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Hi all.
I have an HZ van with a 253 and Trimatic. I always thought the motor was stock but when I take off from a standing start, the car is a bit slow till the rpms reach about 2500 and then it "turns on", at least the best a 253 can do. I'm thinking it might have a warm cam in it even though the idle is smooth. What I would like to know is, should I put a 2000 rpm-stall torque converter in it so that I can get into the power band quicker? ( I did a stall test and it stalls at about 1200 rpms at the moment.)
Also after I fit some extractors, I was thinking about replacing the Stromberg 2 bbl. Which would be better on an almost stock motor, a 350 cfm Holley 2 bbl or a 465 Holley 4 bbl. I intend keeping the motor close to stock, just want it to go a bit quicker with minimum money spent. (Don't we all!!!)
Hope someone can steer me in the right direction.....Russell.
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Hi Russell,
With that combo, and by the way you describe its take-off, it sounds like you have a 2.78:1 diff.
A stock 253 develops maximum torque at about 2400 rpm (about 50 - 60 kmh in 1st with a Tri and 2.78 diff and about 110 kmh in top). So, you
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Thanks for the info, Dave.
I always assumed it had a 308 diff in it, maybe not.
It does about 40 kph/1000rpm. Would that be a 3.08 or a 2.78 diff?
Also, looks like I will have to buy a 4bbl manifold for the Holley 465/450. What would be a reasonable ma
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Hi Russell,
It may have a 3.08....I distincly remember mine doing 2,400 rpm at 110 kmh...spot on max torque for an HQ's 253.
If it was an early V8, I'd say go for a stock Holden manifold. On an HZ, I dunno (I haven't played with heads with EGR ports
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Hi Russell,
To make it a bit quicker eh ? I too have a stock HQ 253 - tri - strommy setup. Mine doesnt take off at 2500. It goes from zero ! If I plant my foot it beats most new cars by a mile except Ford XR8turbo who beat me once i get to 60kph. LOL
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Before building the hot 308 for it, my bro-in-law startd with a stock 253 HZ Kingswood SL.
What realy woke it up as a stocker was fitting the HEI dizzy from a blue motor, and using a VK manifold & rejetted VK 5L quadrajet. It would be easier to get one |
Cheers,
Mick
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Buy a KC 253/308 valley. It fits all red, blue and black motors up to VL (but not Walkinshaw). It's a copy of a VH/VK group III valley. Greg at Classis Oz Wreck had one a while back. |
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