Engine Size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mneubecker · 03-01-2009, 04:35 PM

I'm trying to determine if I have a 230 or 250. I finally got my 66 long step back from the bodyshop and was able to write down some numbers. They were hard to read even after several attempts at cleaning so they may not be 100% correct (especially the one on the flat pad by distributor.

Here's what I have - drivers side manifold 3859381 GM 17, passenger side near dipstick Con2 F227, flat pad by distributor 0625tf, passenger side between dipstick and distributor 3921968.

Can anyone tell me what engine size I have based on those numbers?

Also, from the drivers side kick panel I have paint code 510aa - I believe that's turquoise? The trim just says "std", I was hoping it would tell me the original color.

Thanks for your help.

mneubecker · 03-03-2009, 02:18 AM

Anyone?

TimE · 03-03-2009, 08:41 PM

On Inliners.org under casting #'s the 3921968 is listed as 230-250 from 1964-1976. That's all I found in few minutes. Try searching and see if you can come up with anything more detailed. Good luck.

I just thought, on my '66 250 there is a "4.1L" stamping (I don't recall exactly where right off) but that denotes a 250.

low900rr · 03-03-2009, 09:12 PM

Its a 250 if its a 66 and the numbers and letters by distributor are TF, last year for the 230 was 65.

ol Curt · 03-03-2009, 09:38 PM

I don't have reference in front of me to look up your code, but I'll dig thru some literature tonight. Actually, the 230 was still in production in 66...but 66 was the first year a 250 was available in the trucks. The stamping on the flat pad behind distributor is the one to use if you want to know compression ratios and such. But the one on the block will tell where it was made and the size. I don't find that block number listed anywhere.

ol Curt · 03-03-2009, 10:10 PM

Sorry, I wasn't reading it all. I was using your manifold numbers. Low90 is correct. I think the only way to tell the difference between the 230 and the 250 would be internals. I think the piston tops were different.

low900rr · 03-03-2009, 10:15 PM

the 230 wasnt offered in the 66's according to my literature

ol Curt · 03-03-2009, 10:23 PM

Point well taken. Mine was that it was available in cars and with it being 40 years old it would be hard to say it was original to the truck.

mneubecker · 03-04-2009, 08:04 PM

Thanks for all the info! I got the truck from my Grandfather and he had told me at one time that he had to put a new engine in it. I can't remember the details or how long he owned it before he made the switch but it sounds like that fact will make it more complicated to determine the size.

ol Curt · 03-05-2009, 11:41 PM

Well, if it helps, the parts are interchangeable. I think the only difference was one had domed pistons and the other didn't. I think the 250 had a little longer stroke. I would call it whatever you choose till you can tear it apart and go from there.

Nobody else will be able to tell the difference either.

TheDark1 · 03-06-2009, 12:06 AM

230 cid- 3.875 bore x 3.250 stroke
250 cid- 3.875 bore x 3.530 stroke

03-01-2009, 04:35 PM	#1
mneubecker Registered User Join Date: Jan 2009 Location: paola ks Posts: 30	Engine Size I'm trying to determine if I have a 230 or 250. I finally got my 66 long step back from the bodyshop and was able to write down some numbers. They were hard to read even after several attempts at cleaning so they may not be 100% correct (especially the one on the flat pad by distributor. Here's what I have - drivers side manifold 3859381 GM 17, passenger side near dipstick Con2 F227, flat pad by distributor 0625tf, passenger side between dipstick and distributor 3921968. Can anyone tell me what engine size I have based on those numbers? Also, from the drivers side kick panel I have paint code 510aa - I believe that's turquoise? The trim just says "std", I was hoping it would tell me the original color. Thanks for your help.

03-03-2009, 02:18 AM	#2
mneubecker Registered User Join Date: Jan 2009 Location: paola ks Posts: 30	Re: Engine Size Anyone?

