98 Trans am Base Dyno tune
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
98 Trans am Base Dyno tune Hey guys, just looking for some opinions. Just got my base numbers, no tuning was done. Bolted on BBK Headers Ory and a electric cut out with the stock muffler. These were my results...
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
I have the sun coast creation Raptor hood and intake Box to make it a full ram air. Stock LS1 intake manifold Just Headers ORY AND a CUTOUT. I didn't expect those numbers.. I have 241 heads waiting to be ported and a Comp Cam to go in. Still looking for a cheap LS6 intake . I thought the AFR was lean But the tuner said it wasn't bad, am I still safe. Any opinions ?
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
I lucked into this cam from a friend, he went bigger so I got it for super cheap. Otherwise I would've stayed under 224 or lower. I have a question where did you get your porting supplies.. I see they have kits on summit but just want to check with someone that has down the 241s before.
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
Thanks a lot, My first LS1 build so I'm looking forward to it. I'm trying to keep everything GM spec.. I should have the everything ready buy this coming month, so I will definitely post my results. I welcome everyone's opinions and advice !
I lucked into this cam from a friend, he went bigger so I got it for super cheap. Otherwise I would've stayed under 224 or lower. I have a question where did you get your porting supplies.. I see they have kits on summit but just want to check with someone that has down the 241s before.
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
LOL Definitely. I got the basics to the thing that need be ported but for sure I would like to see your work as well. Thanks
Ok, you asked for it. lol. First one is stock, shame on GM! Look at the 1st pic, center of pic just to the left of valve stem area at the casting buildup. Now where machining ends for valve seat area the air flow there had to have major turbulence where the seat meets the bowl. I blended the seats to the bowls to eliminate small stuff like that. I didnt open up the runners or reshape them at all. I didnt cut down the rocker bolt bosses either. Second is tapering the guide bosses down to a point. This opens up the throat area and helps air flow through the tightest point in the runners. I personally believe it helps more on exhaust side due to air flow direction going out and hitting that flat table like area of material where the guides are pressed in. Rest are finished results.
Last edited by JRENIGAR; Apr 25, 2014 at 08:50 AM.
More pics. the last two are bad angles to show port work and more so to show 3 angle vj done after porting was completed. I have about 6 hours in port work on both heads intake and exhaust.
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
Very nice , where did you get you cutting bit ? I was told buy the machine shop to cut all the way around the valve guide and make it look like a bullet, and they said the best is that rocker boss and the exhaust side like you said. I was looking to pick up a cutting bit at homedepot but It looks like I have to order it off summit. Did you send the heads out first or after the porting ?Thanks again !
I had the local head shop do the vj and deck them .005" after the porting to be sure I didnt hit the seats after the vj was done. I had the cutting bit but dont remember where I got it from. It was about 3/8" in diameter with a round nose. It really made quick work of the sand casting and boss material and the sandpaper rolls smoothed out the cutting marks pretty good.
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
I had the local head shop do the vj and deck them .005" after the porting to be sure I didnt hit the seats after the vj was done. I had the cutting bit but dont remember where I got it from. It was about 3/8" in diameter with a round nose. It really made quick work of the sand casting and boss material and the sandpaper rolls smoothed out the cutting marks pretty good.
I did a very mild port job on a set of 243's a few months back but left the stock valve job alone. I didn't do a before and after but I got one cylinder flowed when they were milled and the port job picked up 12 to 15 cfm at .550 lift. Not bad for a couple of hours work.
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 74
Likes: 0
From: Plantation Florida
I have been trying to locate a cheap set of 243s and LS6 intake, but its getting hard to come by down here in Florida. I have a bet going with some friends, that I can make close to if not the same numbers across the board, with just GM heads and intake. The only aftermarket part is my cam. I'm hoping to break the 400 mark with ported and polished 241s and ported LS6,also I want to port matching everything. I really want to show some of my buddies here that you don't have to buy the most expensive aftermarket parts to make good numbers off the stock LS1 block. I know it can be reached with good work.. For now I'll have to use the 241s, but once I have 243s i'll sell the ported 241s.