Just ordered my 408 and cam from TSP
02-08-2017, 02:10 PM
#12
i have a very similar build. TSP 408, LS3 heads, Blower, 1 7/8 exhaust... I wouldn't put a Y pipe on that motor. I was trying to fit 2" primary 3.5" collector on my car. couldn't find a header that size that fit so I was forced to step down to a 1 7/8....dual 3" at minimum IMO. hell, I run dual 3" on N/A motors that are 5.7+cubes. dyno proven power. even more power to be gained with a 408 + blower.
as for the cam, I agree with pat on the exhaust bias. my cam was speced from Geoff at EPS and it's a 226/246 .629/.629 118+4. I never would have considered that exhaust duration in the past (this is my first set of square heads)
how much boost do you think the blower will make on the 408?
as for the cam, I agree with pat on the exhaust bias. my cam was speced from Geoff at EPS and it's a 226/246 .629/.629 118+4. I never would have considered that exhaust duration in the past (this is my first set of square heads)
how much boost do you think the blower will make on the 408?
I think I found a calculator that said I would make about 7lbs on the 408.
02-08-2017, 03:04 PM
#13
I would have to dig deeper and run some numbers. But off the top of my head something like a 222/238 116+3
You don't need to go wild with a Tahoe if your only at 7-9psi and a 1800 stall speed
That would fall at -2 overlap @ .050 and in a 408 idle very well and should barely be noticeable.
You don't need to go wild with a Tahoe if your only at 7-9psi and a 1800 stall speed
That would fall at -2 overlap @ .050 and in a 408 idle very well and should barely be noticeable.
Last edited by 03sierraslt; 02-08-2017 at 03:10 PM.
02-08-2017, 03:19 PM
#15
True.
Thanks for looking into it! I received an email confirmation that they have shipped my stuff. So its too late to change the cam, but I did some digging and this cam is an off the shelf variant, might be easy to sell if I decide (or see on the dyno) that the short exhaust duration is hindering me.
Truck is not a drag truck. Limiter will stay on at 100mph, this truck pulls my crawler (~8klbs truck& trailer) and gets used on dirt roads. I spend more time in traffic with it than anything, sadly. So idle quality and low stall are the most important to me. And keeping it together. We intend to shift at 6200rpm as well.
I guess I will have to put it together and get it strapped in to see what she can make!
Thanks for looking into it! I received an email confirmation that they have shipped my stuff. So its too late to change the cam, but I did some digging and this cam is an off the shelf variant, might be easy to sell if I decide (or see on the dyno) that the short exhaust duration is hindering me.
Truck is not a drag truck. Limiter will stay on at 100mph, this truck pulls my crawler (~8klbs truck& trailer) and gets used on dirt roads. I spend more time in traffic with it than anything, sadly. So idle quality and low stall are the most important to me. And keeping it together. We intend to shift at 6200rpm as well.
I guess I will have to put it together and get it strapped in to see what she can make!
05-04-2019, 02:48 PM
#16
How did the build go?
I just got a ly6 and am planning a similar build
3.90 stroke rods pistons
And
My LSA supercharger.
Did you have Piston rock ?
I just got a ly6 and am planning a similar build
3.90 stroke rods pistons
And
My LSA supercharger.
Did you have Piston rock ?
True.
Thanks for looking into it! I received an email confirmation that they have shipped my stuff. So its too late to change the cam, but I did some digging and this cam is an off the shelf variant, might be easy to sell if I decide (or see on the dyno) that the short exhaust duration is hindering me.
Truck is not a drag truck. Limiter will stay on at 100mph, this truck pulls my crawler (~8klbs truck& trailer) and gets used on dirt roads. I spend more time in traffic with it than anything, sadly. So idle quality and low stall are the most important to me. And keeping it together. We intend to shift at 6200rpm as well.
I guess I will have to put it together and get it strapped in to see what she can make!
Thanks for looking into it! I received an email confirmation that they have shipped my stuff. So its too late to change the cam, but I did some digging and this cam is an off the shelf variant, might be easy to sell if I decide (or see on the dyno) that the short exhaust duration is hindering me.
Truck is not a drag truck. Limiter will stay on at 100mph, this truck pulls my crawler (~8klbs truck& trailer) and gets used on dirt roads. I spend more time in traffic with it than anything, sadly. So idle quality and low stall are the most important to me. And keeping it together. We intend to shift at 6200rpm as well.
I guess I will have to put it together and get it strapped in to see what she can make!
05-06-2019, 08:28 AM
#17
The short block has been built I think for ~2yrs, but its been sitting on the engine stand. The 5.3 hasnt died yet and I bought a Ford, then a C5; so I am bouncing around between projects
The LSA is sold, so if the 408 doesnt suffer the same fate, it will get my D1
I am sure the pistons will rock, I have a 4.0" stroke. I am expecting 40-50k out of the motor, and to use ~1qt between changes. Just the name of the game with LS strokers
The LSA is sold, so if the 408 doesnt suffer the same fate, it will get my D1
I am sure the pistons will rock, I have a 4.0" stroke. I am expecting 40-50k out of the motor, and to use ~1qt between changes. Just the name of the game with LS strokers
05-06-2019, 12:46 PM
#18
I could come pick your 408 and drop it in my truck and break it in for you.
I am going to use a 3.90 stroke crank JR asymmetrical pistons and total seal gapless rings.
I still am looking for a good machine shop for the block and heads
I am going to use a 3.90 stroke crank JR asymmetrical pistons and total seal gapless rings.
I still am looking for a good machine shop for the block and heads
05-06-2019, 01:21 PM
#20
The short block has been built I think for ~2yrs, but its been sitting on the engine stand. The 5.3 hasnt died yet and I bought a Ford, then a C5; so I am bouncing around between projects
The LSA is sold, so if the 408 doesnt suffer the same fate, it will get my D1
I am sure the pistons will rock, I have a 4.0" stroke. I am expecting 40-50k out of the motor, and to use ~1qt between changes. Just the name of the game with LS strokers
The LSA is sold, so if the 408 doesnt suffer the same fate, it will get my D1
I am sure the pistons will rock, I have a 4.0" stroke. I am expecting 40-50k out of the motor, and to use ~1qt between changes. Just the name of the game with LS strokers
