I posted this question but havent gotten any responses, i have a 388 cid with 8.5 compression, im gonna spray it, i want to put it under my 86 tpi with a cam i already have purchased for the prodject, 236/230 624/620 on a 114, what kind of computer issues am i gonna have? what kind of probs with running etc. , have th350 behing it with a 3500 stall , but dont want took much computer issues, is there a better cam that still has descent lift but smaller duration out there? or can i make this billet hydraulic roller i have work?

 

https://www.thirdgen.org/techbb2/sho...hreadid=264356

Take a read at that thread. That's an awful lot of lift for that given duration. Valve train wear will be at a high.

 

ok, well i read that thread and it gave me some interesting points, i failed to mention i am running gm fastburns with 2.08/1.65's with springs good up to 650 lift, the heads i have flowed 310 int/ 218 exh @600 lift. from what i know they are pretty good even for fastburns, my main ? is what kind of computer and running issues am i gonna have?

 

a stock 1986 TPI ....with them cam specs . You do realize that intake setup runs out of air at 4800 rpm's right ? If your plan is that stock TPI .... computer problems arent what you should deal with first . It's going through a MAF correct ? A stock one flows around 450ish CFM . YOu need more than that I am guessing for that setup . What's the topend on that cam ( rpm's) I bet its way over 4800 rpms.



Call compcams .....tell them what you want to do ...they will give you a cam for what you want

 

It will run out of air sooner than that.

My 355 w/ TFS heads runs out of air at right at 4K. W/ the added air requirements of the 383, you may be lucky to get that far.

 

so do yall guys suggest i change intakes? maybe the hsr or the tpis lt1 style or what do yall suggest? what intake gives the most air? is there a different maf system that can be used?

 

For the most part, any aftermarket intake will be sufficient. Maybe even the LT1 conversion. Of them, not sure which would be better. Probably a shorter runner design such as the Stealth Ram or Super Ram (I think, I may be getting them all confused).

A cam like that would definitly favor a short(er) runner, though.

Try a search, if you haven't already. Get a feel for what kind of combos people are running with what and the results they are getting.

 

yeah that is kinda why i made this post, want any of yalls feedback from people who have been there done that and had issues, so pretty much i can get by with stock ecm but am gonna have to maybe size down cams and get a better intake later, i was already thinking this cam might be a little much , i was thinking of calling comp and trading it out with something smaller with lift around 510-540 and duration under 220 on both sides.

 

yeah the tpis system is 895$, i think hsr manifold and fuel rails with regulator is like around 500$, i guess ill size down the cam, get it in the car under the tpi then see what happens and pick after that, i wonder how bad the tpi will run under nitrous?

 

Out of curiousity, what's the bottom end look like? Specifically the pistons?

 

coated weiscos, 30 cc dish for 8.5 to 1 compression, 6 inch manley racemasters, tfs steel crank, 4 bolt splayed and studded, it is a early 70's late 60's .010 block, made 650 hp on nitrous on the carbed setup but went with different pistons to do a efi turbo but got tired of all the crap to do the turbo so decided to put it under my tpi and spray it, but before i do i want to know what issues i will have, ill defineitely be prepared to upgrade the intake and probably will size down the cam

 

After you decided which you want to do ( upsize the intake ...or downsize the cam ) Call up a cam company . Like compcams , they will give you a pretty good recomendation for a cam .....even go custom grind . I have a custom grind picke dout from them ....and they still charged me an of the shelf price . As said before though ...do a search ( I hate hearing that too but .... ) check out the setup's people are running .... thne decide how radical you want to go

 

IMO, if you really want the most out of a setup, call Comp or someone and see what they can do as far as custom grinding goes. That gets you a cam taylored to YOUR setup.

 

well the cam that i have is a comp cam that was a custom grind billet from them for the original turbo setup. i just want to get something that is more tpi ecm happy

 

ok, well i called comp today and they gave me a couple of grind #'s to go with but they suggested i use a flat tappet cam so i dont have knock sensor issues. do you guys think that converting to a different intake would fix the lack of air problems or will i have to modify to a 730 ecm and ditch the maf? i would prefer to stick with the maf just for the simple fact of not having to convert if at all possible

 

I wonder why the suggested going to flat tappet to get rid of noise( knock sensor issues)???? What is the rest of your setup ?