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Canadian Poncho Homepage -> Canadian Poncho -> The Lounge -> LS9 1975 Chevrolet ? what HP rating?
Post Info TOPIC: LS9 1975 Chevrolet ? what HP rating?
rabbit64cs


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LS9 1975 Chevrolet ? what HP rating?
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I was looking at my mobile storage shed  , a 1975 chevy sport van, the RPO tag lists the engine as a LS9 ? I can't find any reference to HP on the net, seems to be a 1 year only code , other the new version?  I was happy to see it also has a M40 ( T400).   

the thing runs like a top , my uncle who I bought it from was a master mechanic, kept it running strong,  They quite driving it due to health and the van was rusting out .  My uncle wanted a token fee for the van ....I'm a big spender !!! It cost me another $20 to take the mouse infested camping matress to the dump !!

LOL !




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later...rog

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unclebernie


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This was all I could find on this.....what was the suffix code??? 

1975 TXB 350 conv.cab LS9 165hp 4bolt- C-20 to 3500

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John

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427carl


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LS9350/V 8175275K10,K2073-86


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rabbit64cs


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I went out to find the suffix code...NOT A CHANCE I'm going to see that without some major disassembly !!

nice to see that it looks to be a 4 bolt main block , not that I build HP that require it ,,just nice to know.

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4SPEED427


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rabbit64cs wrote:

I was looking at my mobile storage shed


LOL, I thought I was the only one who called my Astro van that!!!

 



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CdnGMfan


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What series is your 1975 Sportvan? 10, 20 or even 30? The series 10 used a catalytic converter; vehicles with 6000+ lb. GVW (series 20 & 30) had less stringent emission standards and went without the catalytic converter.

According to the factory published 1975 literature the LS9 was conservatively rated at 160 net h.p. @ 3800 rpm; 250 lbs/ft (net) @ 2400 rpm. The block may or may not be a 4-bolt main; I would expect a 2-bolt main. Compression ratio was 8.5:1.

The M40 code was thrown around fairly lightly back in 1975 and was used to designate both the TH350 & TH400. Technically the TH350 should have been coded as an M38 & the TH400 as an M40 but they didn't want to do that for some unknown reason in 1975. Behind your LS9 I would expect a TH350 (there's nothing wrong with them; they are compact, light, durable, don't soak up a lot of horsepower and they perform well).

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In garage, 296 cid inline six & TH350...

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