Big improvement from intake/head swap

[Rhedalert]

After installing the roller heads w/LS6 valve springs, 3400 lower and upper manifolds onto the 3.1, I noticed a power increase, but I had nothing to base it on. Well my mom has a '95 Cutlass Supreme as well (sedan) and I was driving it today and noticed it felt quite a bit doggy compared to mine. Back when my car was all stock it felt the same. Well I figured let me pull out the Gtech and do a few runs. When stock, I had a best of about 16.8 (I writeoff the trap speed times Gtech displays as always above what it should be. Noticed that with all the cars I've gteched) and an average time of 17.0@83

Took it out tonight and I get these numbers:

1st run: 15.8@92
2nd run: 16.3@88 (wheelspin)
3rd run: 16.1@90

Fucking nuts. The only other difference is I have a cone filter on for schits and giggles. In about a week I'll recheck it with the stock box, but still DAMN I didn't think changing those parts would make that big of a difference. Now I gotta see what opening up the exhaust will do. Just wanted to share as proof that the upgrade is definetly worthwhile.

[blackbombshell95]

RE: Big improvement from intake/head swap

thats amazing. ur getting good times. !!!!!

i'm doing the same but P&P everything. and a cam. already have a 2.5'' catback. i wonder what kind of times i might get. i'm currently getting 16.5 with a huge speaker box in the back.

[Rhedalert]

RE: Big improvement from intake/head swap

YEah it's just too bad there's no open track to get true numbers from. But I'm really just using it as a guide for comparison. Same car, same Gtech.

I'm going with 2.5" including the downpipe (stock is friggin 2") and cat, after the cat will be 2 1/4 which then splits into dual 2" (GM piping) I just need to prep the dual exhaust bumper, get the cat in the mail, get the downpipe made up, etc

[gpse3400]

RE: Big improvement from intake/head swap

Well it did actually spin up the tires with me in it....Forgot to tell you I was kinda shocked at that....maya

[Doubt_Incarnate]

enyone ever hybrid a 2.8? i know the torque wouldnt be there, but the additional air flow would definatley help that dated motor.

[Rhedalert]

Re: RE: Big improvement from intake/head swap

Well it did actually spin up the tires with me in it....Forgot to tell you I was kinda shocked at that....maya

Yeah! And I did a brake-torque start in the middle of Wm Floyd Pkwy and the wheels wouldn't stop spinning. Then it went into 2nd gear (Thanks to the 440-T4...E) I had to cancel that run. LOL Sheltie.

[Rhedalert]

enyone ever hybrid a 2.8? i know the torque wouldnt be there, but the additional air flow would definatley help that dated motor.

As far as a stock 2.8 block goes, you'd probably be the first to do it.

[SappySE107]

no, a beretta owner has done the swap onto a 2.8, along with a large shot of nitrous (i wanna say 250 but maybe it was 150-200).

[Hybird]

You said you installed roller heads? Do you mean just roller rockers? or do you have roller lifters now too. Times look good though.

[Rhedalert]

All 3x00's have roller lifters. I installed heads meant for the roller rockers. They have the guides (slots) where the rocker arm bolt goes.