A 1971 350 has 8.5:1 compression if that. If you install a 413 cam and degree it to 4* advanced (109* ICL), the Dynamic compression will be low, 6.5:1. It won't run as strong as if the DCR was closer to 7.8:1. To get the DCR to 7.8 would require the static compression ratio to be 10.5:1. Was this engine rebuilt with higher compression?
Yes, the pistons are IIRC H522np, they're suppose to be 9.25 to 1 @ .025 in the hole. When I was getting ready to assemble the engine years ago, I measured and they were .055 in the hole, so I had the block decked .050 to arrive at .005in the hole. The heads were shaved .030 then had the intake side of the heads shaved to line up with the manifold which was port matched to the ported heads with bigger TA stainless valves. I degreed the cam, and it did end up being advanced 4 deg, and within .5 deg of the cam card specs. The engine will idle at 400 rpm dead cold if I let it, normal idle is 850 hot out of gear, and 700/750 in gear hot. In gear hot idle vacuum is around 7.5" It might be higher as my power brakes work fine.
Im letting the trans. shift, I recalibrated the governor to shift at 5300, I used to shift manually at 6000, it will pull that high. I could go in and change it. I'll definatley let yah know when I get to Thompson!
Im gonna do it!:TU: Stock was like 4800 rpm, when I had a TA 310 cam in it I used to take to 6 grand, I was like "WOW" this thing still pulls! Then I went to the 413 cam, took it to 6 grand a few times and figured "runs good, kinda like the 310" THEN for some reason, I decided to re-calibrate the governor to let the trans shift, and its at 52/5300 now, and I kinda forgot about it still pulls to 6 plus grandou: Theres sooooo much to consider running the 1/4 mile, but Im learning!
There's a lot of poer to be had in a stock 350. Mine when my Dad first got the car we did a budget rebuild on it. Rering and bearing job. It had a wiped cam so it got replaced with some type of comp RV/towing cam. Stock 70 skylark with 2.73 gears stock turbo 350 and converter. We had an electric water pump drive and a 500 holley 2bbl with a homade adapter. Ran a 15.05 at 89. Later in that motors life I found a 4bbl cast intake. 600 holley vac secondary. We put slicks on a small 3000stall and 3.55 gears. Still shifting in drive went 13.90's at i think 92 or 94 mph. We ran the crap out of that little motor. Drove to the track for years and back home. I built another one year and it blew up so put that one back in with a 650 DP carb, new th350 with a 3800 stall rev manual VB 12bolt with 410's and it went a best of 13.03 at 101. This all took place over many years. My dad got the car when I was about 10 or 11. I raced it with the same motor when I turned 16 until I was about 18 and started building better and faster. All of that was 1 rebuild, never had it apart other than the intake change. Oh and that was a 2bbl motor with no compression, it loved timing, we ran 40- 42 total all the time. Mostly 40 I remember. I'm now 32 married, got kids and still race the same car. Its SBC powerd now and runs 10.70's mostly but of all the motors I had that mainly stock 350 Buick probably won me more money than any. Dad won many times in footbrake running 15's and I won in street many, many times and later the same motor won in footbrake for me many times also. Cant say enough about those little motors.
I think Alec is on too something, Im going to shift at 6000 and let 'er rip:Brow: Im not letting the cam "do its thing" No track this Friday, rain
They have a lot of potential! Im hoping to see how much potential mine has, Im surprised how many people with 350 Buicks don't run 'em like Fox's Den was saying. Im kinda mad at myself for not running it sooner Only 2 runs so far, hoping to get a few more before the snow flies!
Finally got someone to go race and have some fun! LOL You just can't do on the street what you can do at the track. Plus on test and tune with some racing for cash all kinds of different cars show up and the ones that you think would be fast you just wiped their butts THEN they come over and ask you if it is a 455 then you laugh and tell them "it's just a tree fity":Brow: They won't be in your lane next round.
Its definatley FUN! All week at work Im thinking, tires, fuel, timing, shift points, valve springs, single plane intake when it comes out, waht the hell is holding me back!! I wanted to go this weekend again, but NOOOOOOOOOOOOO, well I can putz in the garage, maybe next weekend at Thompson!!! In a nutshell, I do believe Alec is on to something tho, my shift points! I had an "ok" run first time out. But unknown to me (being a first timer) the track conditions worsened after the dew fell. I believe at Thompson on a Saturday I can get some decent runs in and quite a few too. Im not wiping any butts yet, but Im gonna get the TP ready LOL
You had a chance to go and you did not do it. Know the feeling, all I did was mow all the grass, get rid of leaves and cleaned the tractor before the cold sets in.
Mark, 275/60/15 DR's will work great for your combo. I agree with the others - send your Qjet to one of the carb guys this winter, and the rest of your list sounds good.
Im hoping to give it another go next weekend at Thompson, IF the weather cooperates. A buddy of mine at work has a new set of MT drag radials, in that size, mounted on (I think) drag star wheels, he has them on his 93 Firebird, He said I can try 'em, Im thinking they're the same bolt pattern as mine, maybe noto No: I found my original fuel line from the fuel pump to the Q-Jet, so Im good to go, just gotta box it up and send it away.
Mark, don't you have a roller cam in your 350 now? And thanks for the heads up on Michaels racing engines Now my delay is finding time between 2 jobs to take out engine from car as he doesn't take whole cars anymore...or just fi d used 350 to buy and drop off in a day
