What HP rating for this Goodwrench 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tucson38 · 09-18-2016, 12:27 PM

I replaced the 350 in my truck in 1998 but I don't have any info on the engine specs. The original part # was 12514695 later changed to 12580974 by GM.

It's a 4-bolt HD tow engine but that's all that I have.

Can anyone ID the HP rating of this engine or give me a heads up on how to find out? Internet searches have not yielded any info on this and GM doesn't respond to my requests.

Matt Man · 09-18-2016, 12:51 PM

There are 2 version of the pre 86 goodwrench 350 engines. One is the 195hp with a smaller cam, however you can get up to 260hp out of this engine with different add ons. The other is the 290hp with a larger cam. Most people opt for the 290hp version. These are both 4 bolt main blocks.

Tucson38 · 09-18-2016, 01:07 PM

Thanks for the information. Is there a way to tell which version I have?

Matt Man · 09-18-2016, 03:13 PM

Look for the number on the back near the top of the block on the drivers side near the firewall. Can be seen from looking from the top.

More info: http://www.mortec.com/location.htm

09-18-2016, 12:27 PM	#1
Tucson38 Registered User Join Date: Aug 2011 Location: Tucson Arizona Posts: 164	What HP rating for this Goodwrench 350 I replaced the 350 in my truck in 1998 but I don't have any info on the engine specs. The original part # was 12514695 later changed to 12580974 by GM. It's a 4-bolt HD tow engine but that's all that I have. Can anyone ID the HP rating of this engine or give me a heads up on how to find out? Internet searches have not yielded any info on this and GM doesn't respond to my requests.

09-18-2016, 12:51 PM	#2
Matt Man Registered User Join Date: Oct 2009 Location: Buhl, Idaho Posts: 1,438	Re: What HP rating for this Goodwrench 350 There are 2 version of the pre 86 goodwrench 350 engines. One is the 195hp with a smaller cam, however you can get up to 260hp out of this engine with different add ons. The other is the 290hp with a larger cam. Most people opt for the 290hp version. These are both 4 bolt main blocks. __________________ 86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903

09-18-2016, 01:07 PM	#3
Tucson38 Registered User Join Date: Aug 2011 Location: Tucson Arizona Posts: 164	Re: What HP rating for this Goodwrench 350 Thanks for the information. Is there a way to tell which version I have?

09-18-2016, 03:13 PM	#4
Matt Man Registered User Join Date: Oct 2009 Location: Buhl, Idaho Posts: 1,438	Re: What HP rating for this Goodwrench 350 Look for the number on the back near the top of the block on the drivers side near the firewall. Can be seen from looking from the top. More info: http://www.mortec.com/location.htm __________________ 86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903

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