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  1. #31
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    Ok, I need to get spacers for the standard 308 rocker covers. As Pete said the rockers are YT platinum. Spacers available are 6mm, 10mm, & 12mm. Has someone been through this & knows which spacer will clear properly?

    While I'm at it choosing the right cam spec & carburetor for this 372 engine build is on my mind. Constructive thoughts/opinions are welcomed.

    cheers Ando

  2. #32
    Do you ever leave? EH179's Avatar
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    I just compared your flow sheet to mine.....almost identical.... Pete's consistent

    With the spacers, the main thing will be clearance for brake booster, which if I remember there is enough room, unlike commodores.
    Since the cam is for circuit racing, I'll leave alone.
    The carb could be 780-800cfm from QF, Pro Systems and others, even a 950HP would probably work well.

  3. #33
    Do you ever leave? HPE PETE's Avatar
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    Im out of the shop today but When i get home i will pull out some of the cam options i think will be suitable for this car/combination, if it was just cuircuit racing the cam choice would be clear cut but john also wants to do a fair amount of street duties and be well behaved whilst doing so as well as being able to drive a couple of hundred kays to car shows and back without being unpleasant to drive

    The hyd rollers i have in mind vary from .620 to .660 lift and although id like to use the .660 lift lobes we have to consider longevity of various valve train components and valve guide life, the smaller options im looking at are in the 236-240 intake and 242-246 @50 range and the larger ones are low 240's int and 248-252 ex on 108-110 lsa + 4

    My only concern with the larger grinds is if john thinks it is unpleasant to drive cruising around but these would make more power and tq but a little higher up in the rev range.....950 style carb something like a custom built zok carb would be a nice carb

  4. #34
    Do you ever leave? EH179's Avatar
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    I think with the cubic inches, camshaft choice becomes less critical, especially in the durations mentioned.
    372 cubes will swallow all of the above and ask for more.
    Has the comp' ratio been decided yet?

    I forgot all about Zok with the carb suggestions, sorry mate.

  5. #35
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    Ha Ha! I think I'm the typical naive customer who wants it all rapt in one motor. lol
    I do need to consider this engine for street cruising & touring the car anywhere in Aus. The circuit days at this point are limited for club/circuit day fun. Spirited circuit driving is what the car will be mainly set up for but an all out track car would just annoy me as I do enjoy touring it around the country. I guess if I was to categorize what I'm trying to achieve with this car; Pro Tourer comes to mind. So a circuit racer...No! A touring car with circuit capabilities..Yes!
    Hope we are all on the same page... Hey Pete, an all day drive down to say Sydney would be the max time in the car, with a couple stops, maybe a few times a year would be the max seat time in the car at any one time. The cam choice for the motor..Well I suppose we need to consider the gearing..The car has the 5 speed TKO 600-(.82 od) & 3.5-trutrac 9" diff. Tyre diameter..say 620mm. It's not a daily driver so we can be a little adventurous with the cam grind..Hope this helps.

    cheers Ando
    Last edited by 76XSS; 21-04-2014 at 09:23 AM.

  6. #36
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    Hey EH179, thanks for the heads up..yes a 12mm spacer will clear so all good about that..Sounds like your happy with your motor..Are you running a carby?

    Quote Originally Posted by EH179 View Post
    I just compared your flow sheet to mine.....almost identical.... Pete's consistent

    With the spacers, the main thing will be clearance for brake booster, which if I remember there is enough room, unlike commodores.
    Since the cam is for circuit racing, I'll leave alone.
    The carb could be 780-800cfm from QF, Pro Systems and others, even a 950HP would probably work well.

  7. #37
    Do you ever leave? EH179's Avatar
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    Yeah mate, very happy with the engine to date... traction is eluding me, lol.
    I run a Pro Systems carb and very happy with that too, as you know when the carb plays up, it ruins the driving experience.

  8. #38
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    I ended up buying a Crane HR-238/365 for mine Ando, 238/242@50 .602"/.614" total lift 110 lsa.

