I saw a thread on here that said boring .015 over would be safe and it would put it at a nice 342. I think the gt500 has a 330 in it. Would the gt motor in this case be better than the gt500 b/c it is aluminum instead of cast iron?
5.4 = 330I beleive the GT500 motor is about 320ci.
No it doesn't..015 over in a 4.6 or 281 = 296
For those of you who do not know the formula..........
Bore X Bore X Stroke X .7854 X 8 = cubic inch
Increase the bore or the stroke (or both) and you increase cubic inches. Pretty simple. The limiting factors are the block. There is only so much material you can remove by boring a stock block. Once that is done your option becomes resleeving the block or using a "big bore" block from FRPP.
With a stroker crank you will also get either shorter connecting rods or a piston with a pin located higher up in the piston. Sometimes both. The limit there becomes how far the connecting rod pulls the piston out of the bottom of the bore at the Bottom Dead Center position.
As stated by others, common stroker crank setups utilize the 3.700", 3.750" or the 3.800" strokes. All of these will put you right at 300" with a stock bore block. With the above formula you can see for yourself. The FRPP big bore block and the Darton Sleeve System will give you a 3.700" bore to work with. Utilizing one of these with a stock stroke crank you will again be in the 300" area.
Put the big bore and the stroker together and you end up in the 323" area. All of this applies to the 4.6 based engines. The 5.4 engine utilizes the same bore as the 4.6 but uses a 4.160" stroke, a much longer connecting rod and a taller deck height block.
Class dismissed. This information will be on the mid-term.
THAT is exactly what I would like to know. The bore on the "big bore" FRPP blocks is 3.700". With a 3.750" crank you have 325" on a .015 overbore. With a .010" overbore and a 3.750" stroke you get a 324" engine. Did someone transpose a number? Say....it was supposed to be a 324" engine and somebody's dyslexia kicked in????How is adam figuring I'll have about 342 cubes with the big bore (3.850" {I think} crank, custom wrist pins on .015 over pistons, and I forgot the rods but the point is how is he getting 342 out of the big bore?
That would work out to 330". 3.720" bore X 3.800" stroke.I've got to talk to him on Monday but my understanding is that I'm getting right about 340-342 with a 3.800" crank & .020" overbore with something else relating to the rods as well.
With a 3.705" bore and a 3.75 crank=324" With a 3.800"=327.7 or 328". Somebody spilled beer in their calculator.ChevyKiller said:Keeping with the math, I also do not see how cali HP is getting a 326 with a .005" over?