Need some advice PLEASE!!!
Need some advice PLEASE!!! Ok heres the problem i have 00 ls1 with full bolt on's, asp u/d pulley, ls6 intake, stock unported tb, a 228/232 .600/.609 on 109 lsa cam. My issue is would i be better off getting prc ls6 heads next or a fast 90/90 combo what will benefit my more as far as bang for the buck and time involved in replacement, i know intake is a quick replacement and heads are more time consuming. What would yield more more power with my set up for the time and money involved. Please post opinions, estimated hp numbers and reason for choice....oh i forgot the car made 400 hp with cam only through a m6 and untouch tb
heads yield more power, do the heads and FAST at the same time if at all possible.
FAST 90/90 - $1150, probably ~10-15Hp over the LS6/stock TB
LS6 heads from TSP will probably give around 40HP i would think.
FAST 90/90 - $1150, probably ~10-15Hp over the LS6/stock TB
LS6 heads from TSP will probably give around 40HP i would think.
But couldnt i pick up 7-10 hp out of getting my tb ported and polished cause if that is the case i dont understand why i should spend 1100 for a fast 90/90 for a extra 5 hp
Heads would be the better bang for the buck. Personally, I won't be going the 90/90 route until I build a new engine. Either a 347cid or larger with stage 2 heads. From the gains I've seen from the 90/90 setup more often than not it seems to be much more beneficial on bigger cube motors, FI, or big flowing heads and big cams. If money was no object and you want every last ounce of horse/torque I'd do both, but between the two I'd pick heads. Buy the heads and port your own TB for about $15 bucks in materials. 
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Originally Posted by 2000 M6 PEWTER SS
But couldnt i pick up 7-10 hp out of getting my tb ported and polished cause if that is the case i dont understand why i should spend 1100 for a fast 90/90 for a extra 5 hp
A FAST 90/90, properly tuned, especially if you had heads as well is going to be more than "5 hp".
The further you get into the mods the more money you pay per horsie. There is no good reason, IMO, not to work the throttle body over a little if you are going to keep the stock unit in there.
Heads > 90/90. Of course doing both at the same time would be ideal, but you gotta have the $$$. I'd go with the heads and a ported TB....unless you still have a 10 bolt rear end...
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Check my sig, were running close to the same cam, I would do heads first, you should be around the same rwhp as me, depending on what heads you go with you should see at least a 40rwhp gain. I'm getting ready to install a fast 90 combo w/ptm tb next week, I'll post up my gains from it after the dyno.
Heads are by far the better bang for the buck here, the 90/90 is the icing on the cake.
Hardest part of the head swap is clean up. Don't be lazy and settle for 8-15hp.
The 90/90 without the ported heads isn't worth as much as with ported heads either I would think. If you dont need more air then giving it moe air isnt going to help it much I wouldnt think. But maybe I'm wrong.
Its the whole combo thats makes the power but the cam can only do so much with stock heads. So if your only moving so much air then making the orafice bigger isnt doing a lot.
The orafice at this point isnt the restriction to airflow the heads are.
Or I could be wrong.
Thats just my half baked quick though before I listen to money to burn (tok) and then go mow the lawn
Hardest part of the head swap is clean up. Don't be lazy and settle for 8-15hp.
The 90/90 without the ported heads isn't worth as much as with ported heads either I would think. If you dont need more air then giving it moe air isnt going to help it much I wouldnt think. But maybe I'm wrong.
Its the whole combo thats makes the power but the cam can only do so much with stock heads. So if your only moving so much air then making the orafice bigger isnt doing a lot.
The orafice at this point isnt the restriction to airflow the heads are.
Or I could be wrong.
Thats just my half baked quick though before I listen to money to burn (tok) and then go mow the lawn
The 90/90 is just the icing on the cake to run with a set of heads. I did everything at the same time but if I was to buy everything seperate i would buy heads first and then the FAST90/90 later. A FAST is a great piece to have on a head/cam setup. A well setup combo will put out great numbers.