  9. #39
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    FYI with .82 o/d (same box) and 3.5 rear end 16" wheels with 225/50 tyres I was cruising at 2500rpm at 100kph.
    So you need to consider the cam being able to cruise smoothly at 2500. Obviously more revs with smaller tyres and less with bigger diameter.
    Nothing worse than a surging cam at your cruise speed.

  10. #40
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    there isnt a huge step in ratio between 4th and top gear, the way i see it you just use 5th gear only when you really have to, like cruising on the highway, i do a lot of my driving in 3rd gear and over 80kph i will slot it in 4th if its sustained rpm, it really comes down to driving style and weather it will get lugged down low or kept in the gear that the engine likes to be in.

    the HR238-365 has a lot of advertised duration at 300 deg, id like something around 290 ADV with similar 50, its hard to find the exact lobes you want, crane has some better suited for some applications and comp better suited to others

    example of some comp QXI lobes....... 291 adv with 239 @ 50 and 160 @ 200 with 397 lobe or .655 lift with a 1.65 that would be a nice lobe
    Last edited by HPE PETE; 12-04-2014 at 08:07 PM.

  11. #41
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    PA220320.jpg Although this is not the same as mine will be. It does show a similar look with the finish coatings. From the ASR sump, head spacers, tin covers, TP manifold. Mine will have the YT-3's & TP single plane. The sump will be rocket red as well. No bling! Just a factory look.

  12. #42
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    GMOwnersday2010022.jpg Speaking of Bling, do like this engine bay with the quads. Wonder if that set up can be tuned for Miss Daisy!! lol

  13. #43
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    Quote Originally Posted by 76XSS View Post
    GMOwnersday2010022.jpg. Wonder if that set up can be tuned for Miss Daisy!! lol
    without a problem
    ONE STOP MOTORSPORT SHOP - engine building and development - tuning and complete fuel systems-- latest dyno dynamics dyno --click the link to see our facebook page https://www.facebook.com/pages/Zok-R...9505334?ref=hl

  14. #44
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    cross ram 8 throttle EFI setup would be killer on this engine

    i kinda like the timing cover and water pump painted the same colour as the engine as well.......should have one bank grouted tomorrow on this engine block then the block will be getting bored and torque plate honed next week, one thing i noted about this block is there was absolutely no sign of cap walk or fretting at all with the factory 4 bolt main caps

    heres another stocko locking 355, should look similar to this minus the gay intake manifold, no spacers were required with this engine but they were YT non adjustable rockers, stud mounted rockers fit under the std covers as well.



  15. #45
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    [QUOTE=HPE PETE;643738]cross ram 8 throttle EFI setup would be killer on this engine

    I was thinking about what you said Pete but if I was to go an exotic induction set-up, I still like for the quad Webbers as in the photo. That engine bay just looks killer!!

    While looking into the quad idea; a couple concerns comes to mind after talking to a couple blokes problems who has done their conversion:

    1) The first blokes problem was reversion at high revs. The 44 IDF quads & Cain manifold combo later went on an already prepared 308 Ian Tate motor with a modified Q-jet, the 308 was built for Targa racing. He said he loved it but reversion was the problem mainly on the track under load at max revs. When that happened fuel starvation occurred & the fuel collected in his bonnet scoop (A9X replica). Spirited high rev driving was ok though..

    I was thinking, maybe another cam grind specifically for the quads would have been necessary...thoughts?

    2) The other guy said he had Clive cams do a custom cam grind to overcome the lack of vacuum for the brake booster, while still getting the engine to breathe. His car was more of a hi-po street-er though. He said in hindsight, the 48's were a bit overkill for the engine. He said he spent some time consulting some Webber gurus though.

    Not sure what cubes he had but I'm thinking 308. (Correction 21/4 -stroked to 355)

    I've been doing some measuring & the Aussie Speed quad manifold (same as the Cain in photo) would work best height wise rather than the Redline with the long bolt on runners at this point. the A9X bonnet scoop could convert into an air box..

    Food for thought..waddayareckon Pete, Zok, others?
    Last edited by 76XSS; 26-04-2014 at 07:39 PM. Reason: spelling

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