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slotracer
07-03-2006, 08:13 PM
what size rods and piston's and crank do you need to make a 496? have a bbc thats 30over, stock rods. what do i need? i have a set of 990 heads already.
sanger rat
07-03-2006, 08:22 PM
60 over, 4.25 crank and 6.385 rods.
Fiat48
07-03-2006, 08:29 PM
With 6.135 rod = 1.520 comrpession height pistons.
With 6.385 rod = 1.270 compression height pistons.
slotracer
07-04-2006, 06:34 AM
ok really got me loss now.
With 6.135 rod = 1.520 comrpession height pistons.
With 6.285 rod = 1.270 compression height pistons.
what crank would i use?
Fiat48
07-04-2006, 07:24 AM
Like he said 4.250 stroke with a .060 overbore.
Norseman
07-04-2006, 07:39 AM
With 6.135 rod = 1.520 comrpession height pistons.
With 6.285 rod = 1.270 compression height pistons.
Which makes a better combination??
Fiat48
07-04-2006, 07:54 AM
6.385 long rod (I see I typed it wrong above) would be the preferred.
FASTRAT
07-04-2006, 08:39 AM
just food for thought!!...4.280 (.030) x 4.250= 489ci...7ci difference & alot less money to spend...if u have 1.52 CH pistons, u can use 6.135 rod...then all u need is the crank...no boreing...no rods & pistons...much better cost effectiveness!...just my .02 cents
fastrat
slotracer
07-04-2006, 08:44 AM
just food for thought!!...4.280 (.030) x 4.250= 489ci...7ci difference & alot less money to spend...if u have 1.52 CH pistons, u can use 6.135 rod...then all u need is the crank...no boreing...no rods & pistons...much better cost effectiveness!...just my .02 cents
fastrat
so if i already have the block and pistons and rods all i would need is a crank and i would have a 489. is this correct?
Fiat48
07-04-2006, 09:07 AM
Depends on what the Ch of the pistons you now have are. If they are standard pin location pistons for a 454...then you are gonna need new pistons....because using the stock piston is going to put the piston 1/8" out on the deck height.
FASTRAT
07-04-2006, 09:17 AM
so if i already have the block and pistons and rods all i would need is a crank and i would have a 489. is this correct?
Yes, as long as the pistons are 1.52 CH...then all u need is the crank...shop around...SCAT, EAGLE, Etc...std/std is what u want...are the pistons forged?...full floating pins?...good full floating steel rods?
fastrat