Can a 2.00 intake valve be used on a 5.3 cylinder head?
08-23-2019, 07:20 PM
#81
If you flow all 8 ports your going to have some differences. And just investigate as to why and try some things
All you need is the larger 2.0 valve and the correct valve job and blend the seat. Use a 40 top cut on vj
I know where the next spot is to really wake these up. But I have a 862 head here I am going to try a few more vj on. I have a few ideas I still want to try
Last edited by Lsbmer; 08-23-2019 at 07:29 PM.
08-24-2019, 10:36 AM
#84
Yes that's right 220 to 223 cfm , I have never seen 224.
If you flow all 8 ports your going to have some differences. And just investigate as to why and try some things
All you need is the larger 2.0 valve and the correct valve job and blend the seat. Use a 40 top cut on vj
I know where the next spot is to really wake these up. But I have a 862 head here I am going to try a few more vj on. I have a few ideas I still want to try
If you flow all 8 ports your going to have some differences. And just investigate as to why and try some things
All you need is the larger 2.0 valve and the correct valve job and blend the seat. Use a 40 top cut on vj
I know where the next spot is to really wake these up. But I have a 862 head here I am going to try a few more vj on. I have a few ideas I still want to try
08-24-2019, 05:11 PM
#87
08-24-2019, 07:07 PM
#89
TECH Resident
I have a 0.020" milled hand ported pair of 862s with 2.00" intake valves that were done by Lloyed Elliot on a LQ4. Makes far more power than the 317s ever thought about. They flow similarly to unported, stock rectangle port head but have much higher velocity.
08-24-2019, 07:43 PM
#91
TECH Resident
I know its not bottom dollar but Lloyd took a $50 pair of junkyard 862 heads, cleaned, milled, ported, did the performance valve job, supplied the 2.00" valves, new valve seals and the BTR dual spring/retainer kit all for $830. They came back ready to bolt on to an engine and run.
08-24-2019, 08:18 PM
#93
I just showed the 50 so you can see what it does.i wouldn't call a 15 and 30 angles normal anymore. Its 2019. Not 1990. Peak torque will come when the intake valve is closing at the right time.
Below that there will be reversion
Below that there will be reversion
08-24-2019, 08:22 PM
#94
The guy with the 30/45/60 cutter surely doesn't want to step up his program
08-29-2019, 07:23 PM
#95
I’ll just say this, the stock 5.3 heads that Bo White did for me years ago flowed extremely well. The combo in my signature I drove for 80k miles before selling and the person who bought it told me when he got it tuned it made over 400rwhp. For a cam that small and worked over stock castings they did not disappoint for the money I had invested which was about $600. Never regretted my choice on a stock bottom end LS1. Had I changed short blocks I’d have had reason to invest more.
04-08-2020, 09:11 AM
#96
stock they came with 1.890 and 1.550 intake and exhaust. You have to cut the seat to 2in do a bowl cut and set up venturi blend the vlave job put a short turn in the head and play with the bowl. Then put a nice back cut on your LS2 valves and send her down the road. I personally made a 862 head with a 2in valve flow 308@.600 held around 300 until .750 then started going turbulent.
04-08-2020, 11:37 AM
#97
stock they came with 1.890 and 1.550 intake and exhaust. You have to cut the seat to 2in do a bowl cut and set up venturi blend the vlave job put a short turn in the head and play with the bowl. Then put a nice back cut on your LS2 valves and send her down the road. I personally made a 862 head with a 2in valve flow 308@.600 held around 300 until .750 then started going turbulent.
08-07-2020, 07:58 PM
#99
why in the world would gm want to kill low lift flow. And make the seat % so big stock? (u cant make a decent last part of turn shape at 93% and a 45 angle like oem 706. )To kill off low lift flow or to just use same bowl hog as there other cathedral heads. And cheaper production .idk
But watch Richards videos. The famed 243 hardly has a thing on a 706. Even on a cammed 6.0. Less low lift flow and the way turn is shaped from gm.way less reversion. Way less reverse flow.
You do it right with a 1.89 valve it will outflow a 243 barley and still be around 200cc if that's what u want. Steeper seats flow less at low lift and better pressure recovery at higher lifts.
40/50/62/75 or something like that i used.
u want 4 angles.
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omc8 (08-08-2020)
08-08-2020, 11:42 AM
#100
I used the stock seat width. Or close to it. . Stock seat width is around 92-93ish% of a 1.89 valve . Steeper seats help shape the final part of the turn, especially when over 90% width
why in the world would gm want to kill low lift flow. And make the seat % so big stock? (u cant make a decent last part of turn shape at 93% and a 45 angle like oem 706. )To kill off low lift flow or to just use same bowl hog as there other cathedral heads. And cheaper production .idk
But watch Richards videos. The famed 243 hardly has a thing on a 706. Even on a cammed 6.0. Less low lift flow and the way turn is shaped from gm.way less reversion. Way less reverse flow.
You do it right with a 1.89 valve it will outflow a 243 barley and still be around 200cc if that's what u want. Steeper seats flow less at low lift and better pressure recovery at higher lifts.
40/50/62/75 or something like that i used.
u want 4 angles.
why in the world would gm want to kill low lift flow. And make the seat % so big stock? (u cant make a decent last part of turn shape at 93% and a 45 angle like oem 706. )To kill off low lift flow or to just use same bowl hog as there other cathedral heads. And cheaper production .idk
But watch Richards videos. The famed 243 hardly has a thing on a 706. Even on a cammed 6.0. Less low lift flow and the way turn is shaped from gm.way less reversion. Way less reverse flow.
You do it right with a 1.89 valve it will outflow a 243 barley and still be around 200cc if that's what u want. Steeper seats flow less at low lift and better pressure recovery at higher lifts.
40/50/62/75 or something like that i used.
u want 4 angles.