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  1. #1
    Do you ever leave? HPE PETE's Avatar
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    Default PM,s 308 project

    1st of all i will say this will not be an exciting thread, no flashy looking exotic engine components will be used and everything will be built to an absolute bare minimum budget using bits and pieces of have lying around, the only thing that will go in my favour is the labor involved will be no holds barred i will do as much as i can without having to spend any great expense, also this will prob go down as the longest engine build in AV8 history ( if it ever gets finished ) as i can only afford to spend a couple of hrs a week on it so dont hold your breath looking for daily updates

    i have decided that instead of watching everybody elses engine projects come to fruition whilst i plan and collect parts for my own engine i may as well put "something" together in the meantime.

    the idea of this is to build something for minimal cost, put it in a car, race it a couple of times and then sell the complete engine or just the top end to help put funds towards a "good" engine, i do have a 355 rotator but i just dont have the funds to complete the project the way i want to, if i did build it on the cheap without doing a 4 bolt main conversion, better rods etc i can see it would surpass the HP levels of what the components i have available now and if i aim at only building the VN headed good engine only it will never happen so i gota start somewhere.

    there is also the possibility of making this budget engine a 355 which i may still do but i wont be doing a VN headed deal as once again it will end up surpassing the HP level of a budget bottom so this one is going to be early headed and most likely STD stroke.

    if i do the std stroke engine i will be using bits i already have because if i have to start spending money i may as well do the 355 so as far as rods for a std stroke engine go i only have a choice of some VN rods which will keep RPM limited but so will the cast pistons, or i have a set of GRP aluminium SBC conecting rods lying around which i can machine to suit the holden crank for free.......but then there would be no point using a good rod with a hypertech piston either so this is where im am stuck on the decision.....or do i save up and buy good pistons and use the ally rods and turn the f*cker.

    one thing is for sure if i was to use a roller cam i would want something that requires very expensive valve spring package and lifters so the roller cam option is out of the question for this enigne, will be using a custom grind solid flat tappet nitrided camshaft.

    i allocated 2.5 hrs on saturday to start on my project ( selfish i know ) i sorted through the massive collection of early heads to see what i have here and select a set of castings......because i am lazy i was hoping to find some "black" heads as they are large valve from factory which requires less machining time for machining and porting to suit the 2.02 valves but the downside is that they have a large chamber which makes target comp ratio harder to achieve and the chamber shape is not as compact as a red/blue heads

    i found a couple of sets of "B" castings but i am saving these for people who want these heads but found no black heads, i ended up picking out a set of HQ castings that were pretty clean in the water jacket but they were still std valve, we do have other mildly ported large valve early heads here but i am also saving these for jobs as they will require much less time from start to finish for a reasonable set of heads....unfortunately biz has to come 1st

    anyway enough ranting here is the 1st of my weekly 2.5hr contribution, i am doing this in broken stages which is different to how i would normally do a set of heads as i wanted to see some kind of porting straight away for motivation.

    i did the guides on 1 cyl and cut seats

    as you can see this is a big chop out of the bowl going from 1.75 to 2.02, if you were ever going to try and create a situation that would cause chatter in the seat this would be it because the cut is using the whole profile of the cutter from top cut to underside of the cutter blade




    if you are careful and take your time you can get a nice chatter free seat, once the porting is done we will final cut the seats again to get ll the heights within 1 or 2 thou when measured of the deck, you can not rely of spring pockets for valve depth and the spring pockets are never the same height in relation to the deck......this way you get much more even chamber vol as well






    the other reason i am not doing all of the machining 1st like screw in studs etc is so if i break through a port i havent wasted even more valuable time...........aiming for around a lazy 250-255cfm with these heads, there is more to be had but at this stage i am not setting the goal too high

    ruffing out intake port





    so after 2.5 hrs i fit and honed 2 guides, cut 2 seats and the port is only 1/2 roughed out, none of the critical areas are sized...so this is going to take some time

    Last edited by HPE PETE; 17-11-2013 at 07:17 PM.

  2. #2
    Do you ever leave? immortality's Avatar
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    Subscribed.

    I think this is how a lot of home projects come together, little bits at a time

  3. #3
    casual poster vr304's Avatar
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    What sorta car you gonna put it in?

  4. #4
    Do you ever leave? EH179's Avatar
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    Good stuff mate, about time you did a project for yourself.

