I've been thinking about putting a Crank out of a 400 Small Block into my 305. What is it going to take to do this and how much of a power increase am I going to see? How much time would installing the crank take? Also how much would this cost me? I've looked at Stroker Kits from PAW before I just don't remember how much they wanted for them. Anyways thanks guys........

 

For the money, I'd consider intake, head and exhaust mods first. If you ahve all of those then the stroker is an option. I'd only spend the money on a stroker if you have emission testing and can't change blocks. Though, the TBI is not known to handle "big horsepower", it should run a mild 350. If you have to do the stroker, figure you'll be lucky to see 1 hp per cubic inch (but you may gain 30+ ft lbs of torque, maybe more if you are lucky). It is not the winner in the bang for the buck category, but it is possible and functional. If you have a TBI car, remember a stock 400 crank will be for a 2 piece rear main seal block and you may need to get creative or use a crank for a 1 piece seal (I thought SCAT made one, but I've not looked in years). You will need to have it balanced in most cases and that will add a few hundred ($200?) to the cost.

Good luck!

 

Scat does makes a crank with a 1 peice seal, so does Eagle. You will also have to have the block clearanced for the bigger crank. It is not just a drop in and go thing. So that will add more money and time. Personally, if you don't already have them done, I would do a heads/cam/intake mod first. But if you have those done, or are planning to do them at the same time then I say go for it.

 

Well i used to have an 87 Z-28 with a 335 stroker but it was TPI car was a complete pile of **** but it was faster then my 87 GTA but my 91 GTA walked all over it.....

91GTA ran 14.80's with 350TBI and 3.73 gear's.190,000miles.

87 Z-28 ran 15.40's with 335TPI and 3.08 gear's.86,000miles.

87 GTA ran 16.10's with 350TPI and 3.23 gear's.120,000miles.

If your going 335TBI i'd use the holley comander950 700cfm 4bbl TBI . But if stockish was the plan i'd get the TBI unit and fuel pressure regulater from a 350TBI or 454 TBI truck......

a Most is definatly 3.73 gear's 3.42's are ok a little too high and 4.11's are a bit to low..but iether will work..

but 3.73's would be i deal.

................

Well it's your car man do what you must.
Most important have fun and be cool

 

not worth it. Buy a 350 block, put the 400 crank in that and have a 383.

THe rods will swap over, as will most of the accessories.

 

i agree

 

A 383 sounds alot better than a 335 just might have to do that. After I do the intake, heads, and other mods first i'm just thinking of things and getting opinions for now thanks guys.

 

You can't put a 400 crank in a 305, unless you upgrade the rods. You're assuming because you can drop in the 400 crank into a 350 you can do the same to a 305. This is not true. The 350 and 400 share the same journal sizes. The 305, although it has the same stroke as the 350, has a different journal size. So if you want to stroke the 305, you'll need a COMPLETELY custom rotating assembly. That means a custom (not 400) crank, custom rods and pistons. I've heard that you can cut the journals down to the 305 spec, but I've never seen that and can't imagine anyone would want to cut down a crank journal that far.

IMO - don't waste your money or time. Unless you're **** retentive about sticking with the 305 block, don't care about costs, and aren't worried about performance, don't do the 305 stroker thing. It's a nice idea, but in the end you WILL be disappointed. I'll probably get flamed by some 305 believers by this, but they should be used to it by now.

 

350 and 305 use a 2.45" journal diameter. 400 uses a 2.65" journal diameter (main journals). You have to cut the 400 crank down .20 for either one. A 383 crank will drop into a 305 block (and still have the same clearancing issues as a 350) just as easily as a 350 block. It just isn't really worth putting it in a 305 unless emmisions testing requires you to have a block with a 305 casting number on it.

Rod journals on all 3 motors are the same size (excepting for very early stuff, 1967 was the only different year (as I remember) and it was smaller (I'd have to look that up before I swear to exactly which years were affected, I'm sure someone will drop in with the "small journal" years).

To save any possible arguements, here is a list of bearings for Small Block Chevy's.

http://www.jegs.com/cgi-bin/ncommerc...45&prmenbr=361

You'll notice that the only bearings listed as "different" are the 400 main bearings. All the rod bearings are the same (again, except the late 1960's small journal stuff) as are all the main beaings (except 400).

Have fun!

 

i agree with the above posts. forget the 335 and get the 350 block. do it right with a carb, forget the lousy TBI