every thing ive read about the 305 is people ****ing on it for its stroke being to long for the bore size so what if you put a 327 crank into it?? im asking about a 327 crank because its one of the easyest de stroking cranks i could find (i would love to find a 302 crank)
the 327 has a stroke of 3.350 inches
305 stock bore of 3.735 inches
higher rpm would be easyer on the bottom end, and from what i have gatherd the reasion why the 305 has so much TQ is from the tpi so i wouldent think it would hurt TQ all that much. when i punched in the # i got a 294 cid (or around there) displacement or 4.8 L. if any one has any input on my idea feel free to add

 

The problem isn't that the bore is too small for the stroke, it's that the bore is too small for decent flow through the valves.

 

ok turbo/supercharger so air flow wount be a problom

 

a 327s stroke is 3.25 and small journal, except for the last few than GM made. you need a bigger bore to make more power not less stroke.

 

alls im saying is be de stroking it rasees the rpm limmit of the bottom end making you turn more rpm, more rpm+ better cam (made for more rpm)+ boost= more power or even with out boost, its just like (i know, so dont hate) the integra 1.8L b18c making somthing around 180 hp in stock trim because it has vtec witch opens the valves more at high rpm and it can turn high rpms
p.s your right about the 327 stroke, good call

 

destrokeing has nothing to do with rasing the rpm. the engines ability to move air in and out does and destroking it doesn't make it move air any better

 

The rpm limit has nothing to do with the stroke length.

If you want to build a high rpm 305, just do it.

use a big solid or roller cam, high compression, big headers, good flowing cylinder heads and a hi rpm single plane intake and a larger carb.

You can easily make a 305 that buzzes to 8500rpm and makes good power ( for a 300ci motor). Just as easily as a 302 327 350 or what ever.

Small main bearing and rod bearing journals help. (Toyota bearings)

Reducing the stroke just makes a motor smaller.

Your real rpm limit is the valvetrain and $$$$'s.

Everything you would do to the legandary 302 (except maybe maximum allowable valve size) is relevant to building a high rpm 305. Just use 1.94" intake valves instead of 2.02" and go to it.

A hi compression, hi rpm 305 that makes 430+ hp and buzzes to 8500rpm would be a blast on a limited street driven car with a very high 5000+ stall 7" or 8" competition race converter or 5speed trans, hi octane gas and very high rear gearing. Think in terms of 11.5-12.5:1 compression 260-280@.050 .550++" lift solid or roller cam
full race valvetrain.
1.75" headers, big single plane or a tunnel ram manifold and 1 or 2 750+cfm carb A blueprinted oiling system helps.

The stock stroke length will not hold it back a bit.

Valvesprings and bearings are going to be a maintanience item.

 

If you are going to spend the cash to de stroke a motor and you want a 3.25” stroke pout it in a SB 400 and make a 347 the small bore of the 305 can shroud the valves and inhibit air flow but if you’re looking for RPMs why not just get a stronger rotating assembly. Ya the 1.8 type R dose make 180 HP if you have the Japan motor the American version has 170 and if you haven’t noticed people drop it in place of the smaller 1.5 and 1.6 just like people replace the 305 with the 350 because usually bigger is better.