When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
That's some great stuff right there , ........but on the valve itself the 1.89 when you redress to the steeper angle you will lose margin , correct ? So are you turning down the valve a bit to maintain a reasonable margin , don't want it knife edged .
You want to fix that **** turn in red.
that is a box stock 706
obviously it flows way less in reverse from gm. But less foward forward flow =less reverse flow. A 50 seat can make that turn correct when you seat % is big.
Yes your going to have to thin the margins up to get a 50 on the 1.89 valve. So pay attention to the width of the 50 on the valve and the seat. And try to imagine your driving a car at 250mph around that turn. Best example i can give on a keyboard. Little more to it than that. But that's a good example
You want to fix that **** turn in red.
that is a box stock 706
obviously it flows way less in reverse from gm. But less foward forward flow =less reverse flow. A 50 seat can make that turn correct when you seat % is big.
Yes your going to have to thin the margins up to get a 50 on the 1.89 valve. So pay attention to the width of the 50 on the valve and the seat. And try to imagine your driving a car at 250mph around that turn. Best example i can give on a keyboard. Little more to it than that. But that's a good example
I have some 1.92 rebuilder valves I may play around with , see if they are better .
I would stay 45 on exhaust side.
and probably keep seat % small. 86 or so%
There Is a reason i say that. Maybe widen the sides more than 86. Probably should concentrate on the short turn of exhaust as well
I would stay 45 on exhaust side.
and probably keep seat % small. 86 or so%
There Is a reason i say that. Maybe widen the sides more than 86. Probably should concentrate on the short turn of exhaust as well
What percentage are you using on the intake throat cut , and do you use a different % on the 50* than when you would do a 45 seat ?
[QUOTE=omc8;20278728]What percentage are you using on the intake throat cut , and do you use a different % on the 50* than when you would do a 45 seat ?[/QUOTE
Probably was 92-94% . Was a quickie test. honestly don't remember. What ever stock is , is what i used i think. You gotta have so much seat material to put ur angles in. Maybe don't worry about 1% and get the turn right.
What percentage are you using on the intake throat cut , and do you use a different % on the 50* than when you would do a 45 seat ?[/QUOTE
Probably was 92-94% . Was a quickie test. honestly don't remember. What ever stock is , is what i used i think. You gotta have so much seat material to put ur angles in. Maybe don't worry about 1% and get the turn right.
Gotcha will do ............ This is for guys that want to check the throat cut , it's a clip of 862 head with a 2" valve the guy was shooting for 1.78 throat but his homemade template will not pass .
I measured a oem 862 today. Memory came back to me.
1.740 seat/bowl. That sounds about right.
92% thats 2.3 throat area after u minus the stem. And if u measure pinch by rocker bolt what does that give you for area?
that and 50 seat ,turn fixed flowed very well.
Here. 2.0 valve. 50 seat.
i started on this other day, just playing
No other changes. Still gotta blend top cut into chamber. And maybe touch up vj in few spots. This is just for test for bench
want to see if i can get more flow than last time (never really tried last time)
,with the stock small seat %
why would i want to do that?
I measured a oem 862 today. Memory came back to me.
1.740 seat/bowl. That sounds about right.
92% thats 2.3 throat area after u minus the stem. And if u measure pinch by rocker bolt what does that give you for area?
that and 50 seat ,turn fixed flowed very well.
But they flow like **** in stock form. What you gain in compression will be lost in flow. That's why I say use the ls1 heads you already have, that flow decent, already have the big intake valve you want and just have them milled to Your desired compression ratio.
This is ignorant... The 706 heads flow great and stock form better than 243 head from an LS1 it's been proven on a flow bench. This isn't the thought or opinion it's a fact and you need to correct yourself.
This is ignorant... The 706 heads flow great and stock form better than 243 head from an LS1 it's been proven on a flow bench. This isn't the thought or opinion it's a fact and you need to correct yourself.
Not true. The smaller valves on the 706 keep it from flowing as much as the 243.
Plus the 243 has better port shape. A healthy LS6 will LOSE power if saddled with 706 heads in lieu of the 243 heads.
Dyno proven by Richard Holdener. Get a better flow bench.
Not true. The smaller valves on the 706 keep it from flowing as much as the 243.
Plus the 243 has better port shape. A healthy LS6 will LOSE power if saddled with 706 heads in lieu of the 243 heads.
Dyno proven by Richard Holdener. Get a better flow bench.
Agreed. 243's are LS6/C5 Z06 heads. A good porting company, like LPE, TEA, etc., ALL say that their ported LS6 heads flow numbers are higher than their ported LS1 heads. LS1 heads can't be ported to flow as much, and definitely more than, a ported LS6, 243 head. 243 casting has superior port locations to begin with....
08-08-2020, 12:38 PM
