trying to make a nasty mud motor out of 290 horse gm crate
11-25-2009, 12:46 PM
#1
Teching In
Thread Starter
Join Date: Dec 2008
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
trying to make a nasty mud motor out of 290 horse gm crate first of all this is going in a 68 chev. 3/4 ton. 37inch irok's, play and pull people out of mud and etc..
i looked the part # up on jegs for the motor. it is #809-10067353.
basically a low comp 350, but is 4 bolt and has decent rods. pistons are cast
this motor comes with 76cc heads and has 8.5;1. i need this at or above ~11:1. i will swap pistons if i need to as this is a brand new motor sitting in garage and will need no machining to swap. i will leave bottom end alone except i have arp rod bolts going in. should hold 6500 ok.
the cam i have investigated for me is http://www.compcams.com/Cam_Specs/Ca...?csid=236&sb=2
the power band will be small but i should get a hell of a torque curve out of the 106 ls. i do not care about drivability as this is a toy..
other parts already purchased
225cc patriot heads 64cc (i know big but going for max effort, and got a deal)
rpm airgap port matched to heads, 1 1/2" open spacer
1 3/4 3"collector headers, bullets
msd hei
6al
750 hp holley
truck has 4.56 gears and a truck trans. (sm420 for those who know, granny gear 4 speed)
any other recommendations??
please don't anyone tell me to get a vict. jr. this will not help this motor unless i spin 7000
if i shave my 64cc heads what can i get comp. to with the stock pistons...
will they live???
i looked the part # up on jegs for the motor. it is #809-10067353.
basically a low comp 350, but is 4 bolt and has decent rods. pistons are cast
this motor comes with 76cc heads and has 8.5;1. i need this at or above ~11:1. i will swap pistons if i need to as this is a brand new motor sitting in garage and will need no machining to swap. i will leave bottom end alone except i have arp rod bolts going in. should hold 6500 ok.
the cam i have investigated for me is http://www.compcams.com/Cam_Specs/Ca...?csid=236&sb=2
the power band will be small but i should get a hell of a torque curve out of the 106 ls. i do not care about drivability as this is a toy..
other parts already purchased
225cc patriot heads 64cc (i know big but going for max effort, and got a deal)
rpm airgap port matched to heads, 1 1/2" open spacer
1 3/4 3"collector headers, bullets
msd hei
6al
750 hp holley
truck has 4.56 gears and a truck trans. (sm420 for those who know, granny gear 4 speed)
any other recommendations??
please don't anyone tell me to get a vict. jr. this will not help this motor unless i spin 7000
if i shave my 64cc heads what can i get comp. to with the stock pistons...
will they live???
11-25-2009, 02:44 PM
#2
TECH Resident
Join Date: Oct 2005
Location: Champaign IL
Posts: 814
Likes: 0
Received 0 Likes
on
0 Posts
when compression is actually calculated on that engine, its comes out to a more accurate 7.8:1. Pistons will have to be changed and the block zero decked unless you just use a .250" dome.
