IMO a 346ci engine does not need a 225cc head. Look at you cam specs and factor in your displacement and rpm limit. Most 350s can make tons of power with a 170-180 cc intake runner. You'll lose torque with a head that big.

Just my .02

 

for my 355 AFR said those 210cc are the most id want, even at 7500 rpm and mid 5 power. the only way a 225cc head would work is if i planned on spinning to 8500+ and make 6+ on the motor alone and run a massive drag setup or huge jam.

 

I'm leaning most towards the 205cc runner intake size. I doubt i will go above stock displacement and should be happy with the mid-500 rwhp I can develop with the 346 as is.

 

Pfffffffffffffffft 550rwhp.....thats it?

 

?! easier said then done lol

 

Lol! Yeah, there are a few supporting cast members that will be needed later on, such as a beefed up 4l60e or 4l80e, along with the rear end. Tranny first I think. Rest of the set up 'should' be fine though.

But I know, I have small dreams. Happy at mid-5's... I'll be satisfied with having the second fastest f-bod in the group.

Or third fastest. Whatever.

 

i want a gen III small block for my 95 i want a 12 sec daily driver heh

 

225s would be fine if one was running boost

 

or if they were planted on a CR5 block.

 

This is why I don't do mail order anymore. If I can't pick it up local or C.O.D. I won't buy it. Personaly I'd rather pay more for a dealer to put up with all the BS then myself.

 

I just bought a 6.0l with the 317 LS6 style heads. Guys make crazy power with ~224 deg cams but I'm gonna carb it so imagine what a ~240 deg would do Tuning...throw in some bigger jets, **** the ls1 edit.

 

omg dude, you read my mind, thats exactly what i was gonna do, Gen III carb, just like that article i posted up a couple days ago. how much did you pick yours up for? there are a coupel LQ9's floating around on the market here, im gonna wait till i get my other stuff outta the way first though

 

Well, I've been talking to Tony Mamo from AFR and Tom Izzo from Speed Inc. for the past 2 weeks and I have made my decsion to get the 205 Mongoose heads with the 66cc chamber. Should bring my static CR to 10.2:1, or thereabouts (so a slight increase over stock). I'm upgrading the lifters to Comps, but staying with the stock rockers. Will be using the GM steel shim gaskets with ARP head bolts. There will be no milling of the deck. Keeping all .75" of it.

It should make decent power now with the 224 XER cam, and if I want to add a small blower in the future (say 8 psi max) the set up will be strong enough to support things (and the 114 LSA cam will help not to bleed off boost). Its similar recipe both have used on several cars to date, though not in an automatic. They figure the CR will be no worry at all as long as I am not stupid on the tune, and run the ARP bolts and GM gaskets. Especially with access to 93-94 octane. The 205 heads will flow more than enough to support the boost, and the 225s are not necessary in the least (though would help) and would be overkill for my current set up unless I want to spin my engine real high.

Best yet, I should get the heads in about 10 days from ordering. Beats the 6 months I was going to wait. Now I just have to complete hte order..

 

Good choice. I think the mongoose heads will hold there resale value much much beter than a shops "X" brand ported head.

 

agreed, good choice. too many AFR cars now though