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Post by 383 Sonoma on Dec 7, 2018 8:23:30 GMT -5
So I have a few questions, I did read all 98 pages and didn’t find my answers. I am building a 350 to throw in a Vic I’m throwing together for a show in the spring time. I don’t want a huge powerhouse, just want it to be reliable and stay running, and restart when hot. I picked up a 355 010 block with vortec heads off craigslist. Yes they are vortec heads and not tbi heads. They’re 062. Seems to be a good base engine to start with, the guy said it was recently rebuilt which I believe him after opening it up because it is in very good shape and not a lot of wear on parts. I wanted to go through it myself to see what I have and am starting with. Somehow I lucked out and it came with a comp 268 which is what I was going to buy anyway seems to be the more recommended cam by guys on here who’s opinion I trust after reading their posts. What kind of bearings are you guys using? And what to do for clearances on the bearings? Running stock clearances or opening them up to make room for expansion? Also as far as ring gap I am sure guys are opening the clearances a bit but don’t know how much would be beneficial? Any other tips on things I am missing would be appreciated, also i know that a lot of trial and research goes into everybody’s engines and am not asking for people to get out their notebooks and spill secrets. Just looking for a push in the right direction. I’m sure I missed crucial info to help with answers, seems to happen when you’re being put on the spot lol Don’t use oil seals on your valves... make sure to weld the pick up to your oil pump... and run a roller button on the camshaft.... there’s a push towards the light at the end of the tunnel
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Post by beefybuilt104 on Dec 7, 2018 9:03:34 GMT -5
Thanks both of you. I found jokers old post
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Post by JR/77x on Jan 29, 2019 21:43:12 GMT -5
Ok, so I’ve gone over this thread about twice now, looking start working on digging out a 305 this year, seen where power pack heads were a good replacement, I have some on hand, the only thing is I’m not too excited about using that head combo... I mean being 50 y/o heads needing to be rebuilt and having the crappy valve seats and of course “but dosent really bother me” no accessory holes,,, would a lighter casting 305 head like a 416 be a better choice? Heads are currently on it are junk smog heads motor is a 78 305 Just don’t want to invest in a bunch of money on the old power packs when I have other options just looking for opinions.
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R.W.O.555
Future Icon
If I can't weld everything i'm not wasting my iron.
Posts: 117
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Post by R.W.O.555 on Jan 29, 2019 22:46:59 GMT -5
early to mid 80s 305 H.O. heads are epic. I have a early 80s 305 H.O. out of a rusty olds cutlass that was given to me and it turns on! (its impressive for a small, smogger motor anyway hahaha) 58cc combustion chamber if I remember correctly which is nice for a bit of added compression though I cannot remember the casting numbers off the top of my head right now. that motor powered my 86 k5 blazer 4X4 on 38.5 x 14.50 super swamper SX with 456 gears for a couple good years and is now on the list to get pulled, a mild cam added and it's goin into my demo car between a dp and cradle (I have a 10 to 1 comp 357sbc for the bogger now)
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Post by smashford on Jan 29, 2019 23:29:13 GMT -5
I had a ho 305 roller cam I put in my 90 chev 1500, couldn't believe the power that thing made! Better than even any tbi350 i ever drove, maybe even as good as a vortec 350!
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Post by JR/77x on Jan 30, 2019 6:27:29 GMT -5
Yeah same put a 305 in and 89 pickup was a 350, 350 spun rods it had 1/4 of the mileage of the 305 I put it it lol, motor was a tank truck still runs to this day I still see the old guy I sold it to driving it around.
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Post by beefybuilt104 on Mar 4, 2019 18:27:17 GMT -5
Do you need to use a cam button for a normal hydraulic flat rapper style cam?everything I have been reading says you only need a cam button if you go with a roller style cam. Thank you in advance.
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Post by JR/77x on Mar 4, 2019 19:14:20 GMT -5
Do you need to use a cam button for a normal hydraulic flat rapper style cam?everything I have been reading says you only need a cam button if you go with a roller style cam. Thank you in advance. Correct, On a flat tappet cam, the lobes are ground with a slight angle so that the valvetrain pressure on the lifter restrains the camshaft to the rear of the motor. but on a roller cam and lifter, the surfaces are ground flat and the lifter no longer puts pressure on the cam to restrain it, therefore a cam button on the gear end of the cam is used to take up clearance between the cam and timing cover to keep it centered. thats about the best i can explain it.
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Post by beefybuilt104 on Mar 4, 2019 19:19:47 GMT -5
Do you need to use a cam button for a normal hydraulic flat rapper style cam?everything I have been reading says you only need a cam button if you go with a roller style cam. Thank you in advance. Correct, On a flat tappet cam, the lobes are ground with a slight angle so that the valvetrain pressure on the lifter restrains the camshaft to the rear of the motor. but on a roller cam and lifter, the surfaces are ground flat and the lifter no longer puts pressure on the cam to restrain it, therefore a cam button on the gear end of the cam is used to take up clearance between the cam and timing cover to keep it centered. thats about the best i can explain it. Thank you. That is what I thought but just wanted to double check and make sure. Much appreciated.
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owen11x
Feature Winner
Ford makes it, Chevy shakes it, Mopar breaks it!
Posts: 2,585
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Post by owen11x on Mar 4, 2019 20:46:38 GMT -5
Agreed on above comments. 86 monteCarlo 305h.o mild cam h.o heads of course with very minor diy porting and roller rockers. .030 over that motor won me more money over 5 years than I spent on the sport Ran so good I never changed a thing on it except oil and plugs every run. Punisher 400 and 4.56 gears. Sold it when I bought my house for remodeling. Wish I still had it was my favorite gm engine
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Post by 383 Sonoma on Mar 6, 2019 15:19:26 GMT -5
Do you need to use a cam button for a normal hydraulic flat rapper style cam?everything I have been reading says you only need a cam button if you go with a roller style cam. Thank you in advance. If you’re derbying this engine then yes you should use a roller button.
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Post by smashford on Mar 6, 2019 22:53:17 GMT -5
Your saying a roller button for a hydraulic lifter motor in derby application?
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Post by 383 Sonoma on Mar 9, 2019 8:33:30 GMT -5
Yup
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Post by boilermaker on May 14, 2019 10:35:53 GMT -5
So whats the common thoughts about 400 SBC.
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Post by cheezwhiz31 on May 14, 2019 10:42:45 GMT -5
good torque engine. Not great with heat. Head gaskets between siamese cylinders is super thin. Have seen them work but wouldn't try for a 30 min plus heats/features...
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