need to start looking for some good quality head for the stroker and was hoping some of you may have had some experience in using either one of these heads, or now of someone using them.
Cant find much info on the yella terra ones except that it got 490hp out of the box. Ive read a bit on the COME 2004 which sound impressive, 580hp unported out of the box using 2.02 valves.
Would like to know hp/torque performance differences.
Yella terra Bennett hi-port or COME 2004 heads
Started by
_355lxss_
, Dec 02 2005 01:12 PM
18 replies to this topic
#2
_HatchmanSS76_
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Posted 02 December 2005 - 04:19 PM
You could give Craig Bennett (yes Craig not Dave) from Torque-Power Mainifolds a call. I think he was close to having some new heads availible soon. If the heads are anything like thier manifolds than I think you will be happy. Found him to be a great guy to speak to as well, very informative.
#3
Struggler
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Posted 03 December 2005 - 08:32 AM
Realistically what are your performance goals ?
Cast iron VN heads will get your LX well into the tens over the quarter. This is fast enough for you to require a roll cage, tech inspection, UDL etc (read more $$$).
Both the alloy options are expensive and (YT at least) require special rockers.
Don't spend money unneccesarily just so you can say "I've got alloys !!"
Cast iron VN heads will get your LX well into the tens over the quarter. This is fast enough for you to require a roll cage, tech inspection, UDL etc (read more $$$).
Both the alloy options are expensive and (YT at least) require special rockers.
Don't spend money unneccesarily just so you can say "I've got alloys !!"
#4
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Posted 03 December 2005 - 03:56 PM
Easy said as i posted a few times before to make 500hp+ from a 308/355 storker .. start looking at $20k for a reliable everyday motor that wont blow up first big revs. but then you got to throw in transmission/diff/suspension /fuel system and something that most people dont think about is cooling system...
Now this package in a LX will run high 10's on the strip all day long once it hooks up.
To have this sort of motor on the road you will literally blow most things away on the road including big bikes .. unless of course they know how to ride.
But at the same time it will be heavy on the Fuel.. but hey ...... but you still looking at $30K to build a tough reliable car these days.. and that hasnt touched the paint,interior ,etc.
Denis
Now this package in a LX will run high 10's on the strip all day long once it hooks up.
To have this sort of motor on the road you will literally blow most things away on the road including big bikes .. unless of course they know how to ride.
But at the same time it will be heavy on the Fuel.. but hey ...... but you still looking at $30K to build a tough reliable car these days.. and that hasnt touched the paint,interior ,etc.
Denis
#5
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Posted 03 December 2005 - 05:58 PM
I agree, VN heads will do all you need for a very quick street car, if you are talking about a big end strip car then maybe, but why spend money when there is no need. VN heads with 2.02/1.6 valves, duel valve springs, cromoly retainers, screw in studs etc. and a bit of a tickle will get you 530+HP. I was speaking to Eugene from Flowcraft and a VH they had supplied these heads for on a 355 12.5:1 comp was running 10.3's at 129mph. You'd delete almost anything on the street with that sort of power, if you could hook it up.
Peace.
Peace.
#6
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Posted 03 December 2005 - 07:55 PM
And it costs $35K for a stock Commodore, so it's not that bad when you look at it that way.But at the same time it will be heavy on the Fuel.. but hey ...... but you still looking at $30K to build a tough reliable car these days.. and that hasnt touched the paint,interior ,etc.
#7
_355lxss_
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Posted 05 December 2005 - 03:01 PM
My goal is for a low 10sec pass. Reason for asking the question is because the cast vn heads i have will set me back a good part of 4k to get them flowing around 580hp this includes machining and fully assembled.
For a little more cash i thought the alloys would be the way to go due to the fact that i can save some weight in the front end of the car, and being alloy i would of thought that it would disperse the heat better and cool down quicker?
The aim is to make 500-550hp at the flywheel.
What do the cast vn heads flow as std from factory?
For a little more cash i thought the alloys would be the way to go due to the fact that i can save some weight in the front end of the car, and being alloy i would of thought that it would disperse the heat better and cool down quicker?
The aim is to make 500-550hp at the flywheel.
What do the cast vn heads flow as std from factory?
#8
Struggler
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Posted 05 December 2005 - 04:19 PM
Here is a real world example of VN heads.....
$900 of port work got standard valved heads to flow 249cfm @ 25" or 541HP.
These heads on a 355 stroker I assembled with 9.8:1 and a 255 @ 050 solid made 475HP on Sams Performance engine dyno (Sydney).
A month later in a VK Calais it ran 11.4 at only 114mph running out of fuel on its first pass.
This combo would run a mid to high 10 in a well set up LX easily. Want to go faster??? More comp, cam and converter will do it but at a price.
Standard VN heads flow about 440 HP
Hope this helps.
$900 of port work got standard valved heads to flow 249cfm @ 25" or 541HP.
These heads on a 355 stroker I assembled with 9.8:1 and a 255 @ 050 solid made 475HP on Sams Performance engine dyno (Sydney).
A month later in a VK Calais it ran 11.4 at only 114mph running out of fuel on its first pass.
This combo would run a mid to high 10 in a well set up LX easily. Want to go faster??? More comp, cam and converter will do it but at a price.
Standard VN heads flow about 440 HP
Hope this helps.
#9
_355lxss_
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Posted 06 December 2005 - 12:10 PM
gee thats a good price on head porting! my cousin had his dart sportsman heads tickled to flow just under 550hp which set him back around 2k for maching and assemble.
