Edited by gtrboyy, 29 November 2008 - 08:20 PM.
porting pre VN V8 heads
Started by
makka
, Oct 10 2008 07:39 PM
60 replies to this topic
#51
gtrboyy
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Posted 29 November 2008 - 08:15 PM
the redline hiwinder is a nice manifold,basically the only decent single plane to use if you want everything under the bonnet,redline bumped up their prices last year so the cheapest i got a new one for was $620 cash from rares,with some porting by someone who knows what theyre doing they can be made even better(450-500hp)...after that a harrop single plane is the way to go,its a great manifold to use.
#52
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Posted 29 November 2008 - 11:04 PM
Ultimately the heads and manifolds need to suit what you are using the car for. If a VN head produces 400+ HP what RPM is that at and where is the torque curve at, are you going to use 6000 RPM all day everyday just so you can use all the available power?
The reason pre VN heads are good for the street is power and torque are at usable RPMs for cars that go round corners and up and down hills.
Chasing peak horsepower can be waste of money for a street engine the never revs past 5 grand.
The large inlet runners and ports in VN heads are excellent for high revving engines, much like 4V Cleveland heads.
James
The reason pre VN heads are good for the street is power and torque are at usable RPMs for cars that go round corners and up and down hills.
Chasing peak horsepower can be waste of money for a street engine the never revs past 5 grand.
The large inlet runners and ports in VN heads are excellent for high revving engines, much like 4V Cleveland heads.
James
#53
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Posted 07 December 2008 - 07:11 AM
hi all
eugene from flowcraft has built more 308,s and ported more holden heads than most of us here have had hot dinners
he always reccomends red heads on street driven holdens ,the smaller ports when ported make for a faster reving engine and ive been in some of the cars with engines he has done that run 11 sec with red heads (why spend the money on vn heads and all the accesories you need to run them when good ported red heads will run these sorts of times)
some of you guys are stuck on the more flow must be better thing but there is much more to it than outright flow
id stick with the red heads and get flowcraft to port them he will also modify the stock holden manifold and quaddy if you like as a comp-lete package that will blow your mind once you drive it
eugene from flowcraft has built more 308,s and ported more holden heads than most of us here have had hot dinners
he always reccomends red heads on street driven holdens ,the smaller ports when ported make for a faster reving engine and ive been in some of the cars with engines he has done that run 11 sec with red heads (why spend the money on vn heads and all the accesories you need to run them when good ported red heads will run these sorts of times)
some of you guys are stuck on the more flow must be better thing but there is much more to it than outright flow
id stick with the red heads and get flowcraft to port them he will also modify the stock holden manifold and quaddy if you like as a comp-lete package that will blow your mind once you drive it
#54
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Posted 08 December 2008 - 07:05 PM
yeah well, I got VN heads now, just gotta decide on a manifold!
my old 308 had vn heads ported by superflow at cost of $1000 assembled with standard size valves ,the engine had a harrop single plan manifold flat tappet cam which was 272/282 @0.050 figures engine made max power at 7800 and torque at 5500 it made 488hp 390l/b .i ran 11.12@119 ten years ago the only down fall with vn heads is you need 5000+ converter to make them work as for hq heads peter michaels at PM ENGINES in s.a is your man has his own intake stripmaster,he has mad well over 550hp on 308 cubes so the hq heads mustn't be that bad.cheers rick
#55
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Posted 09 December 2008 - 06:23 AM
480ftlb@4800 with vn heads,yeah red heads are better 
red heads are so much better that guys pull off all there injected heads on there vn's and repalce them with red heads to get more torque.
atfer owning 20+ holden v8's in various forms of stock to 500hp,i can honestly say that i've never seen a stock early head out perform a vn one.infact,i'd go as far as saying the stock roller cam motor i have in my vs ute would out torque my old red headed 355.
red heads are so much better that guys pull off all there injected heads on there vn's and repalce them with red heads to get more torque.
atfer owning 20+ holden v8's in various forms of stock to 500hp,i can honestly say that i've never seen a stock early head out perform a vn one.infact,i'd go as far as saying the stock roller cam motor i have in my vs ute would out torque my old red headed 355.
#56
MRLXSS
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Posted 09 December 2008 - 07:19 AM
infact,i'd go as far as saying the stock roller cam motor i have in my vs ute would out torque my old red headed 355.
Oooo! Not knowing your red headed 355, but i reckon thats a pretty big statement! LOL! What are you willing to dare? LOL. Nudey Run? hahaha
#58
makka
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Posted 14 April 2009 - 11:40 AM
VNs win hands down
thats why i sold my early heads to MRLXSS and bought VN's!
#59
MRLXSS
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Posted 14 April 2009 - 11:54 AM
thats why i sold my early heads to MRLXSS and bought VN's!
For WILDUC's 308... LOL
#60
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Posted 15 April 2009 - 12:52 AM
Both heads have their place of merit and of course personal prefference. On record I would agree with the consensus Vn are better yes. Cost more yes accessories cost more to convert yes but at the end of the day wont be as prone to cracking or corrosion as an early head.
As far as flow figures go HQ 2184 head with 1.94 valves go 480-497 flow potential. 2.02 valves go 490-515 flow potential.
Vn pocket ported with 1.94 stock valves will go 500-515 , Stainless valves will go 520-530. 2.02 pocket ported go 560 no drama
2.02 full port job go 610-630. 2.05 go 620-640. 2.08 go 640-660 flow potential.
Manifolds I prefer the Harrop to anything else in a carb application, unless you want to stay under the bonnet in that case a ported hywinder is a good thing.
As far as flow figures go HQ 2184 head with 1.94 valves go 480-497 flow potential. 2.02 valves go 490-515 flow potential.
Vn pocket ported with 1.94 stock valves will go 500-515 , Stainless valves will go 520-530. 2.02 pocket ported go 560 no drama
2.02 full port job go 610-630. 2.05 go 620-640. 2.08 go 640-660 flow potential.
Manifolds I prefer the Harrop to anything else in a carb application, unless you want to stay under the bonnet in that case a ported hywinder is a good thing.
#61
_Jims engines_
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Posted 08 February 2013 - 09:47 PM
Hi every one I have been building 308 red motors for a while now and the most power I have got out of std valve ( holden valves) is just on 345 hp at the engine and the torque is awsome 3 difs 1 turbo 400 1 trimatic and 1 t5 busted in a hq 1 tonner with slicks best time 13.4 at the drags Also have achieved 420 hp on cutdown vn valves half way between vn and standard can flow up to 450 hp on flowbench I have found the full size vn valve are too big had a torana in the early 90s run 10 89 and 11 02 with these valves lj 4 door give it a go you will de surprised hoe much better they are then l34 best i could get out of l34 was 415 on the flowbench also they are very thin under the seat and can rust through I went to the smaller valve because of this problem and discovered the flow was heaps better so my secret is out now so give it a go it works exelent for street engines good torque let me know what you think I an a new member so be esasy on me lol cheers Jim
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