Yellow Bullet Forums banner

1 - 20 of 342 Posts

·
Registered
Joined
·
444 Posts
Discussion Starter · #1 ·
Built a 6.0 for my 71 Chevelle bracket car. Basically a rebuilt gen 3 lq4 with stock crank, gen 4 rods and Summit forged flattops. Rotating assembly was balanced, block was bored .030 and decked. Factory 862 heads, no porting but gone thru with Trick Flow double springs, Summit 8702 cam, vic jr, AED 750 HP 1-7/8 headers and a msd 6014.

Cam is 236/246 @ .050 612/612 lift.

Rest of car is t 350 with a PTC 9” coverter that stalls at 4200 on motor, 3.90 gears, 28” tall tires

Best time so far is [email protected] on motor. [email protected] on 100 shot ramped in over 1.5 secs.

Something seems off with the combo. Thinking the cam is too big or heads are too small. What would be a good cam to try better suited to the heads? Or better to suit different heads to existing cam. Best et is shifting at 6500.
Thinking of trying the cammotion Junkyard Dog nitrous v1 cam. Maybe too big? Thanks for any help!
 

·
Registered
Joined
·
1,258 Posts
You got the timing set right? That thing should be significantly faster. Should easily be in the 11s I would think.
 

·
Registered
Joined
·
1,258 Posts
Also looks like those heads might flow a little less than the stock 317s but they will bump the compression a good amount. Might be close to a point, they are 10cc smaller. Also the intake valve is 1.89” on the intake which the 317s are 2.00”. Might be worth throwing the 317 head on it especially if you port them a little.
 

·
Registered
Joined
·
444 Posts
Discussion Starter · #7 ·
You got the timing set right? That thing should be significantly faster. Should easily be in the 11s I would think.
I ran it up as high as 34*...highest mph is at 28*. I thought it would be in the 11’s as well. So far the LS has been disappointing for sure.
 

·
Banksters Paradise
Joined
·
8,980 Posts
09-23-2013, 10:05 PM
#60
[email protected]
FormerVendor
iTrader: (3)

Posted by Martin @ TickPerformance

"Trust me when I say, do not buy a Victor Junior. Buy a Super Victor like the OP did, it's worth a lot of power over the Victr Junior.

I don't think the results of the under the curve torque would of been near what they would have been had the OP used a Victor Junior."

Sales@Tick is offline

Reply Like



Old
09-24-2013, 09:56 AM
#61
SILVERBIRD97
10 Second Club
Thread Starter
iTrader: (33)

SILVERBIRD97's Avatar


"Yeah, like Martin said there were too many results out there comparing the 2 intakes and the Super Vic always made more power in every application. Anytime you can add plenum volume the power will come up across the rpm range.

I finally got a chance to drive around this weekend tuned. Man its just so responsive, and 7200 shes still pullin HARD. I can't wait til I can go to the track"



FROM HERE:
 

·
Registered
Joined
·
444 Posts
Discussion Starter · #12 ·
Also looks like those heads might flow a little less than the stock 317s but they will bump the compression a good amount. Might be close to a point, they are 10cc smaller. Also the intake valve is 1.89” on the intake which the 317s are 2.00”. Might be worth throwing the 317 head on it especially if you port them a little.
The 317’s that came with my motor were cracked and a friend gave me these 862’s. Had my block decked, heads have a slight mill to clean them up, pistons are flattop .008 out of deck. We figured 11.5:1 compression.
I still have the 2.00” intake valves, thought about throwing those in these 862’s and a bit of home porting. Been looking at other heads, probably what it needs.
 

·
Banksters Paradise
Joined
·
8,980 Posts
Your camshaft is too big, especially for that intake. A stock LS6 intake will et better than a victor jr.

And heads are too small.

Last time one of my cars went down the drag strip was back in 2005 and it ran mid 11's @ 120mph n/a with a sbe 346ci ls1 in a 3700lb sedan with stock plastic ls6 intake and a little 230/230 591/591 112 lsa camshaft. Ported 5.3 heads.
 