03-03-2009, 08:41 PM	#3
TimE Hey Y'all!! Join Date: Dec 2007 Location: Bay Minette, Alabama Posts: 1,755	Re: Engine Size On Inliners.org under casting #'s the 3921968 is listed as 230-250 from 1964-1976. That's all I found in few minutes. Try searching and see if you can come up with anything more detailed. Good luck. I just thought, on my '66 250 there is a "4.1L" stamping (I don't recall exactly where right off) but that denotes a 250. __________________ Just hopin' I live long enough to finish something!!!

03-03-2009, 09:12 PM	#4
low900rr Registered User Join Date: Jul 2008 Location: Warren Mi. Posts: 136	Re: Engine Size Its a 250 if its a 66 and the numbers and letters by distributor are TF, last year for the 230 was 65. __________________ My builds 69 stepside.......2wd to 4wd http://67-72chevytrucks.com/vboard/s...d.php?t=330675 and the new 66 http://67-72chevytrucks.com/vboard/s...d.php?t=302321 Last edited by low900rr; 03-03-2009 at 09:14 PM.

03-03-2009, 09:38 PM	#5
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: Engine Size I don't have reference in front of me to look up your code, but I'll dig thru some literature tonight. Actually, the 230 was still in production in 66...but 66 was the first year a 250 was available in the trucks. The stamping on the flat pad behind distributor is the one to use if you want to know compression ratios and such. But the one on the block will tell where it was made and the size. I don't find that block number listed anywhere. Last edited by ol Curt; 03-03-2009 at 10:07 PM.

03-03-2009, 10:10 PM	#6
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: Engine Size Sorry, I wasn't reading it all. I was using your manifold numbers. Low90 is correct. I think the only way to tell the difference between the 230 and the 250 would be internals. I think the piston tops were different. Last edited by ol Curt; 03-03-2009 at 10:13 PM.

03-03-2009, 10:15 PM	#7
low900rr Registered User Join Date: Jul 2008 Location: Warren Mi. Posts: 136	Re: Engine Size the 230 wasnt offered in the 66's according to my literature __________________ My builds 69 stepside.......2wd to 4wd http://67-72chevytrucks.com/vboard/s...d.php?t=330675 and the new 66 http://67-72chevytrucks.com/vboard/s...d.php?t=302321

03-03-2009, 10:23 PM	#8
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: Engine Size Point well taken. Mine was that it was available in cars and with it being 40 years old it would be hard to say it was original to the truck.

03-04-2009, 08:04 PM	#9
mneubecker Registered User Join Date: Jan 2009 Location: paola ks Posts: 30	Re: Engine Size Thanks for all the info! I got the truck from my Grandfather and he had told me at one time that he had to put a new engine in it. I can't remember the details or how long he owned it before he made the switch but it sounds like that fact will make it more complicated to determine the size.

03-05-2009, 11:41 PM	#10
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: Engine Size Well, if it helps, the parts are interchangeable. I think the only difference was one had domed pistons and the other didn't. I think the 250 had a little longer stroke. I would call it whatever you choose till you can tear it apart and go from there. Nobody else will be able to tell the difference either.

03-06-2009, 12:06 AM	#11
TheDark1 Intentionally Left Blank Join Date: Dec 2008 Location: Broussard, LA Posts: 355	Re: Engine Size 230 cid- 3.875 bore x 3.250 stroke 250 cid- 3.875 bore x 3.530 stroke __________________ 1965 C-10 Short Fleet 468/TKO 5-Speed 2004 2500HD Crew 496/Ally Blacked Out (SOLD!!) 1997 Formula WS6 2004 Jeep Wrangler (Sold) 2013 Jeep Wrangler (Sold) 2017 Jeep Wrangler (Blacked Out on 35's) 2011 GMC D-Max Dually Denali 3500HD (Sold) 2015 GMC D-Max Dually Denali 3500HD (Sold) 2018 GMC D-Max Dually Denali 3500HD (Sold) 2020 D-Max Dually Denali on 33x12.50's 1979 GMC Short Bed Step-Side 4x4 350/350 Low Miles



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