piston and head gasket advice

franks70camaro

Veteran Member
Jul 6, 2009
907
fayetteville nc
ok i posted b4 n got thoughts on head gaskets the felpro 1094 was sugested heres what i have for a motor i have procomp heads n for some reason there recomending using the felpro 1003 will this b right wit the quench for my set up ???
383 stroker flat top hyperutectic 4 valve relief 30 over pistons part number h345np
comp cams xe 270 roller cam
my heads are procomp 210 runner 64 cc heads
running a eddy rpm airgap intake
1.6 roller rockers
so my question is can any one tell me the head gasket i should b using wit this set as i need to buy my gaskets monday n wanna get it right . i see all this talk about getting quench right n see the number 040 around alot im new to this so i need help all advice would b appreciated
also wondering if my cam is a lil small for what i have n if so what would u guys recomend in a bigger roller cam from comp cam
 
Last edited:

Dogwater

Veteran Member
Dec 23, 2010
926
SanAntonio Tx
U should know or u need 2 know these things.
How much was my engine block decked.
How far down in the cylinder R my pistons.
Because U might having 2 burn 93 octane all the time, or if you'll be using a lot of bottles of "Ping Be Gone".
What's the compressed thickness of each head gasket?
 

73 Z

Veteran Member
Jun 9, 2007
1,284
Los Angeles, Ca
If all parts are exact tolerances as described.

Then a stock sbc is 9.025

383 Crank is 1.875
5.7 Rod is 5.7
h345np piston +1.425 or 1.560 compressed height
= 9.000 or 9.135 ^
Un decked sbc - 9.025 ^
= 0.025 = 0.11 out of the hole
1094 gasket + 0.015
= 0.040 Quench
 

franks70camaro

Veteran Member
Jul 6, 2009
907
fayetteville nc
73z so what would the differance in a felpro 1003 b and the 1094 i was looking onlne n wit the procomp heads i have they recomend the 1003 head gasket but i always hear u want 40 quench if i use the 1003 i woent have that correct
 

73 Z

Veteran Member
Jun 9, 2007
1,284
Los Angeles, Ca
Or crank 1.875+rods 5.7+pistons 1.425= 9.000
stock sbc 9.025 + 0.015 (1094 gasket) = 9.040
good quench is around 0.036 to 0.041
 

73 Z

Veteran Member
Jun 9, 2007
1,284
Los Angeles, Ca
1003 is .041 compressed height
1094 is .015 compressed height

there are other gasket thicknesses available

So if I had a zero deck block at 9.000 and a 383 crank with 5.7 rod and 1.425 compressed piston height I'd use a .039 compressed gasket to achieve .039 Quench.
 

hhott71

R.I.P 11/19/18
Lifetime Gold Member
Mar 30, 2001
14,377
Joplin Mo. 64801
You have an undecked block, as you stated, correct.
That means your deck height is 0.025"
Add the 0.015" thick Felpro #1094 gasket and you are 0.040" of Quench.

Use the Felpro #1094


The 1003 is TOO thick at 0.041" + 0.025" = 0.066" = Ping Ping Ping
 

Dogwater

Veteran Member
Dec 23, 2010
926
SanAntonio Tx
If standing in front of the car there's a small pad that's part of the engine block, its on the left side, front of the engine, just below the left cylinder head, is there still numbers an letters stamped on it? If there still there the block hasn't been decked, if its blank or no stamped numbers then it has been decked. But either way I'd use the 1094 head gasket. Also those gaskets might say " this side up".
 




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