Anyone know how far you can mill the head surface on a buick 350 without changing the pushrod length? Currently running 256/262 lunati voodoo cam in a 72 buick 350 with stock pistons lift is 472/480 intake and exhaust.
.020-.030. You really need to check for pushrod length with new cam anyways. Some are ground on different base circle then factory. Get cam break in lube . Have heard these cams not lasting long. You will need new valve springs with that cam or you will bend pushrods in upper rpm.
I'm going to swap out rocker assemblys and get new pushrods and have the heads milled for compression was my reason for asking it has been fine so far but my rockers are worn slap out
Mill the crap out them, change front cam bearing, get adjustable pushrods. Bam. Go run it. Get a distributer recurve kit and bring the timing in quickly. 2500 convertor would be nice addition If you can get 46 cc chambers that’s an actual 9.1 compression
I'm running ta hei distbutor ported heads and ported exhaust manifolds with the ta sp3 intake lunati cam and lifters as stated before so really thinking the compression is definitely the weak link
Cam is abit small for a single plane in theory. Would like to see how it turns out. I would suggest a Holley 750 mechanical secondary and an air fuel meter.
I'm running on the new quick fuel brawler street 750 with mechanical secondarys haven't tuned it yet but so far I've been really impressed with it out of the box it's a lot of carburator for the dollar.As for the single plane intake I rather spend the money once than have to buy it later on when I go forced induction.
Think im shave 0.035 off the heads that should put me above 9:1 and then just check my pushrod length and lifter preload when get them back then order the right length pushrods.
You can use steel shim gaskets which are only .020 compressed. They say it's worth roughly just under 1/2 point compression bump....
I think your gonna be disappointed at .035 off. No it won’t put you at 9 to 1. When you get your heads off, measure piston at top dead center. My 71 measures .058 below deck. 24 cc piston dish. 58 cc head. 3.8 bore/3.85 stroke. Nets about 8.2 factory with about.040 thick gasket. So you need about 48 cc head for 9 to 1. That’s 10 cc off head. I have heard estimates of 3.2-3.5 cc for .020 off head. If that’s close , you will have about 8.7 with .035 off. Mill heads .060 and be done. Most Shops charge per .020 off anyways.
there's over .100 of movement in the lifter cup. Don't worry about it. You're not netting much of a change anyway. The factory head gasket was .020 vs the .040 replacements.
They were for the '71 cars that were made in '70, well that's what Mart told me anyway about the original head gaskets on his '71 GS350 car.
I believe mine has it I'm not around my motor right now so I can't see if it dose but I think it has that passage I called ta and Tim said that for every 0.005you mill you gain gain - 1cc on the head.
Am looking at getting ta heads when the put them up for sale so this is just a temporary thing also let me looking at forged pistons when I swap new heads want to run nitrous or Turbo on it in the future as it is a street strip car.
