My heads are overhauled with new 2.02 and 1.60 valves with screw in studs. The combustion area is calculated to be 64.4 cc's. Hydrolic lifters.

The overhauled block has a 30-30 cam profile and has a zero deck . The machine shop says to use a head gasket with a compression of .35 to achieve a compression of 10.1 to 10.5.

What would be the best head gaskets to use ? Also is there a whole gasket kit that is avalible ? Thanks for the help.

 

What pistons are in it?

 

Forged TRW Flat tops with four valve relief

 

In Fel-Pro you can choose:
1094 Steel Shim just like factory .015 thick
7733PT2 Standard Head Gasket .039 thick
501SD Super Duty .041 thick, much tougher than stock but not quite a race gasket

The 501SD resists detonation damage 3 x better than the standard 7733 PT2 for very little increase in cost. On our HP 327 engines it is a very good upgrade.
Most shops don't carry them but can order them in usually within one day.

Several Race gaskets are available for the small block GM depending on your heads and power level. 1003, 1004 and many more specific to certain heads and bores.

MLS Multi Layer Steel Designs
1142-026 MLS Gasket .026 thick
1142 .041 thick MLS Design

The MLS head gaskets are identical in construction to what is used on todays new Vette engines, these can hold more power than any gasket ever made for production use.
Tested at Bonnyville in a Twin Turbo Small block making 2200 HP, used in Nascar etc.
They are great, just expensive. MLS will run probably 65.00 per side, blind guess but close I think. You can get a whole gasket set for less than that but if you want the best these are the best. Note: the head and block deck must be smooth to run these, less than 60 RA, if you don't know what that is check with your machine shop. A rough surface is about the only thing that kills an MLS design.

 

Will these give me the 11:1 ratio of stock ?

1094 Steel Shim just like factory .015 thick
7733PT2 Standard Head Gasket .039 thick

 

i for one would not use the .015 shim gaskets with zero deck....bwtfdik??....

 

If you have zero deck do not use a steel shim head gasket. You neen .035 piston to head clerance with steel connecting rods . Use the .039 thick gaskets.

 

Spoke with my machinist,
I'm going with Summit Rockers SUM-G6800.
Q7733PT2 Fel-Pro head gaskets.039
and Comp Cams Magnum 7372-16 push rods.

 

Mr Gasket 5800G has a compressed thickness of 0.038", and is my choice. MLS is overkill for this build and a conventional composite is excellent.
There is NO WAY that you'll ever achieve 11.0:1 SCR with those pistons unless you angle mill the heads for a chamber volume of 59cc (assuming the valve relief volume is plus 1 cc) for a SCR of 10.95:1.

 

He started with the 1.94 heads... and did a five angle valve job and port matched the intake and exhaust side of the heads.
Thanks for telling me about the Mr Gasket 5800G. 0.038 .
I guess the closer I get to 0.035 the better. My machinist specked 0.035 compression but I'm a newbie at this and only want to do this once

 

Those pistons are +5.4ccs
If you have a zero deck, use a head gasket with .035 thickness with a 4.01 bore hole size, the block is bored 4.030(im assuming this), and your cylinder heads are 64.4ccs, then your compression ratio will be

9.78:1 by my calculations.

Im not a cam expert, but with under 10:1 compression, maybe you should use something with less duration.

 

Are you sure? I don't find any specs for Speed Pro/Federal Mogul pistons. They have crappy online cataloging. I know from experience that their L2166NF-30 has a dome volume of 5.3 cc I thought the flat tops were closer to zero.

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To the OP: since you already have your heads setup/port matched, etc, then you have 2 choices.

1. Use a domed piston
2. Use a milder cam

Use your setup with lowered compression and leave torque and horsepower on the table. It sounds to me that you're the type that won't settle for less, however.

By far, the best choice is to make your chambers smaller and stay with the flat tops. Faster flame propagation, more power, less flame front obstruction, and less spark advance required. "Compact" chambers combined with tight quench is an unbeatable combination.

I wouldn't advise going less than .032" piston to head clearance. I don't know of any composite gaskets whose compressed thickness is between .032 and .038.

 

i agree about the cam issue, under 10-1 the 30-30 is a real bear at low speeds, however i don't think the op stated his cu. in.....if a 327, he could be in for trouble, if a 350, i have done several with flat tops and the 30-30 with no side issues and they run very well.....jmo.....

 

you cant get any where near 11-1 with a flat top piston.......more like the 270 HP with about 9.5-1 and using a 30-30 cam

 

I B Positive. I have them in one of my cars. I am using AFR heads with 65cc chambers, my deck is not zero though, but it has been milled, and i am using a .039 gasket with a 4.01 bore and my compression is 9.4:1.

http://www.summitracing.com/parts/SLP-L2165F30/

Im not real sure how his engine builder came up with those numbers, unless he was calculating in for the pistons having a negative 5.4cc effect instead of a positive 5.4cc and fudged some other variables.

Why does your block have a zero deck?

 

Looking at the info,heres what I have
Deck -.003
bore 4.030
stroke 3.250
CID 331.6
Pistons TRW 4 valve reliefs piston to cyl wall .0032

Cam Elgin Prostock E1011P

Cam Lift
Int .325 Exh .325

Valve lift
Int .488. Exh .488

Lobe centers
Int 106 Exh 110

Adv Dur
Int.292 Exh 300

.050 Dur
232int 234 Exh

Adv.timing
BTC-39 ABC-73 BBC-79 ATC-41

.050 Timing
BTC-10 ABC-42 BBC-47 ATC-7

 

That cam looks way to big for a 9.4:1 motor. I'd be looking for something like the L79 cam at 222/222 duration.

 

I'll be damned!!!!!!
You are correctamundo! I went to a different Summit page earlier, and those pistons didn't show the relief volume.
Thank you.
Calculated SCR with his heads, decks and pistons using .038 gasket is 9.69:1.

 

Not a 30-30 cam, and although the intake valve closes (@ J604D) at 73 ABDC, this gives you a 2.316" dynamic stroke and 7.196:1 DCR. You should always be looking for between 8.0:1 and 8.5:1 DCR.

As a comparison, the 30-30 cam's intake valve closes (@ J604D) at 85 ABDC, for a 2.001" dynamic stroke. This would have yielded a 6.354:1 DCR.

If you don't boost your static ratio by angle milling or domed pistons, then I recommend a modern hydraulic ("off the shelf" solid rollers for this application do not exist) roller cam with very fast flanks, whose J604D intake closing point is between 50 ABDC and 60 ABDC. Vintage clones, or other cams with slow ramps will not cut it with such low compression if you'd like a cam of longer duration.

A cam such as Comp's XR252HR is in line with your engine specs.

The following link will give you some food for thought:
http://img.photobucket.com/albums/v2...cccccccccc.jpg

 

I recommend you put any STOCK Chevy performance grind camshaft in it, use the thick head gasket to get your deck cleareance, DON"T angle mill the heads and forget about it. Forget all this hot rod harry stuff!

You're asking for trouble with sealing intake manifold gaskets and other problems for what gain?

If you're dazzled by the BS in this threa to spend the money, go for it!