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birkey 10-19-2012 12:22 AM

Nascar specs.
Anyone know r/s and b/s #'s. or simply bore and stroke with rod length? MAYBE some cam specs??

idontdrivericeieatit 10-19-2012 01:08 AM

358 ci and Bore is 4.185 max. the stroke is3.25 rods are 6. And 6.2 inch it has 8.40 solid lift cam 2.18 intake vavle and 1.65 exhaust vavle 9.inch deck height 12.1 compression max

idontdrivericeieatit 10-19-2012 01:12 AM

Now them spec are for the chevy dont know ford I would think they close as they all build by same rules I think I read that ford uses a little smaller bore and little more stroke dont know for sure but all the info is on Google if u want to check

birkey 10-19-2012 01:55 AM

Maybe I'm missing something, 8.40??

idontdrivericeieatit 10-19-2012 02:13 AM

840 intake and 840 exhaust lift thats the cam lift

idontdrivericeieatit 10-19-2012 02:16 AM

Yeah sorry not 8.40 its 840 lift dang auto correct

E.Furgal 10-19-2012 06:08 AM

every engine package for every track is different..

idontdrivericeieatit 10-19-2012 12:29 PM

You can buy the engines from the race teams if u have the money but not for street at all they are only meant for bout 1000 miles at 9000 plus rpms nothing u would want on the street and yes they are a little different depending on track they at but they are still bound by a few rules that are the same no matter where they are like no more than 358ci no more than 12.1 compression they do reduce bore and add little more stroke at some tracks but wasent going list engine for ever track out there the one I gave is what is said be most common chevy set up

BogiesAnnex1 10-19-2012 01:30 PM


Originally Posted by birkey (Post 1600722)
Anyone know r/s and b/s #'s. or simply bore and stroke with rod length? MAYBE some cam specs??

NASCAR doesn't directly spec the bore, stroke, or rod length; they specify a max displacement of 358 cubic inches, a bore center to center of 4.47 inches, a block height from mid-crankshaft line to head deck of 9 inches. After that you're fairly free to fill it up with parts that fit inside.

That's not to say there aren't a lot of rules about the details like lifter bore of .825 inch and cylinder wall finish and many other annoyances.

Frankly, I really like southern style run what you brung racing. NASCAR seems silly to me to put out a bunch of rules under the guise of holding down cost for a bunch of million/billionaire good-'ol boys so the average guy can compete. They are crapping on my brain, one of those cars costs more than my house and I live in a pretty pricey part of town.


E.Furgal 10-19-2012 01:42 PM

car is 119k
engine another 40-50k

idontdrivericeieatit 10-19-2012 01:45 PM

That is true but they do say bore cant be above 4.185

lmsport 10-19-2012 02:21 PM

I think the Cup series engines still run mushroom lifter flat tappets. A lift rule would something new to me also.

Silver Surfer 10-19-2012 03:03 PM

Oldbogie posted this on one of the threads I started a while back. It is a very fascinating read.
Chevy Nascar Engine - Nascar's New Chevy - Hot Rod Magazine

BogiesAnnex1 10-19-2012 05:22 PM


Originally Posted by idontdrivericeieatit (Post 1600872)
That is true but they do say bore cant be above 4.185

That's true but it leaves a.145 wall which should make the risks of larger bores evident without even mentioning.


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