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According to this calculator it should increase it from 9.4:1 to 10.09:1.

As far as the block goes just check it with a straight edge and feeller gauges.Great thanks, then this job is going to be about as easy as I expected it to be.That is such a small gain it wont really be noticeable, trust me.But no you dont have to deck the block too, just assure its straight (which it usually is).I changed that much compression in one of my old Fiats just because I couldn't find the thin gasket I had. The typical total cost for an automatic transmission car runs between $2500 and $2700. Joined Apr 26, …

Aug 15, 2011 #4. What head height should i ask for from the machine shop ? We are building a 99 engine for fun mid pack use . By using our Services or clicking I agree, you agree to our use of cookies. Low power light cars make you feel the difference. Depending on the year and engine configuration of your 2.5 Subaru, the base head gasket job for parts (including tax and labor) costs between $1600 and $1700.

yes , i did read all 30 something pages Thanks ! I'd like to shave .030" off of my Miata's cylinder head for some more compression. This process is done at many machine shops and can cost a good deal of money. Chuck Taylor NASA RM 12.1.9. 89 0. I'm really not wanting to port it or do machine work to both the head and cylinder due to the cost. Milling 0.125"-plus is not unusual, but this is usually only done where a race track/series has rules regarding what cylinder heads can be used.

your sending your head in to get redone without even knowing the cost? I totally felt the difference, specially in low end.

I only say a lot of work because it's also a Miata. Did enough to get it to a point where it handles the way I want it to, so I wanted to try some stuff with the engine. I'd like to shave .030" off of my Miata's cylinder head for some more compression. Has the cyl head ever been re surfaced before also. I've already read enough to know, that I won't run into any clearance issues with this much … I would understand if it was a race/drag car that was maxed out on performance and this was a last ditch effort to increase horsepower as possible but it's not a race car, it's a Miata trying to make 115hp.Some time ago I would've agreed with you, but this has kind of become my little project for the past 2 years. The minimum heights of the cylinder heads as measured in the factory service manual allowed are shown in the following table.Jim, I understand and will have the machine shop check . When you shave the head and only clean the surface of the block a little and reassemble it with a new gasket, will it seal properly or does the block need to be decked too?

My assumptions in this discussion is that the head, while varying somewhat in tolerance from the factory, still is in a reasonable range of values, and therefore since all 94 bottom ends were somewhere around .2 low on compression, I can calculate a conservative estimate on how much to shave and be legal in 99% of engines/heads. I have tried it with no base gasket, which resulted in a squish of .051" I'm shooting for a squish of .040", but not if it's going to get the compression high enough to require race gas. I've heard of cases where people shaved up to .055" without any valve clearance issues. When the head is disassembled, lay a cam back in its position and push down on either side...odds are it will rock over the center. I didn't have any issues with the head gasket prior to this and I'm not aware of the head being warped at all.

how much if any should I shave the head ? Thanks for the replies. I really can't see myself spending that kind of money on this car right now.New comments cannot be posted and votes cannot be castPress J to jump to the feed. Cylinder Head: The gasket face of the cylinder head may be resurfaced provided the maximum compression ratio is not exceeded and the minimum height of the cylinder heads are maintained. I just want to be sure.Additional question: I've seen some videos of cylinder heads being shaved and some of them actually weren't disassembled at all with the valves still in place. What head height should i ask for from the machine shop ?Engine was overheated so a small shave might be needed.12.1.9. Maybe id only gain .1 compression, maybe it would be … (This fiat is 800kg/1700lbs with a full tank)Are there any thinner head gaskets instead?

Adding the timing belt, idlers, and tensioners, seals and water pump adds about $700. Several functions may not work. Porting and polishing your cylinder heads will give your engine more horsepower and make it run more smoothly while increasing fuel efficiency. Engine was overheated so a small shave might be needed.

I just like to change bits and pieces along the way and like to see the difference it makes. This is often "open chamber" SBC heads as was used in the smog years, the idea being the costs associated with engine building will be less using these commonly available heads. According to My concern is about the block. any machine shop should be able to give you a price quote for parts, labor, and machining before they even touch your stuff. They run boosted over 300hp at the crank and over 8000rpm with an upgraded valve train and harmonic balancer.Seems like a lot of work for 5hp. Maybe you can get tighter squish and higher ratio without having to shave the head.On the lookout but since going boosted is much preferred on this engine the stock gasket is already around .030", I don't think I'll be able to find anything.

Are there any dangers to that or is it okay to do?You can shave the head without removing the valves as long as the cam is removed. Unless you are going to build something all out, this should be fine.What Jim said...BOTH sides warp. price varys depending on what your getting done. - posted in Spec Miata Rules & Competition: Hello all We are building a 99 engine for fun mid pack use . I had people want cyl heads or blocks to have a certain amount taken off but after checking the factory thickness ( when possible ) many already had inconsistent amounts off them.Absolutely. Might go turbo one day, but who knows.

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