you have planned even with the AFR 185. I've sonic tested the DART, a 4.2" bore is possible. Most companies offer a 4.155" piston after that you get into custom. If you decide to change I have a set of Probe SRS pistons sitting on my shelf 4.125" bore if you can use them Ill let them go heavily discounted.
They don't make no stinkin' dart blocks for a 4.6
Because of this, best way to get power out of a mod IMO is air stuffage....(Yay turbo!!)
I've heard about unshrouding valves but what exactly is involved with doing that? If I buy a $1800+ set of heads I'm not really going to be excited about spending MORE money on modifying a BRAND NEW set of heads...I don't really have that kind of money.This.. and the advantages of the 4.125 will mostly be gained by unshrouding the valves.. its better any way you put it.. you will still have tons of overbore room as well.
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They don't make no stinkin' dart blocks for a 4.6
I've heard about unshrouding valves but what exactly is involved with doing that? If I buy a $1800+ set of heads I'm not really going to be excited about spending MORE money on modifying a BRAND NEW set of heads...I don't really have that kind of money.
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