Here's the plan... I already got my Walbro 340 on the way. I want to make 525 rwhp give or take 25, somewhere in that range. I plan for a 383, don't know about the heads yet but 12# from the S-trim and 224/236 cam. I know that's very general but what are people with that hitting? The plan is to finish this next round of mods (power pipe, AC delete, fix exhaust leak, hooker muffler, rag joint eliminator, 52mm throttle body, Walbro 340) this week and then start saving up to do the cam, rr's, springs, locks/retainers, pushrods. I was planning to leave the stock heads on until after I did the bottom end. What kind of numbers will I see on a stock headed, cammed, blown 383??? Can I reach my goals with a 355??? What compression ratio should I go for? To reach those numbers, do I need to go aftermarket head castings or hogged out stock castings??? I'm trying to make the car stay street/emission legal. That's the only reason I have shorties... I want to try to keep it that way even it will limit me some. Will that cam have trouble passing smog??

Anybody have any advice or tips or anything, please elaborate. Only other car I've had other than my T/A is a station wagon so this whole car has been a major learning process. I learn more every day, I'm trying to learn even more right now I mean just with this 6# the car feels really strong but it's nowhere close to what I want. If I am completely off with what I'm thinking, please tell me what I need to do. Most of my mods are in the sig... Thanks.

 

We got a few folks hitting 500rwhp on stock bottom, Cmotorsports stage II heads, 224/236 CC, and 8psi on a D1. So you should easily hit that number with your future setup. You should definatly not put stock heads on a stroker, let alone a boosted one. They are way to restrictive to work well in that situation.

Mav

 

You won't see that kind of hp with stock heads. I had a similar setup at one time and made ~475rwhp. The most cost effective solution is ported stock castings. if you are going for high boost, AFR heads are a big plus. The large chambers allow for an appropriate CR (~8.5:1) and the thick deck promotes gasket retention. This will cost you another ~$1,500 though.

I don't know what kind of emissions testing you have where you are, so it's hard to say about passing. I am a green kind of guy and my setup has full emissions equipment. We do not have tailpipe testing here, but I had mine tested out of curiousity. With a 214/224 cam it passed easily.

Ceramic coated piston crowns are something to consider when you do the buildup. Mine looked fine after two years and 8,000 miles of high boost (14psi) plus nitrous at the strip when we tore the motor down this year. The pistons are JE "Extreme Duty Inverted Dome" and I am reusing them they are in such good shape.

Rich Krause

 

hmm...

I know of a real close friend of mine that put down 522 with a 224/236 cam p600-b pullied for 12# 2-core i/c,1.6rr,STOCK heads,and longtubes running about 22 degrees of timing. i dont see why you shouldnt hit those numbers your wanting with a 355.

 

Hmm, lose specs look pretty close to your car, there, Mean.

 

Well, my cam was smaller than that (214/224) but I can't see gaining 50rwhp just by swapping the two cams. Also, 22 degrees of timing? I have never seen anything like that setup/tune make 522rwhp and I have seen a lot of cars on the dyno. OTOH, if it were made with a dead cold motor under ideal conditions, it might be possible. My numbers refer to a warmed up motor with hp corrected to the ~1,600ft density altitude that is typical around here.

Rich Krause

 

I don't know about that goal, at least with a 355 and stock heads.

I'm running a forged 355 with ported stock LT1 heads (larger valves, 1.6 rr's etc.), a 218/230 cam, Vortech (6 psi pulleys), 36 lb injectors and a custome tune (although it is a conservative mail order tune). It passed the California (I see that's your home state) emissions with no problem but at only at 462 rwhp. That's a long way from 550 or whatever you were looking for.

 

"only at 462 rwhp" haha that's any oxymoron right there...

 

I think you know him, is name is CJ. Made 522 with stock heads and a 224/236 cam and all the othet boltons on 22 degrees of timing. 12#pulley on p600

 

Can it be done, yes, assuming that the S trim can move enough air to do it. Really, it's all about moving enough air to make the HP.

To get there with stock heads you'll have to use a bigger cam, about the same cam in a 355 or 383. With the 355 you'll want your HP peak just over 6K rpm, with the 383 you'll want it at about 5600-5700rpm (and you'll want pulleys that will turn the blower fast enough to pump that amount of air, basically a little less then 900cfm@11psi, can an S trim pump that much?). To get this to work you’ll need a great exhaust, but with the right cam selection not necessarily long tubes. I doubt that you’ll pull it off blowing through cats though.

Better heads or an aftercooler/intercooler will make it a much easier goal to reach