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How to fit a Chev 307 Radiator fitted to 186 engine - Taxi pack? - How to fit a Chev 307 Radiator fitted to 186 engine - Taxi pack?
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htprem Offline
#1 Posted : Monday, 6 October 2025 9:33:24 AM(UTC)
htprem

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Hi All,

I am wondering how to fit a Chev 307 Radiator to a 186 engine, running a Powerglide. The car has dealer fitted Repco Cooldrive under dash aircon (works a treat), but things heat up a bit on a hot summer's day and am looking at ways to improve the cooling for the old girl. The engine has a 6 blade fan fitted which was part of the old Repco kit.

I have been told the 6 cylinder cars that came with factory aircon and cars that were ordered with the so called Taxi Pack were set up this way - I don't know if this is correct or not.

I have the 307 auto radiator, shroud and a few other pieces, but I have noticed that the radiator inlet and outlet pipe sizes do not match the standard 186 engine inlet and outlets.

Any advice or know how would be appreciated.

Thanks

htprem

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HK1837 Offline
#2 Posted : Monday, 6 October 2025 2:05:52 PM(UTC)
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You'll have to get the outlet ports changed to 6cyl. I think the top one on a SBC is the same size as the lower one on a 6cyl so you should be able to get that one moved. The other way is to get a HJ to HZ 6cyl HD one and use it.
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htprem Offline
#3 Posted : Tuesday, 7 October 2025 12:09:15 PM(UTC)
htprem

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Hi HK1837,

Thanks for your advice - so its as simple as changing the inlet and outlet pipes on the radiator I have with the ones from a standard 6 cyl radiator.

Is the HJ-HZ Heavy Duty one the same size as the 307? Am asking as my understanding is that if I remove the spacers on the 6 cyl radiator setup, then the 307 radiator bolts straight in to the 6 cyl car without any modifications to the car body.

Thanks again

htprem
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HK1837 Offline
#4 Posted : Tuesday, 7 October 2025 1:44:42 PM(UTC)
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HJ-HZ fit, you just have to drill some holes in the front as the mounting holes are different. It otherwise works OK.

Yes a 307/327 one will fit exactly where a 6cyl one was. The only issue will be the V8 shroud probably wont work with a 6cyl but it will be relatively close - I used to use 6cyl HJ-HZ aircon car shrouds on SBC in HQ-HZ. It might be worth playing around with a viscous fan and the 307 shroud and see how it goes.
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htprem Offline
#5 Posted : Tuesday, 7 October 2025 7:29:25 PM(UTC)
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Thanks again HK1837. Appreciate your valuable advice.

Cheers

htprem
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