·
Registered
Joined
·
444 Posts
Discussion Starter · #14 ·
Your camshaft is too big, especially for that intake. A stock LS6 intake will et better than a victor jr.

And heads are too small.

Last time one of my cars went down the drag strip was back in 2005 and it ran mid 11's @ 120mph n/a with a sbe 346ci ls1 in a 3700lb sedan with stock plastic ls6 intake and a little 230/230 591/591 112 lsa camshaft. Ported 5.3 heads.
Kinda what I was thinking. Had a 388 gen 1 with a vic jr and 252/258 638 lift solid roller same compression ran 11.80’s. Thought I went with a small cam, these ls engines must be alot different...all new to me....

been looking at some of the PRC heads, may go that route and a different cam.
 

·
Registered
Joined
·
444 Posts
Discussion Starter · #16 ·
Very similar cam....
on a 110 LSA 106 ICL....LY6 clone (LQ4 W/ LS3 heads)
5000 stall TH350 4.10's and 28" tires
3420# @ 2000' DA

All motor [email protected]


....you need some better heads ;)
I figured the heads were small, but seen enough people use them, thought it was worth a try. Something to start with and they were free. Hoped they would at least hit 11’s.
Be nice to hit 10’s on motor, gonna have to spray it to get there Im thinkin.
 

·
Registered
Joined
·
4,248 Posts
862 heads flow about the same as the Gen I SBC 906 or 062 vortec heads. 226 cfm intake, 174 cfm exhaust. They are way too small for that setup.

I have basically the same short block as you but stock 4.00 bore and stock Lq9 pistons with Gen IV rods, ~10.5:1 compression, LS3 heads/intake/injectors, 220/224 .575/.575 112 LSA cam, 1-7/8" long tubes, 3" mandrel bent exhaust.
~3250# w/ 3.54 gear and faceplated TKO 600 5spd
Runs easy 11.80s @ 120-123 w/ terrible 2.0 60ft times.

You definitely need a better set of heads and she will wake up big time.
 

·
Banksters Paradise
Joined
·
8,980 Posts
Agreed he needs better heads. But also the cathedral port version of the victor jr. intake is a poor design. It is too restrictive and nothing like the vic jr for ls3 heads, or even the stock LS3 intake, both of which are good intakes.

If you go for a pair of PRC cnc cathedral port heads, you need to swap over that vic jr with at least a super vic, or fast102
 

·
Registered
Joined
·
444 Posts
Discussion Starter · #19 ·
862 heads flow about the same as the Gen I SBC 906 or 062 vortec heads. 226 cfm intake, 174 cfm exhaust. They are way too small for that setup.

I have basically the same short block as you but stock 4.00 bore and stock Lq9 pistons with Gen IV rods, ~10.5:1 compression, LS3 heads/intake/injectors, 220/224 .575/.575 112 LSA cam, 1-7/8" long tubes, 3" mandrel bent exhaust.
~3250# w/ 3.54 gear and faceplated TKO 600 5spd
Runs easy 11.80s @ 120-123 w/ terrible 2.0 60ft times.

You definitely need a better set of heads and she will wake up big time.
Thats good mph, be nice to see that out of this. Been looking at heads and hadn’t considered the ls3 thinking they would just be way too big. Maybe they aren’t? The ported 243/799 from Texas Speed looked good. Decisions decisions.....
 

·
Registered
Joined
·
444 Posts
Discussion Starter · #20 ·
Agreed he needs better heads. But also the cathedral port version of the victor jr. intake is a poor design. It is too restrictive and nothing like the vic jr for ls3 heads, or even the stock LS3 intake, both of which are good intakes.

If you go for a pair of PRC cnc cathedral port heads, you need to swap over that vic jr with at least a super vic, or fast102
Whichever way it goes, it will be a carb. Carbs work well for me. Looks like the question is Ls2 or 3 style?
 
1 - 20 of 342 Posts
Top