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picked up a new motor.. 331 stroker

Kyle.malone

Bronco Guru
Joined
Mar 9, 2006
Messages
3,077
Loc.
Norman, OK
OK heres the lowdown:

91 block. built 331 stroker - 8.5:1 compression, eagle crank 4340. Eagle H beam rods, JE pistons, Moly rings (gapped for nitrous but wont use) celvite main/rod bearings, ported edelbrock victor jr air gap, new timing chain set, high volume oil pump, felpro mls gaskets, aftermarket balancer, ARP bolts used for everything, 1.6 roller rockers, ported world products heads, aluminum valve cover, CSR polished electric water pump, and Canton 7 qt oil pan.

1st thing to be changed will be the valve covers, oil pan, and the water pump. This motor is a fresh rebuild with 0 miles on it. I picked it up for $2100. I'm gonna remove the timing cover to find out the cam in the motor but it is matched to the motor. I can't wait to get this thing in. I will be putting on a 750cfm Demon card with extensions in the jets for offroading.. ;D

My 71 block that I had completly rebuilt with all new everything except for the crank and rods will be up for sale soon. Its' funny howe I have more in the rebuild than the buy cause someone got bored.
 

Ourobos

Bronco Guru
Joined
Jan 7, 2008
Messages
1,225
Loc.
Big Island Hawaii
Steel internals are kinda pointless with the late model roller block, it's the weak link, but still good to 400hp + regardless.. Also the 8.5:1 is on the low side for N/A or even nitrous for that matter, you'd think they built that for forced induction.. Anyways, great deal, I've ran many 302 strokers, made 678 hp with my last 336 and a S-trim..
 

broncnaz

Bronco Guru
Joined
May 22, 2003
Messages
24,341
Yeah I'd want a little more compression as well. Most nitrous engine builders bump the compression down 1-2 points from what a normal built engine would run. Most likey the cam thats in it will be to big for bronco useage as well. A smaller more suitible cam will also help with the lower compression. I'd also stick with a 600 cfm carb you'll have better throttle response with it than that 750. The 750 would be fine if you had a light weight vehicle and were planning on turning 8000 RPM all the time. but a street/offroad vehcile will be better off with the smaller carb.
 
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