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Old 01-01-2009, 02:40 PM
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What engine to choose?

Gidday, yous may think this is just the same old question everyone asks which it may be but its for my personal use.
I am choosing an engine for my 1500kg holden premier (new zealand car)
I have the parts to build either engine, Im not after the engine with the most horsepower, but more which will be the most fun to drive on the street, not easy to drive but fun to drive.
I am either going 350 or 307 although most dont like the 307.
The 350 has 30 over pistons ( a copy of an old trw piston) which should produce 10:4 comp with 64cc heads. 462 heads 2.02/1.6 ported out and milled. victor junior gasket matched. 750 vac.

307 would have 40 over pistons from local parts shop which supposed to put out 9.9 compression with 64cc. 291 heads 1.95/1.5 ported. performer manifold gasket matched 600 holley.

both engines will run basic hei ignition setup with flows. have both 1.5 and 1.6 roller rockers and 2 cams to choose from.

a local kelford cams grind adv dur 274/282 at 50"232/238, lift 500, and edelbrock performer cam 308/318 at 50"234/244 lift 488/510. i dont know what cam would suit what or even if they will but thats what I have. Both are hydraulic flat. What would be the most enginoyable engine to run in my street car, any idea of hp would be good to not that it matters. Will be running on pump gas 98 octane. thanks guys

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Old 01-01-2009, 02:42 PM
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sorry about some of the spelling mistakes, i must of been thinking of other words as I was writing. Gearing has yet to be chosen but looking at 3.5 rear end and running a turbo 350. thanks
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Old 01-01-2009, 02:57 PM
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can get my hands on smaller cams through keford as well, 268 grind, which they say is their biggest without needed hi stall and smaller cams as i think 307 would respond better to a smaller cam
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Old 01-01-2009, 03:04 PM
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I would go with the 350. What is the lsa on the Kelford cams ? I would no doubt use one of those and match it to my torque converter.
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Old 01-01-2009, 03:10 PM
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No question, 350.
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Old 01-01-2009, 03:13 PM
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Cheers for that. Yeah everyone has said to me the 350 but my father always used 307 03 327, loves the way they rev or something and pushing me to go with 307. with what I have will it put out much power..
What does LSA mean when use asked for lsa of kelford?
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Old 01-01-2009, 04:12 PM
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I will take the car to the strip only once a year, and if it was running 350 Id hope for 12's 307 13's. car is 1.5tonne in weight, would either of the options make it to those marks with what i have, .
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Old 01-01-2009, 07:00 PM
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LSA is lobe separation angle. LCA is lobe center angle. LDA is lobe displacement angle. They all mean the same thing. It's the average of the intake centerline and the exhaust centerline which are ground into the cam at manufacture. For instance, here's a cam from Comp that is ground on a 106* intake centerline and a 114* exhaust centerline. Add the two together and divide by 2 and you have the LSA, 110*.
http://www.compcams.com/Cam_Specs/Ca...x?csid=72&sb=0
Although a cam can be referenced to the crank differently (advanced or retarded), the LSA remains the same. It is ground into the cam at the time of manufacture and can only be changed by re-grinding the camshaft to a different spec.
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Old 01-01-2009, 07:07 PM
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lobe seperation is 109, if that helps anyone, cheers, which should be 110 as it says on spec sheet 106*intake, 114*exhaust just lik4e the one you mentioned.. this is just direct off their site
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Old 01-01-2009, 07:08 PM
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http://www.camshaftshop.co.nz/index...._view.tpl.html
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Old 01-01-2009, 11:16 PM
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I'd go with the 350 for 2 reasons. More cubic inches and bigger bore to unshroud the valves. Every little bit helps.
I was just fiddling around on the DynoSim for another fellow and still had most of the data in there that will work for your motor, so changed heads and cam and here are the results.....
This is with 10.4:1, your ported 462 heads, 750 carb, hi-flow 180* intake such as Edelbrock RPM or Professional Products Typhoon intake, #52021 ($130 on ebay) or Crosswind Air Gap, #52026 ($170 on ebay) and 1 3/4", long-tube, equal-length headers. CompCams Part #12-326-4, grind 286H, 286/286, 236/236, 0.522"/0.522", 110* LSA, install 4* advanced. This dynosim is less mufflers....
RPM HP TQ
2000 143 375
2500 197 415
3000 236 414
3500 284 426
4000 333 438
4500 373 435
5000 406 427
5500 430 411
6000 437 382
6500 434 350
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Old 01-02-2009, 12:51 AM
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Gidday, really. thats easily what I am after. Can an perfermer rpm produce that much. Probably better option than the victor jr then as it will give me a bit more down low and still up high. Well thats made my day, thanks for that. Gunna go try find a program like that for myself.
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Old 01-02-2009, 01:17 AM
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My old engine was quite similar to the 350 option.
It has served me well in a daily driver Camaro (about similar weight as your car) and I got 13.51/105 on the quarter on street tires. Invest in a 3000 rpm or so converter and 3.xx gears (I run 3.42) and youŽll have a daily driver with a lot of grunt that wonŽt ruin you for fuel
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Old 01-02-2009, 01:36 AM
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good to hear. looks like i'll be doing the 350 option.
now to decide on performer rpm or victor junior. take it the perf rpm will be more streetable? i was looking at a 2500 stall as more available on our local trading sites compared to 3000stall. was looking at about 3.5 rear end anyway as it only has 2.7 at moment. by changing the gearing will it feel much quicker down low or not really noticeable? also vac sec carb or should i look at a double pumper? cheers, this is awfully helpful, can start getting it all sorted out
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Old 01-02-2009, 01:51 AM
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I have not tried the Victor Jr but if youŽre looking at a 2500 stall converter I would go with the Performer RPM intake. It will build a lot of power in low-mid range but still roar up to above 6000 rpm. I do run a Team G, similar to the Victor Jr but I have 3000 stall and a more agressive cam
There are two reasons why you should change your rear gear ratio.
1) You will get mor acceleration
2) If you run a stall converter on 2.73 gear it wil slip continously. This will build a lot of heat and may damage your tranny and converter. A separate radiator is recommended anyhow.
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