206 replies to this topic

[Guns n roses]

Thanks Andrew, i actually bought a 750 proform before you replied so hopefully ok! dare say it will need down jetting 

 

Only reason i red the 750 proform is actually a better carb than the 650 proform? (downleg boosters)

[Redslur]

Smart thinking mate....Glad you decided to keep it!

[ozyozyozy]

its been a while since there has been action on this page.

there is a group of us out there that for some reason that we don't probable understand ourselves let alone others seem to stick with the standard stroke 308.

now my engine has been out for a freshen up the past few months but the intention was while its out to park the iron efi heads and fit alloys. im happy coz I have been able to make this happen, main reason approx. 25kgs less weight high up over front wheels,

knock on affect is compression has been pushed to 11 to 1 and these heads from indications should also flow a little more, happy days.

be a month, more than likey till I can get it back on dyno, hoping to crack the 400 rwhp with a standard stroke 308, if not oh well, ill survive

[308mate]

Spacer between the carb and the inlet manifold can serve several purposes. A spacer will effectively increase the volume of the inlet manifold. If your engine has the capacity to consume more air & fuel then this is a simple way of increasing the air (and fuel - provided your carb is big enough for your engine). 

 

Also if you have a dual plane manifold and you put an open spacer then you are allowing both sides of the carb to feed all intake ports. This can have benefits for hp and torque but may shift the peak torque higher up the rev range.

 

A spacer can also help isolate the carb fro the 'hot' inlet manifold, which in-turn heats the air and fuel coming into the engine. Cool air and fuel is denser which means you can fit more in which means more to burn and more power.

 

Generally a spacer will increase power by a percentage of what you are already producing. I thinks its safe to say that on standard-ish motors a spacer and a free flowing air filter could bring 10%. If you are making 200hp then 20 hp - cheapest power gain out there.

 

Hope that helps.

 

Cheers, Scott

[Struggler]

I haven't been on this site for a while but it is good to see there is still some love for the stock stroke 308 !

[Redslur]

Yep agree Struggler.

 

Mods can we make this thread a sticky?  It always seems to pop up time and time again and has good relevant info in it.

[LS1LX]

Sounds like a tough engine there Ryan, 7500rpm is nice. I would swap to a set of worked VN heads on that combo before changing to a 355, you will probably loose close to 1000rpm going to 355

[gtrboyy]

I dunno a high comp baby stroker with early heads is rare thing these days...they rev hard & sound off it's tits lol.

What's rest of driveline? Stally? Trimatic & 4.11 borgwarner?

 

HPE does good work.What are they like at time frames returning work/parts?

 

 

 

To go 355ci & efi heads may as well completely build another engine...

[Redslur]

Glad this thread keeps getting rehashed. Again I ask the MODS to make this a STICKY THREAD as it is great to refer too. As for your engine combo Ryan, good red heads can flow enough to make big power. Out of the box VN heads are a better set up but I have personally had 308 red heads that would be good for 450hp. Be interesting to see if you can get your 500hp out of yours. My current 355 set up with VN heads is well over 500+ HP...Friggin awesome to drive :-) Keep us posted bud!!!

[ozyozyozy]

Forgot, i havent up dated on here after my head change, 415rwhp.
Drivability has changed, gained a little top end made it a little doughie down low.
I have recently gone from 3.7 to 3.89 diff gears and engine is loving it.
A upcoming gearbox change should make a huge change also

[Redslur]

.350 RWHP is my guesstamation. Will be a staunch set up for sure..

Edited by Redslur, 26 June 2016 - 06:27 PM.

[cameron]

Been reading this thread find it great so thought i may join up and say hi
Really good post from few years ago still going, hence no posts past 5 months so i thought i may nudge it along
Iv been building an lx 4 door for 3 years and thought i may share engine components bla bla bla
If anyone has any idea of what rwhp it may produce would be appreciated.
Vn 304 Stroked 355
30 thou over
Crow cam part #883691 grind # f-288-2
Come 600 series heads
Frp pistons
Scat hbeam rods
Harrop high rise manifold
750 holley
Rollermaster timing
Power bond balancer
Comp roller rockers
Trend pushrods
Molly rings
King race bearings
Lunati valve springs and retainers
Msd 6al
Custom castle hill extractors
Mal wood under dash clutch set up
Top loader
9" billit carrier mini spool lsd
Billet axles

To name a few, im not mechanically minded at all so if any one
Could let me know maybe if its any good and maybe approx rwhp.
As not dyno yet prob another year away from on road.
Cheers guys and gals
Awsome sight

 

 

http://www.aussiev8....ppet-355-a.html

 

 

Cameron

[boblhslr]

Hi guys just an update on my combo. Just to update it is a stock stroke bottom end, .060 over, flat top pistons, HQ red heads l34 spec, 5803 solid cam and a 750do holley. One of the changes made was to remove the 2" hvh spacer and fitted a 1" hvh spacer which made a little difference. Since last post have added a cold intake tray, a bonnet scoop and just some tuning.Also had to make some changes to the car, changed rear springs and couple of tweaks to the front end. Have managed to get a new pb of [email protected] at Willowbank.

Edited by boblhslr, 28 June 2016 - 09:56 PM.