Hello Everyone,
I just dropped off my 402BB at the machine shop yesterday. I need some help
with picking heads. I have a pair of closed chamber 100.9 cc heads and I have a pair of 124 or 122 cc 049's. I don't want to install bigger valves in the 049 heads. But could have them decked to reduce the CC's. Which should I use? this is not for racing or anything. Thinking about a performace cam nothing too high a lift .560 tops. Any Ideas? I ask this so I can buy Pistons.

Thanks

Stick with the closed chamber heads and a .180 dome piston.
JMHO and experience.

You'll have to take 8cc off those 049s to get into a good 10:1-10.5:1 static ratio(115-117cc) with ALOT more dome, therefore....what he said..... :)

Mr Speed, I am also building a 402 using a set of 290 casting heads which are 101 cc's so I am told. I was shooting for a 10:1 c.r. and was wondering what brand of piston is that you recommended? Iam considering using one of the speed pro kits which comes with the pistons, rings, oil pump, gaskets, etc.

Also I'm most likely going to go .030 and make it a 408.

I am looking at TRW L2240 pistons. they have a dome of .182 and a CR of 9:71 with 100.9 CC heads

Where do you get those? Are they forged or cast or hypers? And do they make overbore sizes? I'll probably end up with a 408 when it's all said and done.

The correct '70 spec 402 piston is L2354. Approx .18 dome @ 19.8CC. This will yield right around 10/1 with 101 chamber and .040 quench. My 408 finished out at .014 deck, .041 gasket and 104CC head for 9.5/1 CR. I originally intended to use the .022 shims wound up using the Felpro instead.

If any of you 402 guys need to get a crank or bore the motor, consider using a 4" 454 crank with the KB 361 piston 402 +.030 = 434 CI, 402 + .060 = 440 CI. Considering how beat up the 454 blocks seem to be, 440 CI is not that far off.

http://www.summitracing.com/

RW-L2240NF60

$33.95
Estimated Ship Date: Tomorrow
Overview
Brand: Sealed Power
Product Line: Speed-Pro Power Forged Pistons
Bore (in): 4.154
Piston Material: Forged aluminum
Piston Style: Dome
Compression Distance (in): 1.760
Dome Height (in): 0.182
Dome Volume (cc): 21.00
Valve Reliefs: Single
Wrist Pin Style: Press fit
Pin Diameter (in): 0.9890
Top Ring Thickness: 5/64 in.
Second Ring Thickness: 5/64 in.
Oil Ring Thickness: 3/16 in.
Quantity: Sold individually.
Notes: Approximate compression ratios with dome: 9.71:1 with 100.9cc, 9.20:1 with 106.9cc, 9.00:1 with 109.4cc, 8.47:1 with 116.9cc, 8.33:1 with 119cc, and 8.02:1 with 124cc head.


Just change the last two digits for the over bore .060 is (NF60)

The correct '70 spec 402 piston is L2354. Approx .18 dome @ 19.8CC. This will yield right around 10/1 with 101 chamber and .040 quench. My 408 finished out at .014 deck, .041 gasket and 104CC head for 9.5/1 CR. I originally intended to use the .022 shims wound up using the Felpro instead.


Hhhmm...where do you get that piston at? And what heads was that used with?

I looked at some of the forged aluminum pistons...I see they make one that looks like it will have like an 11:1 c.r. when used with a 290 head...summit p/n is TRW-L2328F30. While it sounds good I'm wondering if there will be enough valve to piston clearance if used with the standard 3.76 inch stroke? And who makes a street/strip cam for this? And is it compatible on 93 unleaded?

You asking about the L2354?? correct??. You can read the info on www.federal-mogul.com, this is the same piston I have in my 408 motor. The 396 .060 piston will work also, just keep in mind that it is actually .001 undesize for a .030 over 402 motor 4.155 vs 4.154. If the block is getting bored, defintely want to have the pistons first. I had seen the L2354-.030 listed in Summit before. You may have to call them, I was doing some browsing through the revised site and don't think they relisted/transferred everything over. I know the L2354-030 is correct, I have these in my motor now.

I'm stillnot seeing what I need to know.I think I will just look more at the Speed pro 396 .060 pistons. Seems like the one I originally listed wont work.