Thanks for that struggler what was the sort of example i was after. Going by those figures the engine will still need to make a good 500hp to crack a low 10 in a torrie. Dont think a torrie hatch is that much lighter than a vk, 20kg difference?
Thanks for that struggler what was the sort of example i was after. Going by those figures the engine will still need to make a good 500hp to crack a low 10 in a torrie. Dont think a torrie hatch is that much lighter than a vk, 20kg difference?
#10
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Posted 06 December 2005 - 05:28 PM
Good example struggler, shows the potential of the vn head. Don't know if you're in Melbourne or not 355lxss but give Flowcraft a ring (03) 9361 2345 and talk to Eugene about what your're after, the heads I mentioned above were fully reconditioned (bead blasted, crack test etc.) and assembled and the price was around $2300.
Cheers,
Cheers,
#11
_1QUICK LJ_
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Posted 18 April 2009 - 04:55 PM
355lx what heads did you end up with?
#12
_355lxss_
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Posted 04 August 2009 - 02:52 PM
ended up going vn heads, ported, larger s/s valves etc. they flowed 550hp
#13
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Posted 05 August 2009 - 11:44 PM
have you run it yet???? i was just reading this thread didnt realize it was so old but vn heads will do the trick but heads that flow 500-550 hp wont run 10 flats in a lx hatch streetcar! on petrol. I have a well set up car that weighs 3000pound and has a SAMS performance 355 that makes 586hp on there dyno and runs 10.01 @134mph .I would have sold u the whole motor for $11,000 this motor cost $25,000 to build has 12.5 to 1 comp and has a set of iron vn heads that are a work of art .I also have 2 355 holdens one with the dash 3 hi ports and the other with the dash 5 hi ports both are 12 to 1 comp big cams one has injection and the other has strip master manifold and 750 hp holley these engines in another lx have run 10.4 &10.68 respectivly and id say have around 530-540 hp max on methanol now i know i could run the mid tens with a good ported set of vn heads with 2.02 valves and a crane cc300 or bigger cam and harrop manifold with 11 to 1 comp on bp ultimate with octane booster but u will need a 4000 + stall 26 inch tall tyres and 4.11 gears .And i have lots of performance 308-336-355 engines and parts i,m about to unload .but i flowed a set of pro comp heads alloys vn style they flowed 440hp @600 lift no point going anymore as thats about as much lift as your going to use ! stock vn heads 440 @600 lift , and i have a set of come heads that are dead stock i have sitting on the bench and they flowed 584hp @600 lift i reckon with not that much work they would flow 620hp @600 more if u used a 2.05 valve but where does it end and what is your goal? BEST BANG FOR BUCK IS THE FACTORY VN HEAD PROB OWE U $2000 by the time u bought a pair $400 then portwork and good springs and retainers and so forth another $1600.
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#14
_355lxss_
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Posted 06 August 2009 - 09:25 AM
Unfortunalty we don't have a track in Adelaide to race, the SA government thinks we don't need one!!!! Yes the engine combo changed in the end. ended up building more of a streeter than a race engine. Ended up with a 355, tp high-rise duel, crane f280 solid 10.8 to comp. engine still made decent hp and tq, 470hp @6900 and 420ftq @4100. should be good for a low 11 pass, thats if we ever get a track happening here in Adelaide?
What sort of torque did your SAMS performance 355 make?
What sort of torque did your SAMS performance 355 make?
#15
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Posted 06 August 2009 - 02:33 PM
Unfortunalty we don't have a track in Adelaide to race, the SA government thinks we don't need one!!!! Yes the engine combo changed in the end. ended up building more of a streeter than a race engine. Ended up with a 355, tp high-rise duel, crane f280 solid 10.8 to comp. engine still made decent hp and tq, 470hp @6900 and 420ftq @4100. should be good for a low 11 pass, thats if we ever get a track happening here in Adelaide?
What sort of torque did your SAMS performance 355 make?
dont quote me but from memory i think it was about 500
#16
_355lxss_
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Posted 08 August 2009 - 01:48 AM
my initial plans were using the harrop single plane manifold, bigger cam f288/f300 and more comp. Also was going to use a 2 speed glide behind it, big convertor and diff gears. Now im running turbo 350, 3500 stall and 3.5 diff gears, so its a little more streetable.
#17
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Posted 12 August 2009 - 07:52 PM
id go alloy. probly the yella terras also. alloy out the box flows as much as a ported cast iron head would. at about the same price
#18
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Posted 01 December 2009 - 03:58 PM
id go alloy. probly the yella terras also. alloy out the box flows as much as a ported cast iron head would. at about the same price
Hi ILH 355 can you gives us a run down of the 355 built by sam
#19
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Posted 02 December 2009 - 11:51 AM
Perhaps slightly off topic...Why the desire to build 355 holdens when a 383 is only a little extra?
Having had both I know which I would do again!
On the heads topic - the unported 2007 COME alloys were added to the 383 replacing well ported VN iron heads. Allowed comp increase from 10.7 to 11.3. Made lots of extra torque, especially mid range torque and were well worth the money in my opinion.
Having had both I know which I would do again!
On the heads topic - the unported 2007 COME alloys were added to the 383 replacing well ported VN iron heads. Allowed comp increase from 10.7 to 11.3. Made lots of extra torque, especially mid range torque and were well worth the money in my opinion.
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