ideas for an engine

[cwyates4]

I just purchased a 1983 crossfire 305 shortblock with a few extras. Does anyone have any good ideas to make this engine really run?

[maxwedge]

Originally Posted by cwyates4

I just purchased a 1983 crossfire 305 shortblock with a few extras. Does anyone have any good ideas to make this engine really run?

Those engines were poor performers in the early 80's, better heads, more compression are called for here, but a performance built 383 stroker will still run it off the road, basically any 305 would have trouble standing up against a decent 350.

[jveik]

yeah you can put a decent cam in there and some better heads and maybe get a decent peak horsepower of over 300 horsepower, but theres no way in hell you can get a torque curve even close to a 350 or the 383 for that matter. i bet it will get good gas mileage though... i would look into the performer package from edelbrock, but thats prolly pretty expensive...

you should have got a 350 and had it turned into a 383, then you could make 500 lb/ft of torque and a decent 450 horsepower pretty easy without needing really high rpms to get it...

[dmbrisket 51]

first if you want a 383 de-stroke a 400, much much better choice of $$'s spent... for a 305, depends on how wild you wanna be, dome/flat top pistons, wild cam, smaller heads, deck the block, mill the heads and intake, port n' polish, atleast a gasket match cut, full roller rockers at a 1.6 ratio, preformer intake, 2 middle of the road (cfm wise) carbs, stall converter, you can make a 305 a fairly decent moter, but as said thers not as much potential as a 350 or 400 small block

[wrightz28]

Originally Posted by cwyates4

I just purchased a 1983 crossfire 305 shortblock with a few extras. Does anyone have any good ideas to make this engine really run?

I hope you didn't pay alot for it

305's are capable of decent power and can keep pace with a stock 350 after some work, but for the same amount of money and work, a 350 would make more sense.

Unfortunatley tho, the crossfire just plain sucks

[Rebel Racing 3]

You could make it a 359 stroker!!!!

[jveik]

yeah i heard that it takes .060 over to make a 400 into a 383 with the 3.48inch stroke crank. are there still cores out there capable of being bored that much over? my 383 is the more typical 350 bored .030 over with the 400 crank of 3.75 inch stroke. is the difference that the 400 based one revs much higher while the 350 based one makes more lowend torque?

as for the 305, with the right work, it will spank any stock 302 mustang from the 80's

[Rebel Racing 3]

If you build a 305 right and make it a stroker engine then it will do very well, i have the plans and have built a few sprint engines out of 305's if you need help let me know

[jveik]

lol or make a 283 that wraps out at 10,000 rpm!!!

[Rebel Racing 3]

If you take a 400 block and put in a 350 crank you have a 377, if you take a 350 and put in 400 crank you have a 383, if you take a 305 and put in a 400 crank you have a 359

[silicon212]

Originally Posted by Rebel Racing 3

If you take a 400 block and put in a 350 crank you have a 377, if you take a 350 and put in 400 crank you have a 383, if you take a 305 and put in a 400 crank you have a 359

If you put a 400 crank in a standard bore 350, you have a 377. .030 overbore takes it to 383. A 400 crank into a 305 standard bore block yields 328 cubic inches. A .030 overbore yields 334 cubic inches. A 350 crank into a 400 standard bore block gives 372 cubic inches. A .030 overbore yields 377 cubic inches.

I don't know where you got your numbers from!

Standard 305 bore is 3.736 inches. .030 is 3.766 inches.
Standard 350 bore is 4.000 inches. .030 is 4.030 inches.
Standard 400 bore is 4.125 inches. .030 is 4.155 inches.

Standard 305/350 stroke is 3.480 inches.
Standard 400 stroke is 3.75 inches.

The formula for CID is pi/4*bore^2*stroke*# cyl. pi/4=0.7843982

On the 305 stroker, we get:

.7843982*(3.736*3.736)*3.75*8 = 328.45~ rounded to 328
.7843982*(3.766*3.766)*3.75*8 = 333.75~ rounded to 334

Try it!

[Rebel Racing 3]

Ok well i have been racing in the dirt track world for over 10 years, my engine builder has been building for me for that time frame but has also been building racing engines since like 1958 he is 63 now and he said a 350 block 400 crank=383 he said a 350 block bored 60 with 400 crank=388 he said 400 block std bore and 350 crank is 377 and a 305 block bored 60=359 with 400 crank

[Rebel Racing 3]

and from a chevy smallblock book and i quote "The 377 cubic motor is built using a 400-style block and a 350 medium journal crank depending on the size of the 400 block cylinder bores, you get the large bore size of the 400 with the higher RPM capabillties of the shorter 3.48 stroke of the 350 crank.
Another common non-factory combination to build if the 383 but it has different power generation and rpm operating range characteristics. For the 383 you use a 400 crank in a 350 block."

[Rebel Racing 3]

and for the 359. 305 block, 400 crank bored to 307+30=359 cut 150 thousands off the top of the deck of the pistons, cut off the skirt of the pistons use 400 rods, fill the block half full of block epoxy to stregthen the walls of the cylinder and my engine builder said that is how he made a 359 out of a 305

[silicon212]

Originally Posted by Rebel Racing 3

and for the 359. 305 block, 400 crank bored to 307+30=359 cut 150 thousands off the top of the deck of the pistons, cut off the skirt of the pistons use 400 rods, fill the block half full of block epoxy to stregthen the walls of the cylinder and my engine builder said that is how he made a 359 out of a 305

I still don't know where you get 359. I gave you the hard numbers - math doesn't lie. Cutting the deck down does not begat cubic inches - it increases compression ratio. Cutting down the piston crowns lowers compression ratio. Epoxy strengthens the block, it doesn't add CID. Cutting the piston skirts provides clearance for the crank. By overboring to 307 ... even with that number plugged in it still doesn't provide 359 CID (if you're talking boring out to what a stock 307 was - 3.875" bore).

It does provide 353 and if you bore it another .030 it might be 359 - but I wouldn't expect that to live on the street. Once again, it comes down to thickness of bore and a 305 doesn't have thick bores to begin with.

The mod you're talking about is essentially stroking a 307, not a 305. It is what it is - and if you go around throwing credentials about how long you've been doing this, I was building competition small blocks in the late 1980s.