    If you get stuck and need advice, just ring me

  5. #5
    Do you ever leave? HPE PETE's Avatar
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    Quote Originally Posted by vr304 View Post
    What sorta car you gonna put it in?
    my mate that just built the 550hp 360ci early headed engine said i could put it in his VB commodore and race it a few times, part of the reason for the early heads was i dont have to buy pipes as he has custom 1 5/8 4 into 1's, he also has a turbo 350 which has been modified to suit a trimatic pattern block with a 5200 converter, idealy i would want to use a bigger converter but beggers cant be choosers

    the thing is the only trimatic patern block i have is .060 over in good condition which doesnt overly concern me as i wouldnt spend a whole lot on the block anyway, i will do a 1/2 grout fill on it .....to save piston costs i was looking to see if i could use a LS3 piston which is 4.065 but the pin diameter is .945 and they wouldnt cost a lot either off the shelf then i would need rods etc etc......im tossing between a hypertech piston with the VN rods or doing a custom piston and using the ally rods

    but the cost of a custom piston is not in the budget and i wouldnt want to spend up big on a .065 piston either, im sorta stuck with these decisions ATM so in the meantime i will get the heads done

    if i had another tri block smaller bore, even .040 i would consider selling the 355 rotator to buy a custom piston then if it needs a re bore down the track you could just order a set of .045 pistons

  6. #6
    Part of the furniture Tim304's Avatar
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    Hey Pete. Feel free to use my ute as a doner car. Id happily pull mine out and throw yours in for a few runs. Then we'd both learn about the setup of a ute for when yours is going....

  7. #7
    Part of the furniture Tim304's Avatar
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    And I know youve started pete but ill donate a set of vn heads if ya want them...

  8. #8
    Senior Member sik66's Avatar
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    This will be a awesome little project!!...... keeping it as std stroke(even though power would be easier to get with stroker)...big comp,nice heads/manifold....biggest roller stick and see how much you can go!.....be even more impressive using a modded std dual plane to get Max. Power.......would surely turn heads at track!........just coz....

  9. #9
    Do you ever leave? HPE PETE's Avatar
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    well this is also a good gesture tim.....can u imagine a HQ headed engine in a VS.

    this thread could end up turning in to a possibility for doing deals......LOL

    one thing is if i sell the complete engine or top end only who ever buys it will inherit some valuable R&D as these heads will have every bit of early holden cylinder head development, R&D and experience i have to date put in to them
    Last edited by HPE PETE; 17-11-2013 at 07:13 PM.

  10. #10
    [PREM72] pont69's Avatar
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    Quote Originally Posted by HPE PETE View Post
    well this is also a good gesture tim.....can u imagine a HQ headed engine in a VS.

    this thread could end up turning in to a possibility for doing deals......LOL

    one thing is if i sell the complete engine or top end only who ever buys it will inherit some valuable R&D as these heads will have every bit of early holden cylinder head development, R&D and experience i have to date
    I'm already interested in the engine

  11. #11
    Do you ever leave? HPE PETE's Avatar
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    Quote Originally Posted by sik66 View Post
    This will be a awesome little project!!...... keeping it as std stroke(even though power would be easier to get with stroker)...big comp,nice heads/manifold....biggest roller stick and see how much you can go!.....be even more impressive using a modded std dual plane to get Max. Power.......would surely turn heads at track!........just coz....
    the one thing i know for sure is there will be no dual plane intake......oh and the roller, unfortunately the roller is just not in the budget, but just cause it wont have a roller doesnt mean it wont be a big stick, going to see what rockers i can fit in there, the bigger the ratio the better LOL

  12. #12
    Part of the furniture ajvx01's Avatar
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    I'll be following this one so are you going to bite the bullet and give us a budget you plan to stick to?

    Sent from my Z10 using Tapatalk 2
    willing to do domestic/commercial electrical work for car parts/panel work.

  13. #13
    Not the Kingswood! hq308's Avatar
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    Budget standard stroke early headed 308 - you've got my attention

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  14. #14
    Do you ever leave? HPE PETE's Avatar
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    the other thing is i will be using valves i already have which are new but unfortunately that means no 7mm, 8mm or 5/16 diameter valve stems either, then again i could prob buy 1 or 2 valves a week.......then i will need expensive guides as well, bloody engines cost a fortune if you want to go fast.....i should know better, we cant stray off the budget theme or it defeats the purpose of building "something" going racing then selling to help to towards the engine i want to build....

    i may end up liking this engine and keeping it or just selling top end then doing a VN top end to go on it.

  15. #15
    Do you ever leave? HPE PETE's Avatar
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    i dont have a budget as such as in a set cost.....but you could say the set cost is absolutely as cheap as possible using as much of the stuff i already have as possible, it may extend to the most expensive part being a set of pistons, i just remembered i think i may have a .030 trimatic block so the custom piston deal may be a possibility, i have a good std bore VN block and a complete STD bore VT roller engine but im saving that for the good engine, the reason to use the tri block was so i could put it in my mates car

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