Originally Posted by dereknkathy (Post 4271182)

Stroke is cheaper to add later than bore. Crank and pistons instead of block and pistons. Way back in the old days they didnt neasure displacement. They measured bore area. Felt it made little to no diff how far the piston went up and down.

Originally Posted by CDShack (Post 4271227)

SO MUCH CHEAPER in the longrun to bite the bullet and do it all as once.

My machinist has a sign in his shop entry: "SPEED COSTS MONEY..........how fast do you wanna go???"

Originally Posted by BajaIceBreaker (Post 4271175)

I like all the insight. Very entertaining. I think there's a few takeaways from this...

1) Go with the larger bore AND the larger stroke. --> "The no-brainer"
2) Bolt on a blower for more power --> Not really part of the qusstion, and completely complicates the question, but 100% agreed
3) The consensus seems to agree, all things other things considered equal --> No measurable difference

With that in mind... let's throw in a few more variables...
--Now i'm starting to get real to life--
1) Let's consider it's a retrofit hyd roller cam at about 589, 610 lift
2) Aluminum Dart Pro 1 at 310 cc
3) 800 cfm Holly vacuum secondary
4) No room for a blower (blowers are out of the question)
5) OK exhaust (aluminum manifolds with individual runners for only 12 inches)
6) Purpose is to go 60 MPH and drink heavily when I get there in a 13,000# Baja
7) The 4.25 stroke engine is around $3500 the 4.00 stroke engine is around $4000 new (same warranty)

Oh... one more variable.... I'm not going to build them bigger in the future. :(

GO!!!!

Originally Posted by BajaIceBreaker (Post 4272996)

i have 454's and I'm running around 62 mph on a good day.That was before i lost a motor. Not that I really want to go much faster, its a tank. But if i had the same speed and really good reliability, I could be happy. Looking for a good smooth idle, easy starting, and reliability... and hopefully 65 MPH.

Originally Posted by BajaIceBreaker (Post 4272996)

i have 454's and I'm running around 62 mph on a good day.That was before i lost a motor. Not that I really want to go much faster, its a tank. But if i had the same speed and really good reliability, I could be happy. Looking for a good smooth idle, easy starting, and reliability... and hopefully 65 MPH.

Originally Posted by offshorexcursion (Post 4272307)

http://www.offshoreonly.com/classifi...o60249-en.html

Thanks for sharing I'CE. It is interesting all the combos out there. Unfortunately no one has un biased proof on what works best, safestest, most power.

I don't like that combo personally..... Looks like they lowered the compression on a NA supercat combo with a blower stuck on top...

Ilmor did just merge with scorpian race engines...

Originally Posted by Full Force (Post 4273006)

build 540's then!! still should be reliable they wont work as hard as a smaller CI engine to move it....