All valid points, but I think this is about long term budget. Yes, 306 is a little cheaper right now, but in two years he is going to want more cubic inches. Then he has to start over.
Now, of this was a choice of 306 with aluminum heads vs. 331 with iron heads, then I would say go 306. But, it looks like he will be stuck with iron heads either way, so that is really irrelevant.
Exactly
Way easier to add the topend later. Than being limited by smaller displacement. Umm MM&FF also have done articles showing the power differences between 306-347 builds with the "same" topend kits
I'm sorry but more displacement has more potential for hp. Why is 347 in your on screen name if you don't believe in displacement? And who said anything about expense being better? That's true no matter which direction you're talking about. More expensive heads/displacement. And as for the "new" 5.0 making 400 hp who cares. They also build a 5.8 for the cobra. Why did they do that? Why not just put the blower on a 5.0? I just don't agree about a 306. I believe in displacement that's why I'm going to build a 9.5" deck motor
$1350 got me a completely balanced rotating assembly. It was a cast Scat crank, still stronger than the stocker. 4340 forged rods, SRS forged pistons, chrome moly rings and clevite bearings. That also included a new balancer and billet flywheel, oh yeah, and shipping. BTW, no notching needed with Scat i beams on a 331, so no difference in machining cost with 306 vs. 331.
OP, what are the odds that you will be able to add a "better" topend in the near to not so distant future? If the odds are in your favor that you will be able to afford the "goods" shortly maybe stroke it and deal with a topend later. But if I were in your shoes it'd pretty much be a one shot deal. So I'd prob build the best motor i could with the parts I had or could afford. So that being said if I was building it and had a set of gt40s to use I'd go with the 302. I likke to dream now and again but when its a "one shot deal" it is what it is, there's no afrs in the near future (for me). Hope I made any kind of sense , I knew what I was trying to say maybe just didnt articulate it very well(2am). In closing, only you know your financial situation and patterns. If you have the same coming in and going out each month and gt40s are what you can afford go with the 302/306. If you feel that in the near future you will come into a winfall maybe build a build with some growing room, ie: 331 347
Yes what he said. Another thing I'm curious about is how much room for the required long tube headers when using p heads is there in the factory 5, is it ample or is it pretty tight in there?I'd be worried about this too.
No matter how you slice any of these plans, none are really good.
I think the real difference is that if you build (IMO buy) a 302 and put aluminum heads on it, even if the future never comes, you will still have a pretty kick ass setup in a light car that pretty much flies.
If you build a 347 and you never get around to the heads, it will always be a mediocre, disappointing, unfinished project.
The only solid plan would be to build the 347 from the ground up on a stand and finish it with the permanent parts, not temporary ones.
Ran across this engine shopping for a customer. I think the hp number is a little high for an iron head engine, but it's still a killer deal. Comes with a warranty too.
http://shop.advanceautoparts.com/we...ionPath=L1*14923|L2*15031|L3*16033#fragment-1
Kurt
No way would I recommend a ATK engine. Too many horror stories. Scat cranks are hit and miss. I would have them checked out before putting them in a car.
K
Done a few ATK engines. Haven't had too many problems. It's a standard rebuilt engine, nothing special. Anything that comes out of China is only going to be as good as whatever they recycled it out of. If they were melting down good dish washers that week, you might get a good crankshaft. If there were still a bunch of dishes in them when they turned on the furnace, good chance your crank will break.
Kurt
And you should get a better cam. If you are def staying with the e303 then I guess the tfs 170s aren't a big deal because you'll be limited by that cam
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