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Old 08-10-2013, 01:17 PM
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l69 305 ho ?'s

I have a 85' L69 305 ho, freshly stock rebuild I took it out of a transfer am, and I set it in my 1985 Chevy silverado 4x4, tossed the 700r4 and stock transfer case, and put in a 84' granny 4 speed with the matching transfer case, currently the silverado maintains the stock gear ratio of 3.08's, ok it runs good for just a 305ho but I was thinking aluminum high rise intake (edelbrock performer Rpm Q-jet) to maintain the use of my q-jet and have good runners, and the second thing I have a edelbrock performer plus can, (278/288adv, 204/214@.50,420"/442") will this can be great for this
motor and being and 4x4 too??

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Old 08-10-2013, 02:42 PM
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talk to fbird88 for decent 305 build up knowledge.He really seems to like 305s
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Old 08-10-2013, 04:12 PM
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I don't so much "like" 305's but do know know to tweek them to make them decent.
If you are hell bent on building a 305, having a fresh rebuilt 305HO L69 motor is a good start.
One thing you got to realize with a 300 CID motor 302-305 283 etc is they need to rev up to make power.
So a 3.08 gear in a truck is going to be a dud. Especially when you hot rod the 305 engine.

The #4416 305HP heads need porting. Be very generous with the porting. More is better. port to a 1205 gasket.
The meat and potatoes is deep in the ports. adding a 1.94" intake valve helps too.
Don't expect power and performance until and unless you fully port the HO 305 heads.

Any cam change needs compression. The true measured compression ratio matters.
You want 10:1 10.50:1cr . You want the L69 flat top 1.56" pin height pistons. ya it matters.
CC the finished heads... Shave the ported heads and use a thin .015" gasket as required.
on a flat top 305 be thinking 54cc to 58cc w/thin .015" shim gasket.

Moderate hyd cam -- Moderate solid flat tappet cam with 1.6in 1.5 ex rockers. Ported heads like valve lift.
There are much better cams to choose from than that one.

the RPM Qjet manifold is a good choice. add headers and 2.5" dual exhaust.

Gears gears gears. A hot rodded 305 has to rev up.
this is what a fully ported 305HO head looks like.

Last edited by F-BIRD'88; 08-10-2013 at 04:22 PM.
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Old 08-10-2013, 04:24 PM
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Another very very good direction you can go with this motor is to Supercharge it.
Low compression ratio 8.50:1 or less ...ported heads Weiand 142 blower 750cfm carb.

Weiand 177 cid blower 750++ carb. now your lil 305 will GLH. Stroker motors be ware of this one.

Last edited by F-BIRD'88; 08-10-2013 at 04:32 PM.
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Old 08-11-2013, 06:07 AM
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I looked up the specs on the l69, the site said it came with 9.5-1cr, which I personally don't wont to run more than that, the last motor I built I built it with 10.1cr, and all it wanted to drink was good old 93 octane, I wanta be able to run 87 octane without any problems but my bro said it pinged on 87 in the trans am, so that makes me wonder what kind of pistons he used or did he have some head work done (shave) but the other can I was looking at is the xe262h compcams, I have a pair of headers at my buddy's just gotta get them, yea I'm planning on changing the gears in the future..
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