mr_K Posted March 29, 2014 Share Posted March 29, 2014 (edited) Im currently forging my 4e block i have wiseco 74.5mm flat top 9.1 pistons and scat rods, what thickness headgasket will i need to use? will the engine be reliable to hold 300bhp? here is my specs list: *arp headbolts and main. *mls 1.9mm headgasket. *wiseco 74.5mm flat top pistons. *scat rods. *acl full bearing kit. *stock 4e head. Edited March 29, 2014 by mr_K Quote Link to post Share on other sites
turboloon Posted March 29, 2014 Share Posted March 29, 2014 (edited) i'm running 1.4mm hg on my forged build,and i find that a bit laggy (i also run dished pistons..)...and yes yer engine will cope with 300 bhp as long as it's built and maintained correctly, Edited March 29, 2014 by turboloon Quote Link to post Share on other sites
mr_K Posted March 29, 2014 Author Share Posted March 29, 2014 i'm running 1.4mm hg on my forged build,and i find that a bit laggy (i also run dished pistons..)...and yes yer engine will cope with 300 bhp as long as it's built and maintained correctly, so a 1.9mm will be too thick and engine will be laggy? i dont know if i should use a 1.4mm because im gona have to skim the head and deck the block. because of the high comp pistons im abit worried. Quote Link to post Share on other sites
richardc9052 Posted March 29, 2014 Share Posted March 29, 2014 There are a few different compression calculators online you could use. Use the different gasket thicknesses and you will soon see which one you need.. Quote Link to post Share on other sites
mr_K Posted March 29, 2014 Author Share Posted March 29, 2014 Ill have a look and try one out mate.Will that be accurate? Quote Link to post Share on other sites
turboloon Posted March 29, 2014 Share Posted March 29, 2014 sorry i never noticed you were running flat top pistons Quote Link to post Share on other sites
AdamB Posted April 2, 2014 Share Posted April 2, 2014 Measure the valve to piston clearence then you can pick a headgasket. Thinner the better but depends on whos mapping it really. Quote Link to post Share on other sites
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