russxr67

Fwiw,I did some ringing around today to see if it was worth going to all the trouble of offset grinding your stock crank to 3.7 or would it make more sense to buy a crank and or kit ready to go.From what i gathered it seems that grinding your own 4ma down is now really past tense .Cost of grinding came in at 600 bucks.Brand new cast steel Scat crank.Around 700 bucks.Now factor in that you can probably offload your 4ma crank and rods for 350-400 bucks.Doesn,t take much grey matter to work it out.
Seems the whole reciprocating assembly is easier to balance as well with the aftermarket setup .Anyone want to buy a standard size 4ma crank and rods?

claassdj

http://www.fastpts.com/hazel-doc/colaford.html have a look at this interesting stuff

xbhoon

it all comes down to money

offset grinding to 3.7 stroke 5.7 chev rods & pistons to suit is about the cheapest but the rod ratio is not fantastic & not great for high revving engines, were as 408 with 4.0 stroke & 6.0 or 6.125 rods has a better rod ratio for high revving but pistons pin sits under oil ring & have heard of problems with oil consumptionthere earlier on in
production,

the higher rod ratio the the better revving with matching components , piston speed slower in top of stroke to aid in combustion,( ie 351c with 302 rods = aprox 1.7 rr)
(std 351with 5.778 rod = 1.65rr)
(377=3.7 stroke with 5.7 rod=1.54rr) faster piston speeds

here is a link to explain better
http://victorylibrary.com/mopar/rod-tech-c.htm

cheers pete

xbhoon

after reading the article again
it says small ports stick with high rod ratio
big ports syick with bigger ports

TTNOS8

Totally agree russ,

Have a look at the scat website and a 393 rotating assembly with i-beam rods and flat top forgies is less than $1100US!

Now that's cheap

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