I need a li'l help n figureing out the year model of my 425,,gathering from the history of olds that i have read,,if the 425 was painted red,it was high comp engine.(as is mine) i am headed to the machine shop in a couple of hours wid the heads and intake,i can tell there has been sum port work,found sum #'s stamped on the front, v25 0602,,this is how they appear,except the V is not srait,its leaning to the left so that the rite side of it is vertical,,maybe an indication of an anglecut of 25,000th???? got an offy intake for it,but will need to get it cut to fit if this is the case..sorry,got sidetracked,,i have so many questions bout this engine,,i know it will be a tire shreader,,its goin n a 1948 chebby truck(lowered & tubbed wid a Trans Am front clip) with a turbo with a switch pitch converter,,there isnt a whole lot of numbers on the engine block,,plus i am a rookie when it comes to olds,,,just wanted to do it diff to give all my chevy buddies sumthin to cry bout,,,but i am finding the olds history an this engine in particular,,really fascinateing,i wood luv to kick a few of my buddies ole chevys in the butt with this one,,,#'s on the front of the block are 386525 A 1,,,,,rear by the dist,,3,under this is 71 with the snowflake emblem followed by CFD rite below it,,,,, the #'s on the heads are 383821,,,any help u can provide will be greatly appreciated!!!! looking forward to a great learning expieriance !!! be gentle,,i am a rookie!! lol,,thanks , DAVE

 

just learned something else!! useing the 460 ford rear seal,,any modifications needed or is it a direct drop in???

 

Its a direct fit no mods required

 

thanks,i will use it then,,i am not a real fan of the rope seals..

 

Hi Dave, enginecode 386525 code A block is a 1965 425, the c-heads code 383821 is 1965 400/425 code A heads on the right c-head there should be a stamped number (front of the engine passenserside) example NS123456 /425cid 370hp, this is the code to identified the engine. Not all red engines are high comp. i own a 1967 425 whit the low comp. 9.0:1 300hp and is red the diffrent color is the Toronado did have a metallic bleu high comp. 380hp engine. Most 425 1965 to 1967 (exept the toronado engine is 39 degree cam angle) do have the 45 degree cam angle, later 1967 425 and all other later olds engines did have the 39 degree cam angle Hope did help you a litle. Berend

 

thanks a bunch,,i have a lot to learn bout these engines,, the only numbers i can find on the front of the heads are,,,,v25 0602,,,,but everything else appears to b as u say!!! I have everything cleaned, painted,honed and waiting on the main bearings,(should b here by next tuesday) really lookin forward to hereing this baby run once more!!

 

Sounds like a cool project. I also like the 425. Not to may around and people really dont use them much. Got an pics. If its a 65 425 it would have come with the A heads. There should be a big letter my the # 1 and #8 sparkplug holes. You cant miss it! Also should be a flat spot with a code right at the #1 cylinder on the block. We need pics of the project please! LOL

 

Hi Dave, like f-85 wrote, check the big letter on your heads!
The only Thing that did mach is the letter V bud that would be for an 1965to1967 400cid 442 engine, perhabs someone did change the heads sometime?! And f-85 wrote we neet pics, please show us what we neet to help you and idetefied your engine. Berend

 

i thank all of u for the great info on everything,,,, the heads do have the A on the #1 & 8 cylinder... i uploaded a few pics of the project in the pic gallery,,haven't figured out how to upload them n the forum area tho!! a computer and i r not the best of friendz!!! lol,,,hey,thanks again for all the info on this project,,,i think the weight will be down roun 3600 pounds(hey,,i can dream,can't i? the ole dragracer comes out in me sumtimes,lol) r so,,,i got a tube chassi's out back with a 3 iinc bar setup wid narrowed 12 bolt,,,a trans-am front clip,,a one piece aluminum raised floor covering the meats under the bed,,i think this combo with the 425 a li'l more than stock and the turbo 400 with the switch pitch should make for sum FUN TIMES!!!DAVE.