[331STANG]

Which is better? Im in the planning stages of a 360 ci... 3.25 crank or 3.4?

[Sleeper_Stang_89]

doesnt the smaller stroke rev quicker???

[sn94]

yes the smaller the stroke, the faster it revs up
If you want to run alot of boost or run an efficent boost set up , the smaller stroke will help with the boost. A larger stroke as in either a 331-347 wont be essential for boost. A lot of fast drag racers prefer a 302 bored to a 306, and run alot of boost. A Nice DSS 306 is a great setup.


PaT #06

[Sleeper_Stang_89]

larger bores promote better breathing... but will the difference b very evident in the situation that 331 stang stated? a 3.25 crank with a standard 4.185 bore makes 357.6 ci and a 3.4 stroke with a standard 4.125 bore makes 363.5 ci... assuming the same supporting hardware (intake, cam, etc.) which makes the quicker e.t?

[OneBad90]

Iv'e Always Appreciated the Big bore,Short Stroke

[Sleeper_Stang_89]

me too... but is there enough of a difference to choose the shorter stroke in the application 331stang mentioned? for discussion purposes...

[JBIGBOOTSY]

The more power an engine makes, the faster it revs. the short stroke/high rpm idea, really dosent determin the rev abilitys of an engine. The valvetrain does.

[Sleeper_Stang_89]

so the engine with the most power will always accelerate faster?

[JBIGBOOTSY]

Yes. When it comes to a car engine. No. if you comapre a race engine to a Dremmel.

[Sleeper_Stang_89]

so in the case of the 3.25 crank vs the 3.4 in larger bore motors they rev relatively the same seeing as how a 357 and a 363 would make about the same hp.

[1slo5.0]

Originally Posted by 331STANG Which is better? Im in the planning stages of a 360 ci... 3.25 crank or 3.4?

Large bore is better than a small bore in most cases because it unshrouds the valves more than a small bore does. Run the largest stroke that the heads will keep up with. More cubes equal more power unless the heads can't keep up with the airflow requirements.

[331STANG]

Thanks Darrell, that was the info I was looking for.

[Iownastang]

What kind of block are you going to be using?

[331STANG]

Originally Posted by Iownastang What kind of block are you going to be using?

This will be a dart block

[331STANG]

Originally Posted by Darrell Large bore is better than a small bore in most cases because it unshrouds the valves more than a small bore does. Run the largest stroke that the heads will keep up with. More cubes equal more power unless the heads can't keep up with the airflow requirements.

The plan is Highport 225's from TEA or my Canfield 195's with port work and 2.055 valves.

[331STANG]

Originally Posted by sn94 yes the smaller the stroke, the faster it revs up If you want to run alot of boost or run an efficent boost set up , the smaller stroke will help with the boost. A larger stroke as in either a 331-347 wont be essential for boost. A lot of fast drag racers prefer a 302 bored to a 306, and run alot of boost. A Nice DSS 306 is a great setup. PaT #06

If this is true why are the Drag Radial guys in NMRA running 360 ci engines instead of 306's ?

[1slo5.0]

Originally Posted by 331STANG The plan is Highport 225's from TEA or my Canfield 195's with port work and 2.055 valves.

Both are good heads. Just make sure if you have any porting done have it done by a reputable shop like TEA.

[1slo5.0]

Originally Posted by 331STANG If this is true why are the Drag Radial guys in NMRA running 360 ci engines instead of 306's ?

Because its not true. Cubic inches makes horsepower plain and simple. Those guys are running 360 inch engines because rules allow it and they can make more power with the bigger engine.

[331STANG]

thats what I was thinking...

[331STANG]

Originally Posted by Darrell Both are good heads. Just make sure if you have any porting done have it done by a reputable shop like TEA.

I've never ran heads done by TEA, but hear nothing but good things...